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Article #6283Re: How to detect number of CPUs and hyperthreading?
From: SubZero
Date: Sun, 22 May 2005 07:03
Date: Sun, 22 May 2005 07:03
42 lines
2260 bytes
2260 bytes
Hi Gambit, Thanks a lot for your answer. See below: "Remy Lebeau (TeamB)" <no.spam@no.spam.com> wrote in message news:429012e6$1@newsgroups.borland.com... > > "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. > What about AMD? Shouldn't there be an API function that supports both? Also, will Borland support 64-bit? Are binaries for AMD and Intel 64-bit are different or can they be the same? Best Regards, SZ
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X-Google-Thread: 10cc67,f023ae5d6b5f79c7 X-Google-Attributes: gid10cc67,public X-Google-Language: ENGLISH,ASCII-7-bit From: "SubZero" <g_ates@hotmail.com> Newsgroups: borland.public.cppbuilder.nativeapi References: <428f19db$1@newsgroups.borland.com> <429012e6$1@newsgroups.borland.com> Subject: Re: How to detect number of CPUs and hyperthreading? Date: Sun, 22 May 2005 10:03:05 +0300 Lines: 44 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-RFC2646: Format=Flowed; Original NNTP-Posting-Host: 85.99.188.174 Message-ID: <42902ea3@newsgroups.borland.com> X-Trace: newsgroups.borland.com 1116745379 85.99.188.174 (22 May 2005 00:02:59 -0700) Path: arc1-ca.pugleaf.net!g2news1.google.com!news3.google.com!newshub.sdsu.edu!npeer.de.kpn-eurorings.net!newsfeed00.sul.t-online.de!newsfeed01.sul.t-online.de!t-online.de!newsgroups.borland.com!not-for-mail