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Posted to common-issues@hadoop.apache.org by "Manu Zhang (JIRA)" <ji...@apache.org> on 2013/09/03 10:28:53 UTC

[jira] [Commented] (HADOOP-7832) Using mincore to understand the effect of fadvise in the Linux page cache

    [ https://issues.apache.org/jira/browse/HADOOP-7832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756449#comment-13756449 ] 

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

Hi, could the patch be applied to 1.0.3 since I get a "ENOMEM: Cannot allocate memory" from mincore?
                
> 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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