AMD or Intel for Star-CCM+

Marcelo · February 10, 2011, 12:28

Dear frinds,

I always had used Star-CCM+ in Intel CPUs computers... now I need to buy a better machine and i need to decide between Opteron (12 real cores) solution vs Xeon (6 real cores, 12 with HT)...

In the same node, I can have 64 cores of opeteron v/s 12 (24) of Xeon 5670...

I could not find a benchmark of star-ccm+ in this opteron family...

Anybody have experince with these?

Regards from Chile,
Marcelo

RobertB · February 11, 2011, 08:07

How do you divide 64 by 12 and get an integer?

Depending on your license this may make more difference than the total CPU throughput - typically most speed per core is cheapest.

It is not clear for the high core per package unit that the memory bandwidth can really support the higher number of cores per CPU under a CFD load.

For a different CFD code using two processors the elapsed time of 24 magny cours 2.2GHZ processors was about 70% of 8 or 12 2.93GHZ Xeon cores.

For the Intels the additional cores did little good, for the AMDs going from 16 to 24 made it about 10-15% faster.

Per core the Xeons were about twice as fast (if you look at the quad cores).

Marcelo · February 11, 2011, 18:58

Sorry I was tinking in 48...

And in $$$ is cheaper 4xOpetron of 12 cores in one node that 2 nodes of 2 xeon of 6 cores...

but one intel is beter that one opteron...

in your opinion... what do you choice?

RobertB · February 11, 2011, 21:18

I think it really comes down to your STAR parallel licensing cost.

Marcelo · February 11, 2011, 21:22

I am thinking in power sesion licence... or a infitity nodes licence

sail · February 14, 2011, 09:52

i'm interested as well.

obviously the benchmarks of starccm+ are not done using the same files, but if somebody have some first hand experience, please share it.

Marcelo · February 18, 2011, 16:43

I have a benchmark and it said that 24 cores of AMD (2 cpu) are better that 2 new Xeon 12 cores...

Now I am looking for a distribuitor in Chile!

Regards,
Marcelo

sail · February 19, 2011, 05:17

Quote:

Originally Posted by Marcelo

I have a benchmark and it said that 24 cores of AMD (2 cpu) are better that 2 new Xeon 12 cores...

Now I am looking for a distribuitor in Chile!

Regards,
Marcelo

intersting. exactly wich amd cpu and xeon are we comparing? do you mind sharing the paper? or it was an internal, private test?

February 10, 2011, 12:28	AMD or Intel for Star-CCM+	#1
Marcelo New Member Marcelo Join Date: Mar 2009 Location: Valparaiso Chile Posts: 26 Rep Power: 17	Dear frinds, I always had used Star-CCM+ in Intel CPUs computers... now I need to buy a better machine and i need to decide between Opteron (12 real cores) solution vs Xeon (6 real cores, 12 with HT)... In the same node, I can have 64 cores of opeteron v/s 12 (24) of Xeon 5670... I could not find a benchmark of star-ccm+ in this opteron family... Anybody have experince with these? Regards from Chile, Marcelo

February 11, 2011, 21:22		#5
Marcelo New Member Marcelo Join Date: Mar 2009 Location: Valparaiso Chile Posts: 26 Rep Power: 17	I am thinking in power sesion licence... or a infitity nodes licence Last edited by Marcelo; February 11, 2011 at 21:59.

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February 11, 2011, 08:07		#2
RobertB Senior Member Robert Join Date: Jun 2010 Posts: 117 Rep Power: 16	How do you divide 64 by 12 and get an integer? Depending on your license this may make more difference than the total CPU throughput - typically most speed per core is cheapest. It is not clear for the high core per package unit that the memory bandwidth can really support the higher number of cores per CPU under a CFD load. For a different CFD code using two processors the elapsed time of 24 magny cours 2.2GHZ processors was about 70% of 8 or 12 2.93GHZ Xeon cores. For the Intels the additional cores did little good, for the AMDs going from 16 to 24 made it about 10-15% faster. Per core the Xeons were about twice as fast (if you look at the quad cores).

February 11, 2011, 18:58		#3
Marcelo New Member Marcelo Join Date: Mar 2009 Location: Valparaiso Chile Posts: 26 Rep Power: 17	Sorry I was tinking in 48... And in $$$ is cheaper 4xOpetron of 12 cores in one node that 2 nodes of 2 xeon of 6 cores... but one intel is beter that one opteron... in your opinion... what do you choice?

February 11, 2011, 21:18		#4
RobertB Senior Member Robert Join Date: Jun 2010 Posts: 117 Rep Power: 16	I think it really comes down to your STAR parallel licensing cost.

February 14, 2011, 09:52		#6
sail Senior Member Vieri Abolaffio Join Date: Jul 2010 Location: Always on the move. Posts: 308 Rep Power: 16	i'm interested as well. obviously the benchmarks of starccm+ are not done using the same files, but if somebody have some first hand experience, please share it.

February 18, 2011, 16:43		#7
Marcelo New Member Marcelo Join Date: Mar 2009 Location: Valparaiso Chile Posts: 26 Rep Power: 17	I have a benchmark and it said that 24 cores of AMD (2 cpu) are better that 2 new Xeon 12 cores... Now I am looking for a distribuitor in Chile! Regards, Marcelo