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From "Cristina L. Abad (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-7832) Using mincore to understand the effect of fadvise in the Linux page cache
Date Thu, 17 Nov 2011 20:45:51 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Cristina L. Abad updated HADOOP-7832:
-------------------------------------

    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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