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https://issues.apache.org/jira/browse/YARN-4768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15199732#comment-15199732
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Nathan Roberts commented on YARN-4768:
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Any comments on this approach?
> 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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