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 Using threads (cores) greater than 64 in APS 

Last post Mon, Apr 29 2013 4:26 AM by Andrew Beckett. 4 replies.
Started by RFStuff 20 Apr 2013 12:53 AM. Topic has 4 replies and 604 views
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  • Sat, Apr 20 2013 12:53 AM

    • RFStuff
    • Top 25 Contributor
    • Joined on Tue, Feb 5 2013
    • Posts 214
    • Points 3,780
    Using threads (cores) greater than 64 in APS Reply

     Dear All,

    Is it possible to use more than 64 threads in APS ?

     ( When I run a big PEXed circuit with 64 Cores ( manullay setting) SPECTRE gives warning as:-

      WARNING (SPECTRE-407): Total number of threads (I251.N_TIA_Q_IN_PLUS_XI1/XI0/XI18/MC4_g)  exceeds 64 in disributed APS )

    Why this warning is cropping up ?

        

    Kind Regards,

    • Post Points: 20
  • Sat, Apr 20 2013 8:11 PM

    Re: Using threads (cores) greater than 64 in APS Reply

    Hi RF Stuff,

    APS for now supports upto 64 cores. However, which MMSIM version are you using? You can find this either from the log file or using -

    spectre -W

    from the unix command line.

    The support for 64 cores has been started from MMSIM11.1.

     

    • Post Points: 20
  • Sat, Apr 20 2013 10:02 PM

    • RFStuff
    • Top 25 Contributor
    • Joined on Tue, Feb 5 2013
    • Posts 214
    • Points 3,780
    Re: Using threads (cores) greater than 64 in APS Reply

     My version is sub-version  12.1.0.347.isr3 

    Kind Regards,

    • Post Points: 20
  • Sun, Apr 21 2013 8:44 PM

    Re: Using threads (cores) greater than 64 in APS Reply

    Hi RF Stuff,

    So, in your version (which is almost latest) as I mentioned in my previous reply, APS supports upto 64 cores.

     

    With Regards,

    Ashish

     

    • Post Points: 20
  • Mon, Apr 29 2013 4:26 AM

    Re: Using threads (cores) greater than 64 in APS Reply

    Do note that this number of cores will only be worthwhile if the circuit is massive (multi-millions of components). Also, you're only likely to see scaling in the transient analysis, and I know you've been using APS with the RF analyses - I doubt very much whether you'd see scalable utilization with 64 cores (I suspect memory would be the limiting factor on a large enough design).

    Regards,

    Andrew.

    • Post Points: 5
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Started by RFStuff at 20 Apr 2013 12:53 AM. Topic has 4 replies.