[jira] Created: (JRUBY-2811) File opening speed is slower than MRI

File opening speed is slower than MRI
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                 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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