Sorry to reply to an old thread, but weâre seeing this message with 2.1.0 built against CUDA 8.0. We're using libcuda.so.375.39. Has anyone had any luck suppressing these messages?
Post by Roland FehrenbacherHi 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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SJ> I'm sorry it's taking so long -- I'm on it though.
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 ?
Post by Roland Fehrenbacherafter 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
Post by Roland FehrenbacherHi,
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.
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