<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><br class=""></div> The MatSolve is no better on the GPUs then on the CPU; while other parts of the computation seem to speed up nicely. What is the result of -ksp_view ? Are you using ILU(0) as the preconditioner, this will not solve well on the GPU, its solve is essentially sequential. You won't want to use ILU(0) in this way on GPUs.<div class=""><br class=""></div><div class=""> Barry</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Sep 30, 2021, at 9:41 AM, Karthikeyan Chockalingam - STFC UKRI <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" class="">karthikeyan.chockalingam@stfc.ac.uk</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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<div class="WordSection1"><p class="MsoNormal"><span style="mso-fareast-language:EN-US" class="">Based on your feedback from yesterday. I was trying to breakdown KSPSolve.<o:p class=""></o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-US" class="">Please find the attached bar plot. The numbers are not adding up at least for GPUs.<o:p class=""></o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-US" class="">Your feedback from yesterday were based on T%.
<o:p class=""></o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-US" class="">I plotted the time spend on each event, hoping that the cumulative sum would add up to KSPSolve time.<o:p class=""></o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-US" class=""><o:p class=""> </o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-US" class="">Kind regards,<o:p class=""></o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-US" class="">Karthik.<o:p class=""></o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-US" class=""><o:p class=""> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm" class=""><p class="MsoNormal"><b class=""><span style="font-size: 12pt;" class="">From: </span></b><span style="font-size: 12pt;" class="">Matthew Knepley <<a href="mailto:knepley@gmail.com" class="">knepley@gmail.com</a>><br class="">
<b class="">Date: </b>Thursday, 30 September 2021 at 13:52<br class="">
<b class="">To: </b>"Chockalingam, Karthikeyan (STFC,DL,HC)" <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" class="">karthikeyan.chockalingam@stfc.ac.uk</a>><br class="">
<b class="">Cc: </b>Barry Smith <<a href="mailto:bsmith@petsc.dev" class="">bsmith@petsc.dev</a>>, "<a href="mailto:petsc-users@mcs.anl.gov" class="">petsc-users@mcs.anl.gov</a>" <<a href="mailto:petsc-users@mcs.anl.gov" class="">petsc-users@mcs.anl.gov</a>><br class="">
<b class="">Subject: </b>Re: [petsc-users] (percent time in this phase)<o:p class=""></o:p></span></p>
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<div class=""><p class="MsoNormal"><o:p class=""> </o:p></p>
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<div class="">
<div class=""><p class="MsoNormal">On Thu, Sep 30, 2021 at 8:50 AM Karthikeyan Chockalingam - STFC UKRI <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" class="">karthikeyan.chockalingam@stfc.ac.uk</a>> wrote:<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">When comparing the MatSolve data for
<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">GPU<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">MatSolve 341 1.0 1.3009e+02 1.6 2.96e+11 1.0 0.0e+00 0.0e+00 0.0e+00 36 34 0 0 0 36 34 0 0 0 4536 4538 1 5.34e+02 0 0.00e+00 100<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">MatCUSPARSSolAnl 2 1.0 3.2338e+01 1.5 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 9 0 0 0 0 9 0 0 0 0 0 0 0 0.00e+00 0 0.00e+00 0<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">and CPU<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">MatSolve 352 1.0 1.3553e+02 1.0 1.02e+11 1.0 0.0e+00 0.0e+00 0.0e+00 35 34 0 0 0 35 34 0 0 0 4489<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">the time spent is almost the same for this preconditioner. Look like MatCUSPARSSolAnl is called only
<u class="">twice</u> (since I am running on two cores) <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="" class="">mpirun -n 2 ./ex45 -log_summary -da_grid_x 511 -da_grid_y 511 -da_grid_z 511 -dm_mat_type mpiaijcusparse -dm_vec_type mpicuda -ksp_type cg -pc_type bjacobi
-ksp_monitor</span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">So would it be fair to assume MatCUSPARSSolAnl is
<u class="">not </u>accounted for in MatSolve and it is an exclusive event?<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal"><o:p class=""> </o:p></p>
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<div class=""><p class="MsoNormal">Looks like that.<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal"><o:p class=""> </o:p></p>
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<div class=""><p class="MsoNormal"> Thanks<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal"><o:p class=""> </o:p></p>
