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Re: [NEWS] Mac Pro CPUs can be replaced

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In message <52c37e93$0$9689$c3e8da3$aae71a0a@news.astraweb.com> 
  JF Mezei <jfmezei.spamnot@vaxination.ca> wrote:
> BTWL: Generic question:

> With current memory interfaces, is there any performance differences
> between having 1 12 core CPU vs 2 6 core CPUs ?

Yes. The 12 core has more than double the L3 Cache (25MB instead of
12MB, IIRC)

> Do the current intel processors have shared cache between cores ?

Between cores on the CPU? I believe so. The L2 cache is not shared, but
the L3 is.

> Would 1 12 core processor with 1 shared cache memory be different than 2
> 6 core processors with 2 separate caches (twice the cache size, but not
> shared by all cores)

I suspect the difference of having a single 25MB L3 cache is significant
versus 2 12MB L3 caches, but that's just my feeling.

> If the first 6 cores deal with one application and the second 6 cores
> deal with different app/data, then having separate caches would be an
> advantage since you have overall more cache. Burt if you do a video that
> makes use of all 12 cores, then having a single cache would make sense.

That's not how multi-processor/multi-core systems work, and certainly
not on OS X. GCD makes the decisions on where to send work, not the
program.

-- 
'Now what?' it said.  IT'S UP TO YOU. IT'S ALWAYS UP TO YOU. --Maskerade

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[NEWS] Mac Pro CPUs can be replaced Your Name <YourName@YourISP.com> - 2013-12-28 19:17 +1300
  Re: [NEWS] Mac Pro CPUs can be replaced JF Mezei <jfmezei.spamnot@vaxination.ca> - 2013-12-28 04:25 -0500
    Re: [NEWS] Mac Pro CPUs can be replaced Your Name <YourName@YourISP.com> - 2013-12-29 09:49 +1300
      Re: [NEWS] Mac Pro CPUs can be replaced JF Mezei <jfmezei.spamnot@vaxination.ca> - 2013-12-28 18:36 -0500
        Re: [NEWS] Mac Pro CPUs can be replaced Jolly Roger <jollyroger@pobox.com> - 2013-12-29 04:23 +0000
          Re: [NEWS] Mac Pro CPUs can be replaced JF Mezei <jfmezei.spamnot@vaxination.ca> - 2013-12-29 01:23 -0500
          Re: [NEWS] Mac Pro CPUs can be replaced Lewis <g.kreme@gmail.com.dontsendmecopies> - 2013-12-30 04:32 +0000
            Re: [NEWS] Mac Pro CPUs can be replaced nospam <nospam@nospam.invalid> - 2013-12-30 00:30 -0500
            Re: [NEWS] Mac Pro CPUs can be replaced Julian Vrieslander <MY_FIRST_NAME@MY_LAST_NAME.com> - 2013-12-31 15:32 -0800
              Re: [NEWS] Mac Pro CPUs can be replaced Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-01-01 00:05 +0000
              Re: [NEWS] Mac Pro CPUs can be replaced JF Mezei <jfmezei.spamnot@vaxination.ca> - 2013-12-31 19:35 -0500
                Re: [NEWS] Mac Pro CPUs can be replaced Your Name <YourName@YourISP.com> - 2014-01-01 13:45 +1300
                Re: [NEWS] Mac Pro CPUs can be replaced JF Mezei <jfmezei.spamnot@vaxination.ca> - 2013-12-31 21:24 -0500
                Re: [NEWS] Mac Pro CPUs can be replaced JF Mezei <jfmezei.spamnot@vaxination.ca> - 2013-12-31 21:33 -0500
                Re: [NEWS] Mac Pro CPUs can be replaced dempson@actrix.gen.nz (David Empson) - 2014-01-01 21:07 +1300
                Re: [NEWS] Mac Pro CPUs can be replaced JF Mezei <jfmezei.spamnot@vaxination.ca> - 2014-01-01 17:43 -0500
                Re: [NEWS] Mac Pro CPUs can be replaced dempson@actrix.gen.nz (David Empson) - 2014-01-02 22:48 +1300
                Re: [NEWS] Mac Pro CPUs can be replaced Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-01-02 20:20 +0000
                Re: [NEWS] Mac Pro CPUs can be replaced Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-01-01 09:31 +0000
                Re: [NEWS] Mac Pro CPUs can be replaced Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-01-01 11:59 +0000
                Re: [NEWS] Mac Pro CPUs can be replaced Michelle Steiner <michelle@michelle.org> - 2013-12-31 19:48 -0700

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