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November 25, 2010, 09:35 |
Help with parallel exec on Intel i7
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#1 |
New Member
Join Date: Nov 2010
Posts: 5
Rep Power: 16 |
Hello to everybody,
I'm a complete newbie with CFD and Star-CCM+. I'm trying to learn something on this software thru tutorials and examples. I have the following problem: when I start Star-CCM+ in parallel mode I get the following warning: Starting local server: starccm+ -server -np 2 Worker Node[2]@XXXX process 692 (MPICH2:nemesis) Master Node[0]@XXXX process 5460 (MPICH2:nemesis) STAR-CCM+ Version 4.04.011 (win64/intel10.1) Worker Node[1]@XXXX process 5404 (MPICH2:nemesis) Server::start XXXX:51786 Disabling parallel asynchronous communications. STAR-CCM+ will avoid using non-blocking communication. This may degrade the performance. My machine is a laptop with a intel-i7 Q720 (4 core - 8 threads), I use Windows 7 64 bit, and MPICH2 ver. 1.3. My question is: is there a way to configure MPICH2 or Star to use the parallel asynchronous comms? How much does this have an impact on performance? Thank you very much for your help. Regards |
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November 29, 2010, 15:25 |
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#2 |
Senior Member
Join Date: Apr 2009
Posts: 159
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It has a small but measurable effect. There's a checkbox in Tools>Options>Parallel> that you can change.
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November 29, 2010, 15:55 |
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#3 |
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Join Date: Nov 2010
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thank you very much! i will do some benchmarks.
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December 1, 2010, 09:58 |
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#4 |
New Member
Join Date: May 2010
Posts: 14
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What are the disadvantages of using the asynchronous?
cfdnewbie1, I would be interested on the bechmark times. If you can pst them when done that would be appreciated. fw |
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December 23, 2010, 08:27 |
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#5 |
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Join Date: Nov 2010
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Here the results of the benchmark done with the bluntbody.sim tutorial.
4 cpus Enabled Solution Accumulated CPU Time over all processes (s) 6007.063 Elapsed Time (s) 1506.699829 Iterations 1500 Disabled Solution Accumulated CPU Time over all processes (s) 6178.668 Elapsed Time (s) 1550.230431 Iterations 1500 |
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December 25, 2010, 05:34 |
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#6 |
New Member
filippo
Join Date: Mar 2009
Posts: 10
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hello, just a simple information: I'm trying to do the same on an i7, but star-ccm replies with "no MPI distribution found", even if I installed mpich2. How did you get it to work? I mean, first installed star, then mpich, etcc
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December 27, 2010, 11:07 |
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#7 |
New Member
Join Date: Nov 2010
Posts: 5
Rep Power: 16 |
You have to start the set the mpich process to start automatically.
try to google smpd.exe –install mpiexec.exe –register you can find all the info! Hi |
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intel i7, mpich2 |
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