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<div class=""><p class="MsoNormal"> Matt<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">KSPSolve (53%) + PCSetup (16%) + DMCreateMat (23%) + MatCUSPARSSolAnl (9%) ~ 100 %<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Best,<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Karthik.<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm" class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b class=""><span style="font-size: 12pt;" class="">From:
</span></b><span style="font-size: 12pt;" class="">Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank" class="">knepley@gmail.com</a>><br class="">
<b class="">Date: </b>Wednesday, 29 September 2021 at 16:29<br class="">
<b class="">To: </b>"Chockalingam, Karthikeyan (STFC,DL,HC)" <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" target="_blank" class="">karthikeyan.chockalingam@stfc.ac.uk</a>><br class="">
<b class="">Cc: </b>Barry Smith <<a href="mailto:bsmith@petsc.dev" target="_blank" class="">bsmith@petsc.dev</a>>, "<a href="mailto:petsc-users@mcs.anl.gov" target="_blank" class="">petsc-users@mcs.anl.gov</a>" <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank" class="">petsc-users@mcs.anl.gov</a>><br class="">
<b class="">Subject: </b>Re: [petsc-users] %T (percent time in this phase)</span><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class="">
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Wed, Sep 29, 2021 at 10:18 AM Karthikeyan Chockalingam - STFC UKRI <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" target="_blank" class="">karthikeyan.chockalingam@stfc.ac.uk</a>>
wrote:<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thank you!
<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Just to summarize
<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">KSPSolve (53%) + PCSetup (16%) + DMCreateMat (23%) + MatCUSPARSSolAnl (9%) ~ 100 %<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">You didn’t happen to mention how MatCUSPARSSolAnl is accounted for? Am I right in accounting for it as above?<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I am not sure.I thought it might be the GPU part of MatSolve(). I will have to look in the code. I am not as familiar with the GPU part.<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">MatCUSPARSSolAnl 2 1.0 3.2338e+01 1.5 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 9 0 0 0 0 9 0 0 0 0 0 0 0 0.00e+00 0 0.00e+00 0<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Finally, I believe the vector events, VecNorn, VecTDot, VecAXPY, and VecAYPX are mutually exclusive?<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Yes.<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Thanks,<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Matt<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class="">
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Best,<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Karthik.<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm" class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b class=""><span style="font-size: 12pt;" class="">From:
</span></b><span style="font-size: 12pt;" class="">Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank" class="">knepley@gmail.com</a>><br class="">
<b class="">Date: </b>Wednesday, 29 September 2021 at 11:58<br class="">
<b class="">To: </b>"Chockalingam, Karthikeyan (STFC,DL,HC)" <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" target="_blank" class="">karthikeyan.chockalingam@stfc.ac.uk</a>><br class="">
<b class="">Cc: </b>Barry Smith <<a href="mailto:bsmith@petsc.dev" target="_blank" class="">bsmith@petsc.dev</a>>, "<a href="mailto:petsc-users@mcs.anl.gov" target="_blank" class="">petsc-users@mcs.anl.gov</a>" <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank" class="">petsc-users@mcs.anl.gov</a>><br class="">
<b class="">Subject: </b>Re: [petsc-users] %T (percent time in this phase)</span><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Wed, Sep 29, 2021 at 6:24 AM Karthikeyan Chockalingam - STFC UKRI <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" target="_blank" class="">karthikeyan.chockalingam@stfc.ac.uk</a>>
wrote:<o:p class=""></o:p></p>
</div>
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<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt" class="">
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thank you Mathew. Now, it is all making sense to me.<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">From data file ksp_ex45_N511_gpu_2.txt
