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running multithread simulation

MenghanSun

Dear all,

I'm currently using cadence616+mmsim141, and our school has the xl-tier license. However, apparently the xl-tier license doesn't allow us to run aps, and in current version of mmsim, we are not allowed to run spectre with more than one thread, it says that if you want to use multi-thread, you have to use aps. So, is there anyway to still use multithread, downgrading to a previous version of mmsim? Would that work?

I know that the license is xl-tier, but I'm not sure about the exact details of it. How to find out the exact details of the license, the number of licenses available? The school is definitely not going to purchase the gxl-tier license..... 

Thanks,

Menghan

  • Andrew Beckett

    Hi Menghan,

    The "XL tier" is presumably ADE XL, which is not the license used for simulation anyway, so that's irrelevant. I would expect you have Multimode simulation licenses but it is possible that you only have the individual Spectre à la carte licenses.

    We haven't supported multi-threading in spectre for some time (I think it was finally removed in MMSIM15.1, but it's considerably longer since it stopped being supported - probably 10 years) - now the only supported multi-threading mode is when using APS (the spectre-only multi-threading only gave very limited speed up because there were big things like the matrix solve that wasn't computed in parallel, and it hadn't had any attention for many releases).

    Assuming you have $CDS_LIC_FILE set to point to your license server, you can try:

    lmstat -f Virtuoso_Multi_mode_Simulation -c $CDS_LIC_FILE

    lmstat -f Virtuoso_Spectre -c $CDS_LIC_FILE

    lmstat -f Virtuoso_MMSIM_CPU_Accelerator -c $CDS_LIC_FILE

    lmstat -f Virtuoso_Acceler_Parallel_sc -c $CDS_LIC_FILE

    These should give you some idea as to what you have access to.

    Regards,

    Andrew.

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