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tip of the week: improve run time during initial placement

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You can cut your run time by up to 3x (for 500k instances) by not doing scan recordering during placeDesign.  You can do the following
.
. SETUP UP YOUR SCAN IN & SCAN OUT
.
setPlaceMode -noReorderScan -modulePlan
placeDesign -with_your_own_option
scanReorder
optDesign -preCts

With the above flow, the run time is reduced at the same time congestion & timing do not get worst.

li siang



Originally posted in cdnusers.org by lisiang
Parents

  • Hi Li Siang,

    I am not using "-inPlaceOpt" with -modulePlan. I using optDesign after placeDesign. This is the reason why I don't see improvement in runtime.

    In your experience, do you prefer to use "-inplaceOpt"? Somehow it appear to me that running in two steps give better result.
    Regards,
    Eng Han


    Originally posted in cdnusers.org by EngHan
Reply

  • Hi Li Siang,

    I am not using "-inPlaceOpt" with -modulePlan. I using optDesign after placeDesign. This is the reason why I don't see improvement in runtime.

    In your experience, do you prefer to use "-inplaceOpt"? Somehow it appear to me that running in two steps give better result.
    Regards,
    Eng Han


    Originally posted in cdnusers.org by EngHan
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