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Simulation CPU cores usage

AllenD

Hi Friends,

Can I please ask a question concerning simulation CPU cores usage. 

When I was using ADS on a Windows PC for simulation, the software will automatically use all the cores and the CPU usage is close to 95%. 

However, now I am using CADENCE IC 617 and MMSIM151 on a Linux machine with 10 cores CPU (20 threads). The simulation setup is like this:

ADE L --> Setup --> High-Performance Simulation Options. Then I click APS. choose Error Preset: DO not override; Use ++aps; Multi_Threading Manual #Threads: 20  (0-19)

But when I try to simulate, the CPU usage is about 40%. Though this is way better when I chose Spectre instead of APS to simulate(that's 5% CPU usage, due to only one thread is working.) 

Can anyone help me? How can I setup the software to use all the CPU power to speed up the simulation?

Thanks

Allen.

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  • OK, that's pretty small. I wouldn't expect much benefit beyond 8 CPUs (in fact the benefit then is probably tailing off). The best option is to look at your accuracy settings - have you set errpreset tighter than you need to, for example. Often using +diagnose (this is on the Setup->Environment forms in recent IC617 versions, but if not you can type in +diagnose in the userCmdLineOption field on Setup->Environment). This can give some suggestions as to what (if anything) is limiting the performance.

    If that doesn't get you anywhere, I'd suggest contacting customer support. It may be that you cannot get it to go any faster - sometimes long simulations will indeed take a long time!

    Regards,

    Andrew.

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  • OK, that's pretty small. I wouldn't expect much benefit beyond 8 CPUs (in fact the benefit then is probably tailing off). The best option is to look at your accuracy settings - have you set errpreset tighter than you need to, for example. Often using +diagnose (this is on the Setup->Environment forms in recent IC617 versions, but if not you can type in +diagnose in the userCmdLineOption field on Setup->Environment). This can give some suggestions as to what (if anything) is limiting the performance.

    If that doesn't get you anywhere, I'd suggest contacting customer support. It may be that you cannot get it to go any faster - sometimes long simulations will indeed take a long time!

    Regards,

    Andrew.

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