FX8350 is terrible for OpenFOAM
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.
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:
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.
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