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https://issues.apache.org/jira/browse/HADOOP-7832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cristina L. Abad updated HADOOP-7832:
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Attachment: hadoop-7714-20s-205-mincore.txt
Attached patch that can be applied to 20s (205), after applying Todd's 7714
patch. This is experimental and its purpose is to make it available to anyone
interested in evaluating the effect (on the page cache) of using 7714. This
information (percentage of pages already in page cache) complements
performance-based studies (i.e., studying the impact in job completion time).
> Using mincore to understand the effect of fadvise in the Linux page cache
> -------------------------------------------------------------------------
>
> Key: HADOOP-7832
> URL: https://issues.apache.org/jira/browse/HADOOP-7832
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: io, native, performance
> Reporter: Cristina L. Abad
> Priority: Minor
> Attachments: hadoop-7714-20s-205-mincore.txt
>
>
> This Jira adds a way to log the percentage of pages of a file that were on
> the Linux page cache (when the file is being opened) with the purpose of
> measuring the effect of issuing posix_fadvise (POSIX_FADV_DONTNEED) calls.
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