On Wed, Nov 11, 2009 at 2:34 PM, Ben Haller <bhcocoa...@sticksoftware.com> wrote: > OK, either I'm being exceptionally dense or there's a bug in NSProcessInfo > on 10.5. If I execute: > > NSProcessInfo *processInfo = [NSProcessInfo processInfo]; > int processorCount = [processInfo activeProcessorCount]; > > NSLog(@"processorCount == %d", processorCount); > > I get a log that says "processorCount == 16". But I am under the strong > impression that I have a dual-processor quad-core machine, which makes 8 > processors, and System Profiler backs me up on this: > > Model Name: Mac Pro > Model Identifier: MacPro4,1 > Processor Name: Quad-Core Intel Xeon > Processor Speed: 2.26 GHz > Number Of Processors: 2 > Total Number Of Cores: 8
IIRC the latest Mac Pro system use Xeon processors that are HT (hyper-threading, aka SMT) capable, each core is capable of running two threads concurrently. This gives you 16 "logical" cores even though you only have 8 physical cores. Try the following... [0:512] > sysctl hw.physicalcpu hw.logicalcpu hw.physicalcpu: 8 hw.logicalcpu: 8 _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
