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May 23, 2013, 00:47 |
FX8350 is terrible for OpenFOAM
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#1 |
New Member
Charlie Feng
Join Date: Dec 2012
Posts: 2
Rep Power: 0 |
I built a new computer specifically for OpenFoam.
I am using the new eight-core AMD FX 8350 processor, 16 gb GSkill ram, running at 90% of the L3 cache speed (fast!), and two hard drives in RAID1. I was expecting this computer to be extremely quick, but it is running identical simulations about 10x slower than the local i7 workstations at school. Could I have setup something incorrectly during installation of Ubuntu 12.04 or OpenFoam 2.20? Any help would greatly appreciated, Thanks. |
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May 23, 2013, 18:48 |
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#2 |
Retired Super Moderator
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,975
Blog Entries: 45
Rep Power: 128 |
Greetings Charlie and welcome to the forum!
You should have done some more research on the Hardware forum: http://www.cfd-online.com/Forums/hardware/ There you should have found at least this thread: http://www.cfd-online.com/Forums/har...re-6-core.html There are a few details to keep in mind:
Bruno
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May 23, 2013, 23:21 |
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#3 |
New Member
Charlie Feng
Join Date: Dec 2012
Posts: 2
Rep Power: 0 |
wyldckat, thanks for your reply. I am using 1600 MHz ram overclocked to 1866 MHz running in dual channel. Also, OpenFoam was installed from the Deb Pack. I think the problem comes from running my case using all 8 cores in parallel, so the L2 cache is split between the two cores, causing slow memory reads.
A previous thread talked about optimizing mpirun for core affinity. Can't say I understand cache very well, but I'll compare with running cases split between 4 sets of 2 cores. Last edited by wyldckat; May 24, 2013 at 18:18. Reason: merged the two consecutive posts, since the second one was just a typo correction... |
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