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From "Cristina L. Abad (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7832) Using mincore to understand the effect of fadvise in the Linux page cache
Date Thu, 17 Nov 2011 20:53:51 GMT

    [ 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:
------------------------------------------

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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