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APS, Multi-threading, High-Performance Simulation...

aditeman

Andrew,

 

I am a bit confused with all of the high performance simulation options in ADE-XL/GXL.

I am using IC 6.1.5.506 with  MMSIM 10.11.200

On ADE I have:

  1. "Options->Job Setup->Max Jobs"  

   2.  "Options->Run Options-> Run In"

  3.  "High-Performance Simulation->Mode, Multithreading options, Affinity"

  4. "Options->Analog->Multithreading Options"

Maybe others...

 

What is the up to date way to run my simulations as fast as possible?

The main reason I'm asking is that I've had some problems when setting things such as APS + Max Jobs=8. For example, I've had these settings and sent a small simulation with a few corners and after waiting 10 minutes it still hadn't started. In general, it seems to take minutes until simulations start running sometimes (and then they run very fast).

Any suggestions/explanations?

 

Thanks,

 

ADi 

 

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  • Andrew Beckett

    Rob,

    It's quite hard to be precise about this - APS supports up to 32 cores these days - and I have customers using that number (for very large circuits - e.g. several million transistors and even larger numbers of parasitics), so your mileage may vary. Generally speaking it's bigger circuits that will benefit from more threads. Doing some quick experiments with different number of threads would allow you to assess this for your size of design. You can check the utilization figures too that are reported in the log file (bearing in mind that you really wouldn't expect it to be able to fully utiliize all threads anyway).

    Regards,

    Andrew.

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  • Andrew Beckett

    Rob,

    It's quite hard to be precise about this - APS supports up to 32 cores these days - and I have customers using that number (for very large circuits - e.g. several million transistors and even larger numbers of parasitics), so your mileage may vary. Generally speaking it's bigger circuits that will benefit from more threads. Doing some quick experiments with different number of threads would allow you to assess this for your size of design. You can check the utilization figures too that are reported in the log file (bearing in mind that you really wouldn't expect it to be able to fully utiliize all threads anyway).

    Regards,

    Andrew.

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