#readahead-list (1:1.20060421.1016-5) unstable; urgency=low # # * Allow to run in the background, see README.Debian (Closes: #481369) #
package readahead-list readahead tags 481369 + pending thanks On Tue, Sep 30, 2008 at 12:49:18PM +0200, Guus Sliepen wrote: > On Mon, 02 Jun 2008 10:53:33 +0100, Scott James Remnant wrote: > > > Running it in the background would mean you were seeking the disk all > > over the shop, > > On a solid state disk (CompactFlash, USB stick or otherwise), there is no > overhead due to seeking. For rotating disks the kernel uses an elevator > algorithm that minimises the amount of seeking necessary. This elevator > > > and attempting to readahead pages that were already read > > by an application running in parallel. > > That is not a problem at all, the pages won't be read twice, the readahead > will > just be a no-op since the pages are already in memory, and readahead-list will > then just continue with the next file. > > > Likewise ioniceing readahead is basically moronic. > > If you run it in the foreground, it doesn't make a difference. If you run > readahead-list in the background it will. Unless readahead-list really I have read you arguments, and I see no reason to not provide an option to enable such a behavior. See commit f0eab721c81c7810f69db8b30cc9b861cdab1f38, e.g. using gitweb: http://git.debian.org/?p=collab-maint/readahead-list.git;a=commit;h=f0eab72 from README.Debian ================== Running in background --------------------- If you want to run readahead-list in background, enable RUN_IN_BACKGROUND=true in /etc/default/readahead. This may be useful for medias without high seek times (e.g. SSD). When enabled, readahead-list will be running at idle priority, so the boot will not slow down. -- Julian Andres Klode - Free Software Developer Debian Developer - Contributing Member of SPI Ubuntu Member - Fellow of FSFE Website: http://jak-linux.org/ XMPP: [email protected] Debian: http://www.debian.org/ SPI: http://www.spi-inc.org/ Ubuntu: http://www.ubuntu.com/ FSFE: http://www.fsfe.org/
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