40 Core Server is slower an 12 Core Workstation???
40 Core Server is slower an 12 Core Workstation???
(OP)
Hi everyone,
My company recently purchased a 40 Core HP Proliant DL580 server (4 processors, 10 cores each, 2.4 GHz).
This is an upgrade from our 12 core HP Z800 workstation (2 processors, 6 cores each, 3.06 GHz)
Note that we have only 19 tokens, so we max out at 24 cores.
We are seeing mixed results comparing our 12 core workstation and 24 cores on our server. Some small explicit jobs are faster, but some larger explicit jobs are slower, including example E1 from Abaqus. (http://www.simulia.com/support/v611/v611_performan...)
Does anyone have any idea why running 24 cores on this 40 core server is not significantly faster than a 12 core workstation?
Thanks,
Drew
My company recently purchased a 40 Core HP Proliant DL580 server (4 processors, 10 cores each, 2.4 GHz).
This is an upgrade from our 12 core HP Z800 workstation (2 processors, 6 cores each, 3.06 GHz)
Note that we have only 19 tokens, so we max out at 24 cores.
We are seeing mixed results comparing our 12 core workstation and 24 cores on our server. Some small explicit jobs are faster, but some larger explicit jobs are slower, including example E1 from Abaqus. (http://www.simulia.com/support/v611/v611_performan...)
Does anyone have any idea why running 24 cores on this 40 core server is not significantly faster than a 12 core workstation?
Thanks,
Drew





RE: 40 Core Server is slower an 12 Core Workstation???
As far as I know (and have read online), there is more to it than just the number of cores. For example, a simple linear model (no large rotations, strains, linear material, no contact, etc.) may work faster on a 2 core machine than a 8 core machine. Why? Because if you force this simple model to run on multiple cores, memory I/O and data transfer speeds will start playing a role in offsetting the benefit of more cores. Also, you may wish to: a) disable hyperthreading (if it is enabled), b) not run anything except the model on the machine, c) disable all non-essential services, d) run the model immediately after re-starting the machine (in order to prevent the OS from starting unnecessary services and use available memory).
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: 40 Core Server is slower an 12 Core Workstation???
RE: 40 Core Server is slower an 12 Core Workstation???
RE: 40 Core Server is slower an 12 Core Workstation???
a) relatively poor system bus speeds,
b) low L1/L2 cache memory,
c) relatively slow memory card (with chips running at different speeds),
d) small page file (see this)
e) slower hard drive rpm, and
f) poor graphics card (only if you are running a browser, CAE, SolidWorks, etc. while running your simulation)
If your workstation is home-brewed, then, sub-optimal compatibility of components may also be slowing things down.
http://www.eng-tips.com/faqs.cfm?fid=376
http://www.eng-tips.com/faqs.cfm?fid=1083
RE: 40 Core Server is slower an 12 Core Workstation???
We have the same problem , we have bought a server with 32cores instead of 12cores before, we have 19 tokens and can so launch jobs on 24 cores maximum.
Up to now (we bought the station 1 month ago), cpu time with theses jobs on 24 cores are longer than those launched on 6 or 12cores on the old and new machine!!
We are excusively using abaqus explicite with highly non-linear (large-strain) problems.
Thanks for your help.
Ludovic.
France.
RE: 40 Core Server is slower an 12 Core Workstation???