FileStore 12.11
Milestone information
- Project:
- FileStore
- Series:
- trunk
- Version:
- 12.11
- Released:
- Registrant:
- Jason Gerard DeRose
- Release registered:
- Active:
- No. Drivers cannot target bugs and blueprints to this milestone.
Activities
- Assigned to you:
- No blueprints or bugs assigned to you.
- Assignees:
- 3 Jason Gerard DeRose
- Blueprints:
- No blueprints are targeted to this milestone.
- Bugs:
- 3 Fix Released
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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.
Changelog
This release does not have a changelog.
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 | |
