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Posted to yarn-issues@hadoop.apache.org by "Eric Payne (JIRA)" <ji...@apache.org> on 2016/05/09 19:14:12 UTC
[jira] [Commented] (YARN-4768) getAvailablePhysicalMemorySize can
be inaccurate on linux
[ https://issues.apache.org/jira/browse/YARN-4768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15276849#comment-15276849 ]
Eric Payne commented on YARN-4768:
----------------------------------
bq. "Inactive(file)" would seem more accurate but it's not available in all kernel versions. To keep things simple, maybe just use "Inactive(file)" if available, otherwise fallback to "Inactive".
Sounds reasonable. I'll take a look at the patch.
> getAvailablePhysicalMemorySize can be inaccurate on linux
> ---------------------------------------------------------
>
> Key: YARN-4768
> URL: https://issues.apache.org/jira/browse/YARN-4768
> Project: Hadoop YARN
> Issue Type: Bug
> Components: nodemanager
> Affects Versions: 3.0.0, 2.7.2
> Environment: Linux
> Reporter: Nathan Roberts
> Assignee: Nathan Roberts
> Attachments: YARN-4768.patch
>
>
> Algorithm currently uses "MemFree" + "Inactive" from /proc/meminfo
> "Inactive" may not be a very good indication of how much memory can be readily freed because it contains both:
> - Pages mapped with MAP_SHARED|MAP_ANONYMOUS (regardless of whether they're being actively accessed or not. Unclear to me why this is the case...)
> - Pages mapped MAP_PRIVATE|MAP_ANONYMOUS that have not been accessed recently
> Both of these types of pages probably shouldn't be considered "Available".
> "Inactive(file)" would seem more accurate but it's not available in all kernel versions. To keep things simple, maybe just use "Inactive(file)" if available, otherwise fallback to "Inactive".
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