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From: Terry Dontje (Terry.Dontje_at_[hidden])
Date: 2007-11-06 08:38:34


George Bosilca wrote:
> If I understand correctly your question, then we don't need any
> extension. Each request has a unique ID (from PERUSE perspective).
> However, if I remember well this is only half implemented in our
> PERUSE layer (i.e. it works only for expected requests).
Looking at the peruse macros it looks to be that the unique ID is the
base_req address which I imagine rarely matches between processes.
> This should be quite easy to fix, if someone invest few hours into it.
>
> For the context id, a user can always use the c2f function to get the
> fortran ID (which for Open MPI is the communicator ID).
>
Cool, I didn't realize that.

thanks,

--td
> Thanks,
> george.
>
> On Nov 5, 2007, at 8:01 AM, Terry Dontje wrote:
>
>> Currently in order to do message tracing one either has to rely on some
>> error prone postprocessing of data or replicating some MPI internals up
>> in the PMPI layer. It would help Sun's tools group (and I believe U
>> Dresden also) if Open MPI would create a couple APIs that exoposed the
>> following:
>>
>> 1. PML Message ids used for a request
>> 2. Context id for a specific communicator
>>
>> I could see a couple ways of providing this information. Either by
>> extending the PERUSE probes or creating actual functions that one would
>> pass in a request handle or communicator handle to get the appropriate
>> data back.
>>
>> This is just a thought right now which why this email is not in an RFC
>> format. I wanted to get a feel from the community as to the interest in
>> such APIs and if anyone may have specific issues with us providing such
>> interfaces. If the responses seems positive I will follow this message
>> up with an RFC.
>>
>> thanks,
>>
>> --td
>> _______________________________________________
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>> devel_at_[hidden]
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