FileStore 12.11

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Jason Gerard DeRose
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3 Jason Gerard DeRose
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3 Fix Released

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download icon filestore-12.11.0.tar.gz (md5, sig) tarball 10
last downloaded 7 weeks ago
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Release notes 

Added a small C extension with a few functions back-ported from Python 3.3, plus binding to the Linux fallocate() system call. This extension allowed us to:

 * Remove use of /usr/bin/fallocate check_call(), replaced instead with above fallocate() binding

 * Improve read performance by using posix_fadvise()

 * Reduce the queue depth (without really sacrificing throughput), so batch_iter() now has a max of 64 MiB in the queue, down from 128 MiB

On my system, this resulted in a 17% read performance improvement and I'm now getting 31.2 MB/s from a USB2 card reader (actually, it's a USB3 card reader, but plugged into USB2 port). This test was done with a 60 MB/s SanDisk Extreme card, so the limiting factor was definitely USB2.

This is probably about as fast as we're going to get in a read-IO limited situation, but we haven't really tuned things much yet when write-IO limited.


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0 blueprints and 3 bugs targeted

Bug report Importance Assignee Status
824891 #824891 Replace hacky /usr/bin/fallocate subprocess call 3 High Jason Gerard DeRose  10 Fix Released
847048 #847048 fallocate method in filestore assumes the executable is present in /usr/bin/fallocate 3 High Jason Gerard DeRose  10 Fix Released
898957 #898957 Use Python 3.3 os.posix_fadvise() 3 High Jason Gerard DeRose  10 Fix Released
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