rsync - Dec 2009 - DO NOT REPLY [Bug 7004] New: Use posix_fadvise to free cached file contents when done

https://bugzilla.samba.org/show_bug.cgi?id=7004

           Summary: Use posix_fadvise to free cached file contents when done
           Product: rsync
           Version: 3.0.6
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P3
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: ted at midg3t.net
         QAContact: rsync-qa at samba.org


It would be good if rsync used posix_fadvise with POSIX_FADV_DONTNEED to notify
the kernel when it no longer needs file contents that have been synced to
prevent useful cache contents being dropped in favor of never-reused rsynced
files.

Tobias Oetiker wrote a patch & documentation about this:
  http://insights.oetiker.ch/linux/fadvise.html


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------- Comment #1 from bgamari at gmail.com  2010-11-03 07:54 CST -------
What is the status of this? Grepping the source for fadvise turns up nothing.
It seems the patch has even been ported up to 3.0.7 [1]

[1] http://tobi.oetiker.ch/patches/rsync-3.0.7-fadvise.patch


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wayned at samba.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX




------- Comment #2 from wayned at samba.org  2010-11-06 11:03 CST -------
I don't feel this patch is general enough nor straight-forward enough to
make
it into rsync.  It would be better for someone to write a a pre-load library
that could be used with any copy program rather than putting this into rsync.


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--- Comment #3 from Arkadiusz Miskiewicz <arekm at maven.pl> ---
The rsync filling up kernel cache is a problem on bigger backup servers. These
days POSIX_FADV_DONTNEED is commonly implemented in unix systems.

Anyway as temporary/not optimal workaround: https://github.com/Feh/nocache (if
not wanting to patch rsync).

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