Charles Oliver Nutter created JRUBY-6292:
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Summary: Massive perf degradation in pack after ByteList update
Key: JRUBY-6292
URL: https://jira.codehaus.org/browse/JRUBY-6292
Project: JRuby
Issue Type: Bug
Reporter: Charles Oliver Nutter
Assignee: Thomas E Enebo
I'm not sure if this was from Tom's changes or from mine, but #pack performance
has degraded almost two orders of magnitude as a result.
Using Chuck Remes's benchmark from JRUBY-6221:
{noformat}
jruby-1.6.5 (and numbers on master were similar recently):
user system total real
fast generate: 2.028000 0.000000 2.028000 ( 2.028000)
pack: 0.228000 0.000000 0.228000 ( 0.228000)
parse: 3.094000 0.000000 3.094000 ( 3.094000)
unpack: 0.208000 0.000000 0.208000 ( 0.208000)
jruby master (now):
user system total real
fast generate: 0.000000 0.000000 0.000000 ( 0.000000)
pack: 16.308000 0.000000 16.308000 ( 16.308000)
parse: 0.000000 0.000000 0.000000 ( 0.000000)
unpack: 0.000000 0.000000 0.000000 ( 0.000000)
{noformat}
A sample profile (with inlining turned off, to avoid clouding the results)
shows the following:
{noformat}
Compiled + native Method
88.1% 0 + 8539 org.jruby.util.ByteList.grow
7.8% 753 + 0 org.jruby.util.ByteList.append
0.4% 39 + 0 org.jruby.util.ByteList.<init>
{noformat}
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