<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">KSPSolve (53%) + KSPSetup (0%) = PCSetup (16%) + PCApply (37%).<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">However, you said “So an iteration would mostly consist of MatMult + PCApply, with some vector work”<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">1) You do one solve, but 2 KSPSetUp()s. You must be running on more than one process and using Block-Jacobi . Half the time is spent in the solve (53%)<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<pre style="white-space:pre-wrap" class=""><span style="font-size: 10.5pt;" class="">KSPSetUp 2 1.0 5.3149e-01 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 2.4e+01 0 0 0 0 1 0 0 0 0 1 0 0 0 0.00e+00 0 0.00e+00 0</span><o:p class=""></o:p></pre>
<pre class=""><span style="font-size: 10.5pt;" class="">KSPSolve 1 1.0 1.5837e+02 1.1 8.63e+11 1.0 6.8e+02 2.1e+06 4.4e+03 53100100100 95 53100100100 96 10881 11730 1022 6.40e+03 1021 8.17e-03 100</span><o:p class=""></o:p></pre>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"> <o:p class=""></o:p></p>
</div><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">2) The preconditioner look like BJacobi-ILU. The setup time is 16%, which is all setup of the individual blocks, and this is all used by the numerical ILU factorization.<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 10.5pt; font-family: "Courier New";" class="">PCSetUp 2 1.0 4.9623e+01 1.3 1.45e+09 1.0 0.0e+00 0.0e+00 0.0e+00 16 0 0 0 0 16 0 0 0 0 58 0 2 6.93e+03 0 0.00e+00
0 PCSetUpOnBlocks 1 1.0 4.9274e+01 1.3 1.45e+09 1.0 0.0e+00 0.0e+00 0.0e+00 15 0 0 0 0 15 0 0 0 0 59 0 2 6.93e+03 0 0.00e+00 0
</span><o:p class=""></o:p></p>
<pre class=""><span style="font-size: 10.5pt;" class="">MatLUFactorNum 1 1.0 4.6126e+01 1.3 1.45e+09 1.0 0.0e+00 0.0e+00 0.0e+00 14 0 0 0 0 14 0 0 0 0 63 0 2 6.93e+03 0 0.00e+00 0</span><o:p class=""></o:p></pre>
<pre class=""><span style="font-size: 10.5pt;" class="">MatILUFactorSym 1 1.0 2.5110e+00 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 1 0 0 0 0 1 0 0 0 0 0 0 0 0.00e+00 0 0.00e+00 0</span><o:p class=""></o:p></pre>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">3) The preconditioner application takes 37% of the time, which is all solving the factors and recorded in MatSolve(). Matrix multiplication takes 4%.<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 10.5pt; font-family: "Courier New";" class="">PCApply 341 1.0 1.3068e+02 1.6 2.96e+11 1.0 0.0e+00 0.0e+00 0.0e+00 37 34 0 0 0 37 34 0 0 0 4516 4523 1 5.34e+02
0 0.00e+00 100</span><o:p class=""></o:p></p>
</div>
<pre style="white-space:pre-wrap" class=""><span style="font-size: 10.5pt;" class="">MatSolve 341 1.0 1.3009e+02 1.6 2.96e+11 1.0 0.0e+00 0.0e+00 0.0e+00 36 34 0 0 0 36 34 0 0 0 4536 4538 1 5.34e+02 0 0.00e+00 100</span><o:p class=""></o:p></pre>
<pre style="white-space:pre-wrap" class=""><span style="font-size: 10.5pt;" class="">MatMult 341 1.0 1.0774e+01 1.1 2.96e+11 1.0 6.9e+02 2.1e+06 2.0e+00 4 34100100 0 4 34100100 0 54801 66441 2 5.86e+03 0 0.00e+00 100</span><o:p class=""></o:p></pre>
<pre class=""><span style="font-size: 10.5pt;" class=""> </span><o:p class=""></o:p></pre><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">4) The significant vector time is all in norms (11%) since they are really slow on the GPU.<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"> <o:p class=""></o:p></p>
<pre class=""><span style="font-size: 10.5pt;" class="">VecNorm 342 1.0 6.2261e+01129.9 4.57e+10 1.0 0.0e+00 0.0e+00 6.8e+02 11 5 0 0 15 11 5 0 0 15 1466 196884 0 0.00e+00 342 2.74e-03 100</span><o:p class=""></o:p></pre>
<pre style="white-space:pre-wrap" class=""><span style="font-size: 10.5pt;" class="">VecTDot 680 1.0 1.7107e+00 1.3 9.09e+10 1.0 0.0e+00 0.0e+00 1.4e+03 1 10 0 0 29 1 10 0 0 29 106079 133922 0 0.00e+00 680 5.44e-03 100</span><o:p class=""></o:p></pre>
<pre class=""><span style="font-size: 10.5pt;" class="">VecAXPY 681 1.0 3.2036e+00 1.7 9.10e+10 1.0 0.0e+00 0.0e+00 0.0e+00 1 11 0 0 0 1 11 0 0 0 56728 58367 682 5.34e+02 0 0.00e+00 100</span><o:p class=""></o:p></pre>
<pre class=""><span style="font-size: 10.5pt;" class="">VecAYPX 339 1.0 2.6502e+00 1.8 4.53e+10 1.0 0.0e+00 0.0e+00 0.0e+00 1 5 0 0 0 1 5 0 0 0 34136 34153 339 2.71e-03 0 0.00e+00 100</span><o:p class=""></o:p></pre>
<pre style="white-space:pre-wrap" class=""><span style="font-size: 10.5pt;" class=""> </span><o:p class=""></o:p></pre><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">So the solve time is:<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> 53% ~ 37% + 4% + 11%<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">and the setup time is about 16%. I was wrong about the SetUp time being included, as it is outside the event:<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <a href="https://gitlab.com/petsc/petsc/-/blob/main/src/ksp/ksp/interface/itfunc.c#L852" target="_blank" class="">https://gitlab.com/petsc/petsc/-/blob/main/src/ksp/ksp/interface/itfunc.c#L852</a><o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">It looks like the remainder of the time (23%) is spent preallocating the matrix.<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Thanks,<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Matt<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt" class="">
