[Openmp-dev] cpuinfo file reliance

[Jeff Hammond via Openmp-dev]

I still haven't seen a problem statement from the original poster, but it
seems like hwloc is the solution if maintaining architecture-specific
porting of /proc/cpuinfo is too difficult.  However, this should be
demonstrated with a bug report and unsupported use case before alternatives
are discussed.

Jeff

On Fri, Jul 3, 2020 at 2:18 PM Hal Finkel <hfinkel at anl.gov> wrote:

>
> On 7/3/20 3:42 PM, Itaru Kitayama via Openmp-dev wrote:
>
> Jeff,
> Linux supports other arches than X86, and the
> layout of cpuinfo is different across the architectures.
>
> In the runtime code if you take a look at already  there are ifdefs.
>
> Itaru.
>
>
> The alternative that you're proposing is to fork lscpu to read
> /proc/cpuinfo instead?
>
> We do understand that /proc/cpuinfo has architecture dependencies, and
> this is unfortunate in this context, but it is the interface that Linux
> provides. How does lscpu deal with those dependencies? Should our parser
> just be more robust?
>
>  -Hal
>
>
>
> On Fri, Jul 3, 2020 at 23:48 Jeff Hammond <jeff.science at gmail.com> wrote:
>
>> I’m not sure lscpu program is any better and it’s not standard on Linux
>> the way /proc/cpuinfo is.
>>
>> What is the specific problem you are seeing? Perhaps you can explain that
>> before trying to design a solution.
>>
>> Jeff
>>
>> > On Jul 2, 2020, at 10:55 PM, Itaru Kitayama via Openmp-dev <
>> openmp-dev at lists.llvm.org> wrote:
>> >
>> > Is there a plan to move away from arch dependent cpuinfo file to lscup
>> > when creating an affinity map? It has clearly different a format on
>> AArch64.
>> > _______________________________________________
>> > Openmp-dev mailing list
>> > Openmp-dev at lists.llvm.org
>> > https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
>>
>
> _______________________________________________
> Openmp-dev mailing listOpenmp-dev at lists.llvm.orghttps://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
>
> --
> Hal Finkel
> Lead, Compiler Technology and Programming Languages
> Leadership Computing Facility
> Argonne National Laboratory
>
>

-- 
Jeff Hammond
jeff.science at gmail.com
http://jeffhammond.github.io/
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