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From "Manu Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7832) Using mincore to understand the effect of fadvise in the Linux page cache
Date Wed, 04 Sep 2013 01:05:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13757350#comment-13757350
] 

Manu Zhang commented on HADOOP-7832:
------------------------------------

Thanks Cristina. I've applied all the patches in HADOOP-7714 and resolve conflicts when applying
them. I can see some "Loaded file ... 100.0% of its 4k pages where found in OS page cache"
(TaskTracker) but the "ENOMEM" WARN still happens. But not between "Loaded block..." (BlockSender).
BTW, where should I look for "Loaded IFile..."?
                
> 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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