<div class="">
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The MalMult event is 4 %. How does this event figure into the above equation; if preconditioning (MatMult + PCApply) is included in KSPSolve?<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Best,<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Karthik.<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm" class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b class=""><span style="font-size: 12pt;" class="">From:
</span></b><span style="font-size: 12pt;" class="">Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank" class="">knepley@gmail.com</a>><br class="">
<b class="">Date: </b>Wednesday, 29 September 2021 at 10:58<br class="">
<b class="">To: </b>"Chockalingam, Karthikeyan (STFC,DL,HC)" <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" target="_blank" class="">karthikeyan.chockalingam@stfc.ac.uk</a>><br class="">
<b class="">Cc: </b>Barry Smith <<a href="mailto:bsmith@petsc.dev" target="_blank" class="">bsmith@petsc.dev</a>>, "<a href="mailto:petsc-users@mcs.anl.gov" target="_blank" class="">petsc-users@mcs.anl.gov</a>" <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank" class="">petsc-users@mcs.anl.gov</a>><br class="">
<b class="">Subject: </b>Re: [petsc-users] %T (percent time in this phase)</span><o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class="">
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Wed, Sep 29, 2021 at 5:52 AM Karthikeyan Chockalingam - STFC UKRI <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" target="_blank" class="">karthikeyan.chockalingam@stfc.ac.uk</a>>
wrote:<o:p class=""></o:p></p>
</div>
<div class="">
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt" class="">
<div class="">
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">That was helpful. I would like to provide some additional details of my run on cpus and gpus. Please find the following attachments:<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
<ol start="1" type="1" class="">
<li class="gmail-m-2472759815423112172gmail-m-3492767196240074348gmail-m391186430279648065gmail-m-3409338445930824232msolistparagraph" style="mso-list:l0 level1 lfo1">
graph.pdf a plot showing overall time and various petsc events.<o:p class=""></o:p></li><li class="gmail-m-2472759815423112172gmail-m-3492767196240074348gmail-m391186430279648065gmail-m-3409338445930824232msolistparagraph" style="mso-list:l0 level1 lfo1">
ksp_ex45_N511_cpu_6.txt data file of the log_summary <o:p class=""></o:p></li><li class="gmail-m-2472759815423112172gmail-m-3492767196240074348gmail-m391186430279648065gmail-m-3409338445930824232msolistparagraph" style="mso-list:l0 level1 lfo1">
ksp_ex45_N511_gpu_2.txt data file of the log_summary <o:p class=""></o:p></li></ol><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I used the following petsc options for cpu<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="" class=""> </span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="" class="">mpirun -n 6 ./ex45 -log_summary -da_grid_x 511 -da_grid_y 511 -da_grid_z 511 -dm_mat_type mpiaij -dm_vec_type mpi -ksp_type cg -pc_type bjacobi -ksp_monitor</span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="" class=""> </span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="" class="">and for gpus</span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="" class=""> </span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="" class="">mpirun -n 1 ./ex45 -log_summary -da_grid_x 511 -da_grid_y 511 -da_grid_z 511 -dm_mat_type mpiaijcusparse -dm_vec_type mpicuda -ksp_type cg -pc_type bjacobi
-ksp_monitor</span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="" class=""> </span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="" class="">to run the following problem</span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="" class=""> </span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class=""><a href="https://petsc.org/release/src/ksp/ksp/tutorials/ex45.c.html" target="_blank" class="">https://petsc.org/release/src/ksp/ksp/tutorials/ex45.c.html</a></span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class=""> </span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class="">From the above code, I see is there no individual function called
</span>KSPSetUp(), so I gather KSPSetDM, KSPSetComputeInitialGuess, KSPSetComputeRHS, kSPSetComputeOperators all are timed together as KSPSetUp.<span style="font-size: 12pt;" class=""> For this example, is KSPSetUp time and KSPSolve time mutually exclusive?</span><o:p class=""></o:p></p>
</div>
</div>
</blockquote>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">No, KSPSetUp() will be contained in KSPSolve() if it is called automatically.<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt" class="">
<div class="">
