From: chrisl@vmware.com
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: How to get number of physical CPU in linux from user space?
Date: Fri, 25 Oct 2002 11:20:23 -0700 [thread overview]
Message-ID: <20021025182023.GA1397@vmware.com> (raw)
In-Reply-To: <2897727591.1035509219@[10.10.2.3]>
On Fri, Oct 25, 2002 at 01:27:00AM -0700, Martin J. Bligh wrote:
> Define "physical CPU number" ;-) If you want to deteact which
I mean the number of cpu chip you can count on the mother board.
> ones are paired up, I believe that if all but the last bit
> of the apicid is the same, they're siblings. You might have to
> dig the apicid out of the bootlog if the cpuinfo stuff doesn't
> tell you.
And you are right. Those apicid, after mask out the siblings,
are put in phys_cpu_id[] array in kernel.
I think about look at bootlog too, but that is not a reliable
way because bootlog might already been flush out after some
time.
Cheers
Chris
next prev parent reply other threads:[~2002-10-25 18:13 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-24 23:02 How to get number of physical CPU in linux from user space? chrisl
2002-10-25 0:47 ` Andrew Walrond
2002-10-25 8:26 ` Gianni Tedesco
2002-10-25 8:27 ` Martin J. Bligh
2002-10-25 18:20 ` chrisl [this message]
2002-10-25 18:35 ` David T Hollis
2002-10-25 18:52 ` Martin J. Bligh
2002-10-25 12:38 ` Dave Jones
2002-10-25 19:07 ` chrisl
-- strict thread matches above, loose matches on Subject: below --
2002-10-25 18:54 Nakajima, Jun
2002-10-25 19:12 ` chrisl
2002-10-25 19:05 Nakajima, Jun
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