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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 tried out your suggestion, but does not see improvement. The design is bigger than 500K during placeDesign. Maybe I am using scandef. There are many scan chaisn due to the use of scan compressor. I think it is a easier flow to use scandef than to define scan-in and scan-out in Encounter especially with scan compressor the scan-ins and scan-outs are at defined at hier ports.

    Do you have any idea why disable scan reordering can make placeDesign with modulePlan run faster?

    Regards,
    Eng Han


    Originally posted in cdnusers.org by EngHan
Reply

  • Hi Li Siang,

    I tried out your suggestion, but does not see improvement. The design is bigger than 500K during placeDesign. Maybe I am using scandef. There are many scan chaisn due to the use of scan compressor. I think it is a easier flow to use scandef than to define scan-in and scan-out in Encounter especially with scan compressor the scan-ins and scan-outs are at defined at hier ports.

    Do you have any idea why disable scan reordering can make placeDesign with modulePlan run faster?

    Regards,
    Eng Han


    Originally posted in cdnusers.org by EngHan
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