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class="">In your response you said that</span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class=""> </span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> “PCSetUp() time may be in KSPSetUp() or it maybe in PCApply() it depends on how much of the preconditioner construction can take place early, so depends exactly on the preconditioner
used.”<o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class=""> </span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class="">I don’t see a explicit call to PCSetUp() or PCApply() in ex45; so for this particular preconditioner (bjacobi) how can I tell how they
are timed?</span><o:p class=""></o:p></p>
</div>
</div>
</blockquote>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">They are all inside KSPSolve(). If you have a preconditioned linear solve, the oreconditioning happens during the iteration. So an iteration would mostly<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">consist of MatMult + PCApply, with some vector work.<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt" class="">
<div class="">
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class="">I am hoping to time KSP solving and preconditioning mutually exclusively.</span><o:p class=""></o:p></p>
</div>
</div>
</blockquote>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I am not sure that concept makes sense here. See above.<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Thanks,<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Matt<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt" class="">
<div class="">
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class=""> </span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class="">Kind regards,</span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class="">Karthik.</span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size: 12pt;" class=""> </span><o:p class=""></o:p></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm" class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b class=""><span style="font-size: 12pt;" class="">From:
</span></b><span style="font-size: 12pt;" class="">Barry Smith <<a href="mailto:bsmith@petsc.dev" target="_blank" class="">bsmith@petsc.dev</a>><br class="">
<b class="">Date: </b>Tuesday, 28 September 2021 at 19:19<br class="">
<b class="">To: </b>"Chockalingam, Karthikeyan (STFC,DL,HC)" <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" target="_blank" class="">karthikeyan.chockalingam@stfc.ac.uk</a>><br class="">
<b class="">Cc: </b>"<a href="mailto:petsc-users@mcs.anl.gov" target="_blank" class="">petsc-users@mcs.anl.gov</a>" <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank" class="">petsc-users@mcs.anl.gov</a>><br class="">
<b class="">Subject: </b>Re: [petsc-users] %T (percent time in this phase)</span><o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"> <o:p class=""></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt" class="">
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Sep 28, 2021, at 12:11 PM, Karthikeyan Chockalingam - STFC UKRI <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" target="_blank" class="">karthikeyan.chockalingam@stfc.ac.uk</a>>
wrote:<o:p class=""></o:p></p>
</div><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
<div class="">
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks for Barry for your response.<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I was just benchmarking the problem with various preconditioner on cpu and gpu. I understand, it is not possible to get mutually exclusive timing.<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">However, can you tell if KSPSolve time includes both PCSetup and PCApply? And if KSPSolve and KSPSetup are mutually exclusive? Likewise for PCSetUp and PCApply.<o:p class=""></o:p></p>
</div>
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</blockquote>
<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
</div><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> If you do not call KSPSetUp() separately from KSPSolve() then its time is included with KSPSolve().<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> PCSetUp() time may be in KSPSetUp() or it maybe in PCApply() it depends on how much of the preconditioner construction can take place early, so depends exactly on the preconditioner
used.<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> So yes the answer is not totally satisfying. The one thing I would recommend is to not call KSPSetUp() directly and then KSPSolve() will always include the total time of the
solve plus all setup time. PCApply will contain all the time to apply the preconditioner but may also include some setup time.<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Barry<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Best,<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Karthik.<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b class=""><span style="font-size:12.0pt" class="">From:<span class="gmail-m-2472759815423112172gmail-m-3492767196240074348gmail-m391186430279648065gmail-m-3409338445930824232apple-converted-space"> </span></span></b><span style="font-size:12.0pt" class="">Barry
