[slurm-users] "fatal: can't stat gres.conf"

[Alex Chekholko]

Thanks for the suggestion; if my memory serves me right, I had to do that
previously to cause the drivers to load correctly after boot.

However, in this case both 'nvidia-smi' and 'nvidia-smi -L' run just fine
and produce expected output.

One thing I see that is different is my older nodes have these two "uvm"
devices:

working:
[root at n0035 ~]# ls -alhtr /dev/nvidia*
crw-rw-rw- 1 root root 195, 255 Nov  6  2017 /dev/nvidiactl
crw-rw-rw- 1 root root 195,   0 Nov  6  2017 /dev/nvidia0
crw-rw-rw- 1 root root 195,   1 Nov  6  2017 /dev/nvidia1
crw-rw-rw- 1 root root 195,   2 Nov  6  2017 /dev/nvidia2
crw-rw-rw- 1 root root 195,   3 Nov  6  2017 /dev/nvidia3
crw-rw-rw- 1 root root 241,   1 Nov  7  2017 /dev/nvidia-uvm-tools
crw-rw-rw- 1 root root 241,   0 Nov  7  2017 /dev/nvidia-uvm

not working:
[root at n0039 ~]# ls -alhtr /dev/nvidia*
crw-rw-rw- 1 root root 195, 255 Jul 12 17:09 /dev/nvidiactl
crw-rw-rw- 1 root root 195,   0 Jul 12 17:09 /dev/nvidia0
crw-rw-rw- 1 root root 195,   1 Jul 12 17:09 /dev/nvidia1
crw-rw-rw- 1 root root 195,   2 Jul 12 17:09 /dev/nvidia2
crw-rw-rw- 1 root root 195,   3 Jul 12 17:09 /dev/nvidia3



On Mon, Jul 23, 2018 at 3:41 PM Bill <bill at simplehpc.com> wrote:

> Hi Alex,
>
> Try run nvidia-smi before start slurmd, I also found this issue. I have to
> run nvidia-smi before slurmd when I reboot system.
> Regards,
> Bill
>
>
> ------------------ Original ------------------
> *From:* Alex Chekholko <alex at calicolabs.com>
> *Date:* Tue,Jul 24,2018 6:10 AM
> *To:* Slurm User Community List <slurm-users at lists.schedmd.com>
> *Subject:* Re: [slurm-users] "fatal: can't stat gres.conf"
>
> Hi all,
>
> I have a few working GPU compute nodes.  I bought a couple of more
> identical nodes.  They are all diskless; so they all boot from the same
> disk image.
>
> For some reason slurmd refuses to start on the new nodes; and I'm not able
> to find any differences in hardware or software.  Google searches for
> "error: Waiting for gres.conf file " or "fatal: can't stat gres.conf file"
> are not helping.
>
> The gres.conf file is there and identical on all nodes. The
> /dev/nvidia[0-3] files are there and 'nvidia-smi -L' works fine.  What am I
> missing?
>
>
> [root at n0038 ~]# slurmd -Dcvvv
> slurmd: debug2: hwloc_topology_init
> slurmd: debug2: hwloc_topology_load
> slurmd: debug:  CPUs:20 Boards:1 Sockets:2 CoresPerSocket:10
> ThreadsPerCore:1
> slurmd: Node configuration differs from hardware: CPUs=16:20(hw)
> Boards=1:1(hw) SocketsPerBoard=16:2(hw) CoresPerSocket=1:10(hw)
> ThreadsPerCore=1:1(hw)
> slurmd: Message aggregation disabled
> slurmd: debug:  init: Gres GPU plugin loaded
> slurmd: error: Waiting for gres.conf file /dev/nvidia[0-1],CPUs="0-9"
> slurmd: fatal: can't stat gres.conf file /dev/nvidia[0-1],CPUs="0-9": No
> such file or directory
>
>
>
> SLURM version ohpc-17.02.7-61
>
>
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