[jira] [Commented] (FLINK-3163) Configure Flink for NUMA systems

["Stephan Ewen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15056472#comment-15056472 ] 

Stephan Ewen commented on FLINK-3163:
-------------------------------------

Very interesting idea. Can this logic be generically added to the start and stop scripts?

Does it make sense to think about integrating this with the YARN node launching as well?

> Configure Flink for NUMA systems
> --------------------------------
>
>                 Key: FLINK-3163
>                 URL: https://issues.apache.org/jira/browse/FLINK-3163
>             Project: Flink
>          Issue Type: Improvement
>          Components: Start-Stop Scripts
>    Affects Versions: 1.0.0
>            Reporter: Greg Hogan
>            Assignee: Greg Hogan
>
> On NUMA systems Flink can be pinned to a single physical processor ("node") using {{numactl --membind=$node --cpunodebind=$node <command>}}. Commonly available NUMA systems include the largest AWS and Google Compute instances.
> For example, on an AWS c4.8xlarge system with 36 hyperthreads the user could configure a single TaskManager with 36 slots or have Flink create two TaskManagers bound to each of the NUMA nodes, each with 18 slots.
> There may be some extra overhead in transferring network buffers between TaskManagers on the same system, though the fraction of data shuffled in this manner decreases with the size of the cluster. The performance improvement from only accessing local memory looks to be significant though difficult to benchmark.
> The JobManagers may fit into NUMA nodes rather than requiring full systems.



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