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Article #6282Re: How to detect number of CPUs and hyperthreading?
From: Remy Lebeau (TeamB)
Date: Sun, 22 May 2005 05:04
Date: Sun, 22 May 2005 05:04
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1784 bytes
"SubZero" <g_ates@hotmail.com> wrote in message news:428f19db$1@newsgroups.borland.com... > I wish to get the number of CPUs GetSystemInfo() > whether they are hyper threading or multi-cored. You need to query each CPU directly, via the CPUID assembly instruction. You can use SetThreadAffinityMask() to specify which CPU a given thread will execute on. Calling CPUID with an EAX register value of 0x01 will return the CPU's version info in the EBX register. Bits 16-23 of the EBX register will specify the number of logical processors per physical processor. For a hyper-threaded CPU, this value will be 2. I don't know how to identify dual-core CPUs. Do note, however, that a dual-core CPU can also support hyper-threading as well. Go to Intel's website to download the manuals for the Pentium assembly instruction set for more details. Gambit
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X-Google-Thread: 10cc67,f023ae5d6b5f79c7 X-Google-Attributes: gid10cc67,public X-Google-Language: ENGLISH,ASCII-7-bit From: "Remy Lebeau \(TeamB\)" <no.spam@no.spam.com> Newsgroups: borland.public.cppbuilder.nativeapi References: <428f19db$1@newsgroups.borland.com> Subject: Re: How to detect number of CPUs and hyperthreading? Date: Sat, 21 May 2005 22:04:53 -0700 Lines: 28 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 NNTP-Posting-Host: 68.69.17.41 Message-ID: <429012e6$1@newsgroups.borland.com> X-Trace: newsgroups.borland.com 1116738278 68.69.17.41 (21 May 2005 22:04:38 -0700) Path: arc1-ca.pugleaf.net!g2news1.google.com!news1.google.com!news2.google.com!proxad.net!gatel-ffm!gatel-ffm!194.25.134.126.MISMATCH!newsfeed01.sul.t-online.de!t-online.de!newsgroups.borland.com!not-for-mail