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Subject: Re: cpuinfo cache size
To: cygwin AT cygwin DOT com
References: <55896193 DOT 2080307 AT gmail DOT com> <20150623141737 DOT GS28301 AT calimero DOT vinschen DOT de> <loom DOT 20150803T112514-524 AT post DOT gmane DOT org>
From: Marco Atzeri <marco DOT atzeri AT gmail DOT com>
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Date: Mon, 3 Aug 2015 12:38:58 +0200
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On 8/3/2015 12:15 PM, Achim Gratz wrote:
> Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:
>> Cygwin is lacking the code to fetch L3 caches and afaics, it's not
>> overly simple.  At least calling cpuid as for L1 and L2 caches is not
>> sufficient, apparently.
>
> If you can use the Windows API, then this
> https://msdn.microsoft.com/en-us/library/ms683194.aspx
>
>>> Should be possible to have both info available ?
>>> Any idea how to obtain the other cache infos ?
>>
>> Not completely.  You have to use different cpuid codes for AMD and Intel
>> CPUs, and you have to call cpuid multiple times to get the full info
>> for all L3 caches of the system's CPUs, but I'm fuzzy on the details.
>
> I have no patches, but another difference to Linux is that the CPU frequency
> reported is the maximum (non-turbo) frequency instead of the actual one
> (which could be larger or lower depending on the frequency scaling in
> effect).  That seems to require more infrastructure, though.

I solved packing HWLOC

http://www.open-mpi.org/projects/hwloc/

It provide the same info in a simpler way

> Regards,
> Achim.
>

Regards
Marco


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