>>>>> "SJ" == Sylvain Jeaugey <sjeau...@nvidia.com> writes:
Hi Sylvain,
thanks for looking into this further.
SJ> I'm still working to get a clear confirmation of what is
SJ> printing this error message and since when.
SJ> However, running strings, I could only find this string in
SJ> /usr/lib/libnvidia-ml.so, which comes with the CUDA driver, so
SJ> it should not be related to the CUDA runtime version ... but
SJ> again, until I find the code responsible for that, I can't say
SJ> for sure.
libcuda (in my case libcuda.so.367.57) also contains the string, and I'm
pretty sure, that's where it's coming from. libcudart (linked to orted
and libmpi.so.x) seems to dlopen libcuda.1 (at least "strings libcudart"
suggests that) ...
Best,
Roland
-------
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--- HPC / Storage / Cloud Linux Cluster OS ---
SJ> I'm sorry it's taking so long -- I'm on it though.
SJ> On 03/24/2017 01:56 PM, Roland Fehrenbacher wrote:
>>>>>>> "SJ" == Sylvain Jeaugey <sjeau...@nvidia.com> writes:
>> Hi Sylvain,
>>
SJ> Hi Roland, I can't find this message in the Open MPI source
SJ> code. Could it be hwloc ? Some other library you are using ?
>>
>> after a longer detour about the suspicion it might have something
>> to do with nvml support of hwloc, I now found that a change in
>> libcudart between 7.5 and 8.0 is the cause of the messages
>> appearing now. Our earlier 1.8 version was built against CUDA 7.5
>> and didn't show the problem, but a 1.8 version built against CUDA
>> 8 shows the same problem as 2.0.2 built against CUDA 8. Do you
>> think you could ask your team members at Nvidia how this new
>> behaviour in libcudart can be suppressed?
>>
>> BTW: Disabling nvml support for the internal hwloc has the effect
>> that OpenMPI doesn't link in libnvidia-ml.so.x anymore, but has
>> no effect on the messages.
>>
>> Thanks,
>>
>> Roland
>>
SJ> On 03/16/2017 04:23 AM, Roland Fehrenbacher wrote:
>> >> Hi,
>> >>
>> >> OpenMPI 2.0.2 built with cuda support brings up lots of
>> >> warnings like
>> >>
>> >> NVIDIA: no NVIDIA devices found
>> >>
>> >> when running on HW without Nvidia devices. Is there a way to
>> >> suppress these warnings? It would be quite a hassle to
>> >> maintain different OpenMPI builds on clusters with just some
>> >> GPU machines.
>> _______________________________________________ users mailing
>> list users@lists.open-mpi.org
>> https://rfd.newmexicoconsortium.org/mailman/listinfo/users
SJ>
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