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<div class="moz-cite-prefix">Hi All,<br>
<br>
I have test the same example under Ubuntu12.04 X64. The PETSc-dev
version is update to date (GIT Date: 2013-11-01 14:59:20 -0500)
and the installation is smooth without any error. The speedup of
MPI version is linear scalable but the speedup of OpenMP version
does not change. <b><font color="#ff0000">From the CPU usage,
the program still run in one thread when use OpenMP. </font></b><br>
<br>
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<![endif]-->The commands to run the test are as follows:<br>
<br>
openmp<br>
./ex2f -threadcomm_type openmp -threadcomm_nthreads 4 -m 1000 -n
1000 -log_summary log_ex2f_1000x1000_ubuntu1204_omp_p4.log<br>
<br>
mpi<br>
mpiexec -n 4 ./ex2f -m 1000 -n 1000 -log_summary
log_ex2f_1000x1000_ubuntu1204_mpi_p4.log<br>
<br>
This problem is so tricky to me. Can anybody confirm if KSP solver
is parallelized for OpenMP version?<br>
<br>
Thanks and regards,<br>
<br>
Danyang<br>
<br>
On 31/10/2013 4:54 PM, Danyang Su wrote:<br>
</div>
<blockquote cite="mid:5272EDAD.2070001@gmail.com" type="cite">Hi
All,
<br>
<br>
I have a question on the speedup of PETSc when using OpenMP. I can
get good speedup when using MPI, but no speedup when using OpenMP.
<br>
The example is ex2f with m=100 and n=100. The number of available
processors is 16 (32 threads) and the OS is Windows Server 2012.
The log files for 4 and 8 processors are attached.
<br>
<br>
The commands I used to run with 4 processors are as follows:
<br>
Run using MPI
<br>
mpiexec -n 4 Petsc-windows-ex2f.exe -m 100 -n 100 -log_summary
log_100x100_mpi_p4.log
<br>
<br>
Run using OpenMP
<br>
Petsc-windows-ex2f.exe -threadcomm_type openmp
-threadcomm_nthreads 4 -m 100 -n 100 -log_summary
log_100x100_openmp_p4.log
<br>
<br>
The PETSc used for this test is PETSc for Windows
<a class="moz-txt-link-freetext" href="http://www.mic-tc.ch/downloads/PETScForWindows.zip">http://www.mic-tc.ch/downloads/PETScForWindows.zip</a>, but I guess
this is not the problem because the same problem exists when I use
PETSc-dev in Cygwin. I don't know if this problem exists in Linux,
would anybody help to test?
<br>
<br>
Thanks and regards,
<br>
<br>
Danyang
<br>
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