Smith <<a href="mailto:bsmith@petsc.dev" target="_blank" class="">bsmith@petsc.dev</a>><br class="">
<b class="">Date:<span class="gmail-m-2472759815423112172gmail-m-3492767196240074348gmail-m391186430279648065gmail-m-3409338445930824232apple-converted-space"> </span></b>Tuesday, 28 September 2021 at 16:56<br class="">
<b class="">To:<span class="gmail-m-2472759815423112172gmail-m-3492767196240074348gmail-m391186430279648065gmail-m-3409338445930824232apple-converted-space"> </span></b>"Chockalingam, Karthikeyan (STFC,DL,HC)" <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" target="_blank" class="">karthikeyan.chockalingam@stfc.ac.uk</a>><br class="">
<b class="">Cc:<span class="gmail-m-2472759815423112172gmail-m-3492767196240074348gmail-m391186430279648065gmail-m-3409338445930824232apple-converted-space"> </span></b>"<a href="mailto:petsc-users@mcs.anl.gov" target="_blank" class="">petsc-users@mcs.anl.gov</a>" <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank" class="">petsc-users@mcs.anl.gov</a>><br class="">
<b class="">Subject:<span class="gmail-m-2472759815423112172gmail-m-3492767196240074348gmail-m391186430279648065gmail-m-3409338445930824232apple-converted-space"> </span></b>Re: [petsc-users] %T (percent time in this phase)</span><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Sep 28, 2021, at 10:55 AM, Karthikeyan Chockalingam - STFC UKRI <<a href="mailto:karthikeyan.chockalingam@stfc.ac.uk" target="_blank" class="">karthikeyan.chockalingam@stfc.ac.uk</a>>
wrote:<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt" class="">Hello,</span><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt" class=""> </span><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt" class="">I ran ex45 in the KPS tutorial, which is a 3D finite-difference Poisson problem. I noticed from the output from using the flag -log_summary that for
various events their respective %T (percent time in this phase) do not add up to 100 but rather exceeds 100. So, I gather there is some overlap among these events. I am primarily looking at the events KSPSetUp, KSPSolve, PCSetUp and PCSolve. Is it possible
to get a mutually exclusive %T or Time for these individual events? I have attached the log_summary output file from my run for your reference.</span><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt" class=""> </span><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> For nested solvers it is tricky to get the times to be mutually exclusive because some parts of the building of the preconditioner is for some preconditioners delayed until the
solve has started. <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> It looks like you are using the default preconditioner options which for this example are taking more or less no time since so many iterations are needed. It is best to use -pc_type
mg to use geometric multigrid on this problem.<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> Barry<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt" class="">Thanks!</span><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt" class="">Karthik.</span><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:6.0pt;font-family:Helvetica" class="">This email and any attachments are intended solely for the use of the named recipients. If you are not the intended recipient
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><ksp_ex45_N511_cpu_6.txt><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br class="">
-- Norbert Wiener<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank" class="">https://www.cse.buffalo.edu/~knepley/</a><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br class="">
-- Norbert Wiener<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank" class="">https://www.cse.buffalo.edu/~knepley/</a><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br class="">
-- Norbert Wiener<o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank" class="">https://www.cse.buffalo.edu/~knepley/</a><o:p class=""></o:p></p>
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<div class=""><p class="MsoNormal">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br class="">
-- Norbert Wiener<o:p class=""></o:p></p>
</div>
<div class=""><p class="MsoNormal"><o:p class=""> </o:p></p>
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<div class=""><p class="MsoNormal"><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank" class="">https://www.cse.buffalo.edu/~knepley/</a><o:p class=""></o:p></p>
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<span id="cid:75CD6B88A04F4646B247A5E1678DD6A0@GBRP265.PROD.OUTLOOK.COM"><KSPSolve.pdf></span></div></blockquote></div><br class=""></div></body></html>