File opening speed is slower than MRI
-------------------------------------
Key: JRUBY-2811
URL: http://jira.codehaus.org/browse/JRUBY-2811
Project: JRuby
Issue Type: Bug
Components: Performance
Affects Versions: JRuby 1.1.3
Reporter: Charles Oliver Nutter
Some of this is due to Java libs just having more "open" overhead than e.g.
open(2), but some of it is also excessive logic in our "open" call chain. It's
pretty bad perf either way. Based on bench_io_open.rb in test/bench:
{noformat}
JRuby:
user system total real
File.open(file, "r+") 0.617000 0.000000 0.617000 ( 0.617008)
File.open(file, "r+") 0.608000 0.000000 0.608000 ( 0.608075)
File.open(file, "r+") 0.608000 0.000000 0.608000 ( 0.607263)
File.open(file, "r+") 0.605000 0.000000 0.605000 ( 0.604758)
File.open(file, "r+") 0.601000 0.000000 0.601000 ( 0.600772)
File.open(file, "r+") 0.621000 0.000000 0.621000 ( 0.621210)
File.open(file, "r+") 0.601000 0.000000 0.601000 ( 0.600824)
File.open(file, "r+") 0.602000 0.000000 0.602000 ( 0.601984)
File.open(file, "r+") 0.602000 0.000000 0.602000 ( 0.602048)
File.open(file, "r+") 0.615000 0.000000 0.615000 ( 0.615581)
Ruby:
user system total real
File.open(file, "r+") 0.080000 0.100000 0.180000 ( 0.177464)
File.open(file, "r+") 0.070000 0.090000 0.160000 ( 0.176072)
File.open(file, "r+") 0.070000 0.100000 0.170000 ( 0.179987)
File.open(file, "r+") 0.080000 0.100000 0.180000 ( 0.173712)
File.open(file, "r+") 0.070000 0.100000 0.170000 ( 0.171952)
File.open(file, "r+") 0.070000 0.100000 0.170000 ( 0.173249)
File.open(file, "r+") 0.080000 0.090000 0.170000 ( 0.180945)
File.open(file, "r+") 0.070000 0.100000 0.170000 ( 0.174079)
File.open(file, "r+") 0.070000 0.100000 0.170000 ( 0.178888)
File.open(file, "r+") 0.080000 0.100000 0.180000 ( 0.181685)
{noformat}
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