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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8431) Allow to specify # GPUs for TaskManager in Mesos
Date Fri, 19 Jan 2018 02:24:03 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16331637#comment-16331637
] 

ASF GitHub Bot commented on FLINK-8431:
---------------------------------------

Github user eastcirclek commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5307#discussion_r162524332
  
    --- Diff: flink-mesos/src/main/java/org/apache/flink/mesos/runtime/clusterframework/MesosTaskManagerParameters.java
---
    @@ -238,6 +254,16 @@ public static MesosTaskManagerParameters create(Configuration flinkConfig)
{
     			cpus = Math.max(containeredParameters.numSlots(), 1.0);
     		}
     
    +		double gpus = flinkConfig.getDouble(MESOS_RM_TASKS_GPUS, 0.0);
    +		if (gpus < 0) {
    +			throw new IllegalConfigurationException(MESOS_RM_TASKS_GPUS.key() +
    +				" cannot be negative");
    +		}
    +		if (gpus % 1 != 0) {
    --- End diff --
    
    I tested that `(1.000000000000001 % 1) != 0` is true while `(1.0000000000000001 % 1) !=
0` is false.


> Allow to specify # GPUs for TaskManager in Mesos
> ------------------------------------------------
>
>                 Key: FLINK-8431
>                 URL: https://issues.apache.org/jira/browse/FLINK-8431
>             Project: Flink
>          Issue Type: Improvement
>          Components: Cluster Management, Mesos
>            Reporter: Dongwon Kim
>            Assignee: Dongwon Kim
>            Priority: Minor
>
> Mesos provides first-class support for Nvidia GPUs [1], but Flink does not exploit it
when scheduling TaskManagers. If Mesos agents are configured to isolate GPUs as shown in [2],
TaskManagers that do not specify to use GPUs cannot see GPUs at all.
> We, therefore, need to introduce a new configuration property named "mesos.resourcemanager.tasks.gpus"
to allow users to specify # of GPUs for each TaskManager process in Mesos.
> [1] http://mesos.apache.org/documentation/latest/gpu-support/
> [2] http://mesos.apache.org/documentation/latest/gpu-support/#agent-flags



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