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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Yes, MKL_DYNAMIC was set to true. No, I haven't tested on
Nehalem. I'm currently comparing sequential MKL with --download-f-blas-lapack=1.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Rob<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> petsc-users-bounces@mcs.anl.gov
[mailto:petsc-users-bounces@mcs.anl.gov] <b>On Behalf Of </b>Natarajan CS<br>
<b>Sent:</b> Tuesday, March 15, 2011 3:20 PM<br>
<b>To:</b> PETSc users list<br>
<b>Cc:</b> Robert Ellis<br>
<b>Subject:</b> Re: [petsc-users] Building with MKL 10.3<o:p></o:p></span></p>
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<p class=MsoNormal>Thanks Eric and Rob.<br>
<br>
Indeed! Was MKL_DYNAMIC set to default (true)? It looks like using 1 thread per
core (sequential MKL) is the right thing to do as baseline.<br>
I would think that the performance of #cores = num_mpi_processes *
num_mkl_threads might be <= #cores = num_mpi_processes case (# cores const)
unless some cache effects come into play (Not sure what, I would think the mkl
installation should weed these issues out).<o:p></o:p></p>
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<br>
P.S :<br>
Out of curiosity have you also tested your app on Nehalem? Any difference
between Nehalem vs Westmere for similar bandwidth?<br>
<br>
On Tue, Mar 15, 2011 at 4:35 PM, Jed Brown <<a href="mailto:jed@59a2.org">jed@59a2.org</a>>
wrote:<o:p></o:p></p>
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<p class=MsoNormal>On Tue, Mar 15, 2011 at 22:30, Robert Ellis <<a
href="mailto:Robert.Ellis@geosoft.com" target="_blank">Robert.Ellis@geosoft.com</a>>
wrote:<o:p></o:p></p>
<p class=MsoNormal>Regardless of setting the number of threads for MKL or OMP,
the MKL performance was worse than simply using --download-f-blas-lapack=1.<o:p></o:p></p>
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<p class=MsoNormal>Interesting. Does this statement include using just one
thread, perhaps with a non-threaded MKL? Also, when you used threading, were
you putting an MPI process on every core or were you making sure that you had
enough cores for num_mpi_processes * num_mkl_threads?<o:p></o:p></p>
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