<div dir="ltr"><div dir="ltr">On Tue, May 9, 2023 at 7:17 AM Jose E. Roman <<a href="mailto:jroman@dsic.upv.es">jroman@dsic.upv.es</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi.<br>
<br>
We are seeing a strange thing in the -log_view output with one of the SLEPc solvers. It is probably an issue with SLEPc, but we don't know how to debug it.<br>
<br>
It can be reproduced for instance with<br>
<br>
$ ./ex45 -m 15 -n 20 -p 21 -svd_nsv 4 -svd_ncv 9 -log_view<br>
<br>
The log_view events are listed at the end of this email. The first one (PetscBarrier) is wrong, because PetscBarrier is never called, if I place a breakpoint in PetscBarrier() it will never be hit. Also, in that event it reports some nonzero Mflop/s, which suggests that it corresponds to another event (not PetscBarrier). Furthermore, the count of the PetscBarrier event always matches the count of MatMultTranspose, so there must be a connection.<br>
<br>
Does anyone have suggestions how to address this?<br></blockquote><div><br></div><div>Hi Jose,</div><div><br></div><div>Here is my guess. PETSc sets all of the event ids (using Register) when the dynamic libraries get loaded. If they are not loaded,</div><div>then the library initialization function is called when some function from that library is used. My guess is that we put this init check</div><div>in MatCreate(), but that is not called when you create your shell matrix and thus the events are not initialized correctly for you until</div><div>later. Can you check?</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Note: this is with 1 MPI process.<br>
Note: the solver creates a shell matrix with MATOP_MULT_TRANSPOSE.<br>
<br>
Thanks.<br>
Jose<br>
<br>
<br>
PetscBarrier 16 1.0 7.5579e-04 1.0 4.38e+03 1.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 6<br>
MatMult 82 1.0 6.1590e-01 1.0 9.25e+05 1.0 0.0e+00 0.0e+00 0.0e+00 81 97 0 0 0 81 97 0 0 0 2<br>
MatMultTranspose 16 1.0 7.4625e-04 1.0 4.38e+03 1.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 6<br>
MatAssemblyBegin 4 1.0 5.2452e-06 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
MatAssemblyEnd 4 1.0 2.8920e-04 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
MatTranspose 2 1.0 1.6265e-03 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
SVDSetUp 1 1.0 1.8686e-02 1.0 2.72e+02 1.0 0.0e+00 0.0e+00 0.0e+00 2 0 0 0 0 2 0 0 0 0 0<br>
SVDSolve 1 1.0 5.5965e-01 1.0 7.95e+05 1.0 0.0e+00 0.0e+00 0.0e+00 74 83 0 0 0 74 83 0 0 0 1<br>
EPSSetUp 1 1.0 9.5146e-03 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<br>
EPSSolve 1 1.0 5.4082e-01 1.0 7.94e+05 1.0 0.0e+00 0.0e+00 0.0e+00 71 83 0 0 0 71 83 0 0 0 1<br>
STSetUp 1 1.0 4.8406e-03 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<br>
STComputeOperatr 1 1.0 1.2653e-03 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
STApply 24 1.0 6.1569e-01 1.0 8.84e+05 1.0 0.0e+00 0.0e+00 0.0e+00 81 92 0 0 0 81 92 0 0 0 1<br>
STMatSolve 24 1.0 6.1556e-01 1.0 8.80e+05 1.0 0.0e+00 0.0e+00 0.0e+00 81 92 0 0 0 81 92 0 0 0 1<br>
KSPSetUp 1 1.0 2.8465e-03 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
KSPSolve 24 1.0 6.1551e-01 1.0 8.80e+05 1.0 0.0e+00 0.0e+00 0.0e+00 81 92 0 0 0 81 92 0 0 0 1<br>
KSPGMRESOrthog 480 1.0 4.3219e-01 1.0 3.98e+05 1.0 0.0e+00 0.0e+00 0.0e+00 57 42 0 0 0 57 42 0 0 0 1<br>
PCSetUp 1 1.0 3.8147e-06 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
PCApply 504 1.0 2.1615e-02 1.0 1.01e+04 1.0 0.0e+00 0.0e+00 0.0e+00 3 1 0 0 0 3 1 0 0 0 0<br>
BVCopy 27 1.0 3.0560e-03 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
BVMultVec 38 1.0 3.7060e-03 1.0 8.88e+03 1.0 0.0e+00 0.0e+00 0.0e+00 0 1 0 0 0 0 1 0 0 0 2<br>
BVMultInPlace 3 1.0 1.0681e-04 1.0 4.32e+03 1.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 40<br>
BVDotVec 38 1.0 4.5121e-03 1.0 4.38e+04 1.0 0.0e+00 0.0e+00 0.0e+00 1 5 0 0 0 1 5 0 0 0 10<br>
BVOrthogonalizeV 20 1.0 1.3182e-02 1.0 5.33e+04 1.0 0.0e+00 0.0e+00 0.0e+00 2 6 0 0 0 2 6 0 0 0 4<br>
BVScale 24 1.0 4.8089e-04 1.0 4.80e+02 1.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 1<br>
BVNormVec 4 1.0 5.4097e-04 1.0 3.67e+03 1.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 7<br>
BVNormalize 1 1.0 1.3154e-03 1.0 3.75e+03 1.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 3<br>
BVSetRandom 1 1.0 9.1791e-05 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
BVMatMultVec 19 1.0 4.6828e-01 1.0 6.99e+05 1.0 0.0e+00 0.0e+00 0.0e+00 62 73 0 0 0 62 73 0 0 0 1<br>
DSSolve 3 1.0 8.8906e-04 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
DSVectors 7 1.0 2.8920e-04 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
DSOther 12 1.0 3.8576e-04 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
VecDot 4 1.0 8.7500e-05 1.0 1.56e+02 1.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 2<br>
VecMDot 488 1.0 6.0463e-04 1.0 1.98e+05 1.0 0.0e+00 0.0e+00 0.0e+00 0 21 0 0 0 0 21 0 0 0 327<br>
VecNorm 520 1.0 1.0412e-02 1.0 2.02e+04 1.0 0.0e+00 0.0e+00 0.0e+00 1 2 0 0 0 1 2 0 0 0 2<br>
VecScale 514 1.0 1.0245e-02 1.0 1.03e+04 1.0 0.0e+00 0.0e+00 0.0e+00 1 1 0 0 0 1 1 0 0 0 1<br>
VecCopy 62 1.0 1.8365e-03 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
VecSet 64 1.0 4.2200e-05 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
VecAXPY 32 1.0 4.8995e-04 1.0 1.44e+03 1.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 3<br>
VecMAXPY 504 1.0 6.9070e-04 1.0 2.21e+05 1.0 0.0e+00 0.0e+00 0.0e+00 0 23 0 0 0 0 23 0 0 0 320<br>
VecPointwiseMult 504 1.0 3.3593e-04 1.0 1.01e+04 1.0 0.0e+00 0.0e+00 0.0e+00 0 1 0 0 0 0 1 0 0 0 30<br>
VecSetRandom 1 1.0 5.0068e-06 1.0 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00 0 0 0 0 0 0 0 0 0 0 0<br>
VecNormalize 512 1.0 4.1106e-02 1.0 3.01e+04 1.0 0.0e+00 0.0e+00 0.0e+00 5 3 0 0 0 5 3 0 0 0 1<br>
<br>
</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>