SizeBasedTriggeringPolicy is not effecient enough because of using
File.length() to check the active file size
--------------------------------------------------------------------------------------------------------------
Key: LBCORE-115
URL: http://jira.qos.ch/browse/LBCORE-115
Project: logback-core
Issue Type: Improvement
Components: Rolling
Affects Versions: 0.9.17
Environment: windows, linux
Reporter: tomliliu
Assignee: Logback dev list
Hi,
It looks like SizeBasedTriggeringPolicy is not effecient enough because it will
check active file size by calling File.length(), which will add a fixed
overhead every 16 messages. (The performance definitely has been improved from
0.9.15 to 0.9.17 a lot by checking the file size every 16 message instead of
every messages, we saw 20% overhead cut down on linux local file system.)
We think SizeBasedTriggeringPolicy could work the FileAppender which keep track
of how many bytes has been written through, and it's more efficient to check
the file size based on how many bytes has been written. We also quickly made a
mock up which keeps track of how many bytes written for comparison.
Test Enviornment: Windows XP SP2, Linux 2.4
Test #1: Writing 10 bytes message 1, 000, 000 times. (No rotation happens)
Platform File.length() Tracking bytes written overhead (%)
Windows ~ 12, 200 ms ~ 10, 000 ms 22%
Linux (local) ~ 10, 200 ms ~ 9, 800 ms 4%
Linux (NFS) ~ 37, 700 ms ~ 27, 300 ms 38%
Test #2: Writing 100 bytes messages 1, 000, 000 times. (No rotation happens)
Platform File.length() Tracking bytes written overhead (%)
Windows ~ 14, 000 ms ~ 11, 300 ms 23%
Linux (local) ~ 11, 100 ms ~ 10, 300 ms 7%
Linux (NFS) ~ 414, 600 ms ~366, 300 ms 13%
Could you please consider improve the performance of SizeBasedTriggeringPolicy
so that there is minimal overhead.
Great Thanks,
Tom
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://jira.qos.ch/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira
_______________________________________________
logback-dev mailing list
[email protected]
http://qos.ch/mailman/listinfo/logback-dev
