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Cadence Virtuoso Jop Policy Setup

Senan

Hello,

I am using Cadence Virtuoso IC6.1.8-64 bit.550.6,

I would like to ask about the Jop Policy setup, what does the option "Max Jops" refers to, if I increase this number will I have faster simulation? and what is the upper limit for this setting

Also, is there any setting in the "Resources" to optimize the speed, for example the Memory and the CPU setting from the jop policy setup

thank you

best regards

Parents

  • Max Jobs is the maximum number of simulations that can be run in parallel in ADE. If you have 100 simulations to run (due to corners, sweeps etc), and allow 50 jobs in parallel then the overall time to complete all simulations would typically be shorter than if you allowed 5 in parallel (the first would need to run 2 sequentially, compared with 20 sequentially). The exception is if the simulation time is extremely short as then the overhead of starting and managing all the jobs may dominate.

    Also you need to have sufficient licenses to be able to run that number of simulations in parallel. There is no upper limit on the maximum number of parallel jobs, but practically we have had issues with the "ICRP" flow if this is above a few hundred; that was one of the motivations for the newer "LSCS" flow introduced during IC6.1.8/ICADVM18.1, and that allows a much higher number of parallel simulations. In most cases customers have compute resource or license limitations which sets the upper limit for what is practical.

    However, regardless of all this, increasing max jobs will not increase the speed of individual simulations.

    Regards,

    Andrew

Reply

  • Max Jobs is the maximum number of simulations that can be run in parallel in ADE. If you have 100 simulations to run (due to corners, sweeps etc), and allow 50 jobs in parallel then the overall time to complete all simulations would typically be shorter than if you allowed 5 in parallel (the first would need to run 2 sequentially, compared with 20 sequentially). The exception is if the simulation time is extremely short as then the overhead of starting and managing all the jobs may dominate.

    Also you need to have sufficient licenses to be able to run that number of simulations in parallel. There is no upper limit on the maximum number of parallel jobs, but practically we have had issues with the "ICRP" flow if this is above a few hundred; that was one of the motivations for the newer "LSCS" flow introduced during IC6.1.8/ICADVM18.1, and that allows a much higher number of parallel simulations. In most cases customers have compute resource or license limitations which sets the upper limit for what is practical.

    However, regardless of all this, increasing max jobs will not increase the speed of individual simulations.

    Regards,

    Andrew

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