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https://issues.apache.org/jira/browse/HADOOP-7832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13152311#comment-13152311
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Cristina L. Abad commented on HADOOP-7832:
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Sample output (datanode log):
Loaded block blk_4719017558826481280_1001; 86.42578% of its 4K pages were found
in OS page cache.
And in tasktracker log (for intermediate files):
Loaded file
taskTracker/cabad/jobcache/job_201110251606_0004/attempt_201110251606_0004_m_000000_0/output/file.out;
100.0% of its 4K pages were found in OS page cache.
> 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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