SMP Scaling Capabilities

January 11, 2009, 23:01

All I understand that scaling for SMP version is limited beyond 4 CPUs. so, have anyone tested beyond 4 CPUs and anyone know if this issue will be resolve in v9.4?

January 14, 2009, 10:43

CK,

It is becoming common to run on 8 processors, scaling is reasonable, but not outstanding, factor of 3-4 at best. The scaling is sensitive to the physical and numerical models selections, mesh size and dimension.

No dramatic improvement is expected in 9.4, but work is under way to extend SMP scaling beyond 8 threads.

Michael

January 14, 2009, 22:03

Michael Noticed GMO only allow to run in serial processing thus not able to fully utilize the SMP feature. so, will it still speed up if run at 4 cores?

January 16, 2009, 00:49

You are right, the GMO model is still largely serial, but combined with the parallelized fluids solver, should still scale. Most part of the fluid motion solution have been parallelized.

Michael

January 11, 2009, 23:01	SMP Scaling Capabilities	#1
CK Guest Posts: n/a	All I understand that scaling for SMP version is limited beyond 4 CPUs. so, have anyone tested beyond 4 CPUs and anyone know if this issue will be resolve in v9.4?

January 14, 2009, 10:43	Re: SMP Scaling Capabilities	#2
michael barkhudarov Guest Posts: n/a	CK, It is becoming common to run on 8 processors, scaling is reasonable, but not outstanding, factor of 3-4 at best. The scaling is sensitive to the physical and numerical models selections, mesh size and dimension. No dramatic improvement is expected in 9.4, but work is under way to extend SMP scaling beyond 8 threads. Michael

January 14, 2009, 22:03	Re: SMP Scaling Capabilities	#3
CK Guest Posts: n/a	Michael Noticed GMO only allow to run in serial processing thus not able to fully utilize the SMP feature. so, will it still speed up if run at 4 cores?

January 16, 2009, 00:49	Re: SMP Scaling Capabilities	#4
michael barkhudarov Guest Posts: n/a	You are right, the GMO model is still largely serial, but combined with the parallelized fluids solver, should still scale. Most part of the fluid motion solution have been parallelized. Michael

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