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Is 64-bit helpful for Spectre efficiency? (Read 3184 times)

Terence Junior Member Offline CAD Lab. Posts: 23 Taiwan, R.O.C.	Is 64-bit helpful for Spectre efficiency? Aug 13^th, 2008, 10:51pm Hi all, I am considering to upgrade our Linux from 32 to 64-bit. Our platform is Cadence Virtuoso. Does anyone have experience if 64-bit is helpful for Spectre/SpectreRF efficiency? Thanks! Regards, Terence
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bernd Senior Member Offline Posts: 229 Munich/Germany	Re: Is 64-bit helpful for Spectre efficiency? Reply #1 - Aug 14^th, 2008, 2:57am With a 32 bit CPU you have a limited memory addressing to 4GB, which you have not with a 64 bit CPU. The 64 bit CPU helps you for Spectre/RF if you doing memory expensive analysis, like PSS or QPSS. Don't forget to set the Cadence DFII environment variable 'CDS_AUTO_64BIT' to your required value. * bernd
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Terence Junior Member Offline CAD Lab. Posts: 23 Taiwan, R.O.C.	Re: Is 64-bit helpful for Spectre efficiency? Reply #2 - Aug 14^th, 2008, 6:11pm Hi Bernd, Thanks for your reply. Is your overall Cadence Virtuoso platform running smooth with 64-bit? Thanks!!! Regards, Terence
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bernd

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Posts: 229
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Re: Is 64-bit helpful for Spectre efficiency?
Reply #3 - Aug 18^th, 2008, 4:51am

In principle yes.
There are a few exceptions like CDL in/out, the hierarchy editor and
AMS designer which we have issues with 64bit.
For some you can use the UNIX env. variable with the exclude setting (CDS_AUTO_64BIT=EXCLUDE:<TOOL>)
But this I guess is also dependent on the version of Cadence DFII you use.

* bernd

Just another lonesome cad guy

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