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From "Kevin Klues (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MESOS-6383) NvidiaGpuAllocator::resources cannot load symbol nvmlGetDeviceMinorNumber - can the device minor number be ascertained reliably using an older set of API calls?
Date Tue, 18 Oct 2016 16:07:58 GMT

    [ https://issues.apache.org/jira/browse/MESOS-6383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15585846#comment-15585846
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Kevin Klues commented on MESOS-6383:
------------------------------------

Hi Dylan,

Thanks for reporting this.  I see the problem, but it's not immediately clear to me what the
solution would be.  We don't want to just parse the output of {{nvidia-smi}} because that
also changes from version to version (we talked with Nvidia directly about this, and they
*highly* discouraged trying to rely on the output of {{nvidia-smi}}).

One thing I could imagine doing is to change the code that attempts to load the {{nvmlDeviceGetMinorNumber}}
symbol from NVML.  It could attempt to load the symbol, and if it failed, it would fall back
to implementing our wrapper function for {{nvml::deviceGetMinorNumber()}} using a different
method (meaning there would be no changes to {{NvidiaGpuAllocator}}. Do you know what (if
any) methods were available in the 5.319 driver to determine the minor number? How does the
old {{nvidia-smi}} determine them?

Also, are you sure this is the only symbol we aren't able to load from the old driver, or
did you just hit this one first?

> NvidiaGpuAllocator::resources cannot load symbol nvmlGetDeviceMinorNumber - can the device
minor number be ascertained reliably using an older set of API calls?
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MESOS-6383
>                 URL: https://issues.apache.org/jira/browse/MESOS-6383
>             Project: Mesos
>          Issue Type: Improvement
>    Affects Versions: 1.0.1
>            Reporter: Dylan Bethune-Waddell
>            Priority: Minor
>              Labels: gpu
>
> We're attempting to deploy Mesos on a cluster with 2 Nvidia GPUs per host. We are not
in a position to upgrade the Nvidia drivers in the near future, and are currently at driver
version 319.72
> When attempting to launch an agent with the following command and take advantage of Nvidia
GPU support (master address elided):
> bq. {{./bin/mesos-agent.sh --master=<masterIP>:<masterPort> --work_dir=/tmp/mesos
--isolation="cgroups/devices,gpu/nvidia"}}
> I receive the following error message:
> bq. {{Failed to create a containerizer: Failed call to NvidiaGpuAllocator::resources:
Failed to nvml::initialize: Failed to load symbol 'nvmlDeviceGetMinorNumber': Error looking
up symbol 'nvmlDeviceGetMinorNumber' in 'libnvidia-ml.so.1' : /usr/lib64/libnvidia-ml.so.1:
undefined symbol: nvmlDeviceGetMinorNumber}}
> Based on the change log for the NVML module, it seems that {{nvmlDeviceGetMinorNumber}}
is only available for driver versions 331 and later as per info under the [Changes between
NVML v5.319 Update and v331|http://docs.nvidia.com/deploy/nvml-api/change-log.html#change-log]
heading in the NVML API reference.
> Is there is an alternate method of obtaining this information at runtime to enable support
for older versions of the Nvidia driver? Based on discussion in the design document, obtaining
this information from the {{nvidia-smi}} command output is a feasible alternative. 
> I am willing to submit a PR that amends the behaviour of {{NvidiaGpuAllocator}} such
that it first attempts calls to {{nvml::nvmlGetDeviceMinorNumber}} via libnvidia-ml, and if
the symbol cannot be found, falls back on {{--nvidia-smi="/path/to/nvidia-smi"}} option obtained
from mesos-agent if provided or attempts to run {{nvidia-smi}} if found on path and parses
the output to obtain this information. Otherwise, raise an exception indicating all this was
attempted.
> Would a function or class for parsing {{nvidia-smi}} output be a useful contribution?



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