JRuby

File opening speed is slower than MRI

Details

  • Type: Bug Bug
  • Status: Open Open
  • Priority: Major Major
  • Resolution: Unresolved
  • Affects Version/s: JRuby 1.1.3
  • Fix Version/s: None
  • Component/s: Performance
  • Labels:
    None
  • Number of attachments :
    0

Description

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:

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)

Activity

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Charles Oliver Nutter added a comment -

Still valid; slightly improved since it was filed, though.

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Charles Oliver Nutter added a comment - Still valid; slightly improved since it was filed, though.
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Charles Oliver Nutter added a comment -

Latest results show us only about 2x slower than MRI, so we're pretty close now.

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Charles Oliver Nutter added a comment - Latest results show us only about 2x slower than MRI, so we're pretty close now.
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Ivo Wever added a comment -

It seems there has been a regression here. JRuby 1.4.1 is consistently around 5% faster than 1.5.6 on my system. MRI is a factor 9 faster still. I left 1.2.0 out, but it was consistently slower than 1.4.1.

ruby -v bench/bench_io_open.rb
ruby 1.8.7 (2010-04-19 patchlevel 253) [x86_64-linux], MBARI 0x6770, Ruby Enterprise Edition 2010.02
Rehearsal ---------------------------------------------------------
File.open(file, "r+")   0.030000   0.020000   0.050000 (  0.060564)
File.open(file, "r+")   0.030000   0.020000   0.050000 (  0.061693)
File.open(file, "r+")   0.020000   0.040000   0.060000 (  0.062378)
File.open(file, "r+")   0.040000   0.010000   0.050000 (  0.060962)
File.open(file, "r+")   0.040000   0.010000   0.050000 (  0.061521)
File.open(file, "r+")   0.040000   0.010000   0.050000 (  0.062309)
File.open(file, "r+")   0.040000   0.010000   0.050000 (  0.062137)
File.open(file, "r+")   0.040000   0.010000   0.050000 (  0.061564)
File.open(file, "r+")   0.050000   0.010000   0.060000 (  0.061476)
File.open(file, "r+")   0.030000   0.020000   0.050000 (  0.062032)
------------------------------------------------ total: 0.520000sec

~/bin/jruby-1.4.1/bin/jruby -v bench/bench_io_open.rb
jruby 1.4.1 (ruby 1.8.7 patchlevel 174) (2010-04-26 ea6db6a) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_20) [amd64-java]
Rehearsal ---------------------------------------------------------
File.open(file, "r+")   1.090000   0.000000   1.090000 (  1.041000)
File.open(file, "r+")   0.832000   0.000000   0.832000 (  0.831000)
File.open(file, "r+")   0.743000   0.000000   0.743000 (  0.743000)
File.open(file, "r+")   0.292000   0.000000   0.292000 (  0.292000)
File.open(file, "r+")   0.339000   0.000000   0.339000 (  0.340000)
File.open(file, "r+")   0.261000   0.000000   0.261000 (  0.261000)
File.open(file, "r+")   0.313000   0.000000   0.313000 (  0.313000)
File.open(file, "r+")   0.248000   0.000000   0.248000 (  0.248000)
File.open(file, "r+")   0.305000   0.000000   0.305000 (  0.305000)
File.open(file, "r+")   0.241000   0.000000   0.241000 (  0.241000)
------------------------------------------------ total: 4.664000sec

~/bin/jruby-1.5.6/bin/jruby -v bench/bench_io_open.rb
jruby 1.5.6 (ruby 1.8.7 patchlevel 249) (2010-12-03 9cf97c3) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_20) [amd64-java]
Rehearsal ---------------------------------------------------------
File.open(file, "r+")   1.159000   0.000000   1.159000 (  1.103000)
File.open(file, "r+")   0.940000   0.000000   0.940000 (  0.939000)
File.open(file, "r+")   0.627000   0.000000   0.627000 (  0.628000)
File.open(file, "r+")   0.409000   0.000000   0.409000 (  0.409000)
File.open(file, "r+")   0.384000   0.000000   0.384000 (  0.384000)
File.open(file, "r+")   0.267000   0.000000   0.267000 (  0.267000)
File.open(file, "r+")   0.306000   0.000000   0.306000 (  0.306000)
File.open(file, "r+")   0.254000   0.000000   0.254000 (  0.254000)
File.open(file, "r+")   0.340000   0.000000   0.340000 (  0.340000)
File.open(file, "r+")   0.254000   0.000000   0.254000 (  0.254000)
------------------------------------------------ total: 4.939999sec
Show
Ivo Wever added a comment - It seems there has been a regression here. JRuby 1.4.1 is consistently around 5% faster than 1.5.6 on my system. MRI is a factor 9 faster still. I left 1.2.0 out, but it was consistently slower than 1.4.1. ruby -v bench/bench_io_open.rb ruby 1.8.7 (2010-04-19 patchlevel 253) [x86_64-linux], MBARI 0x6770, Ruby Enterprise Edition 2010.02 Rehearsal --------------------------------------------------------- File.open(file, "r+") 0.030000 0.020000 0.050000 ( 0.060564) File.open(file, "r+") 0.030000 0.020000 0.050000 ( 0.061693) File.open(file, "r+") 0.020000 0.040000 0.060000 ( 0.062378) File.open(file, "r+") 0.040000 0.010000 0.050000 ( 0.060962) File.open(file, "r+") 0.040000 0.010000 0.050000 ( 0.061521) File.open(file, "r+") 0.040000 0.010000 0.050000 ( 0.062309) File.open(file, "r+") 0.040000 0.010000 0.050000 ( 0.062137) File.open(file, "r+") 0.040000 0.010000 0.050000 ( 0.061564) File.open(file, "r+") 0.050000 0.010000 0.060000 ( 0.061476) File.open(file, "r+") 0.030000 0.020000 0.050000 ( 0.062032) ------------------------------------------------ total: 0.520000sec ~/bin/jruby-1.4.1/bin/jruby -v bench/bench_io_open.rb jruby 1.4.1 (ruby 1.8.7 patchlevel 174) (2010-04-26 ea6db6a) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_20) [amd64-java] Rehearsal --------------------------------------------------------- File.open(file, "r+") 1.090000 0.000000 1.090000 ( 1.041000) File.open(file, "r+") 0.832000 0.000000 0.832000 ( 0.831000) File.open(file, "r+") 0.743000 0.000000 0.743000 ( 0.743000) File.open(file, "r+") 0.292000 0.000000 0.292000 ( 0.292000) File.open(file, "r+") 0.339000 0.000000 0.339000 ( 0.340000) File.open(file, "r+") 0.261000 0.000000 0.261000 ( 0.261000) File.open(file, "r+") 0.313000 0.000000 0.313000 ( 0.313000) File.open(file, "r+") 0.248000 0.000000 0.248000 ( 0.248000) File.open(file, "r+") 0.305000 0.000000 0.305000 ( 0.305000) File.open(file, "r+") 0.241000 0.000000 0.241000 ( 0.241000) ------------------------------------------------ total: 4.664000sec ~/bin/jruby-1.5.6/bin/jruby -v bench/bench_io_open.rb jruby 1.5.6 (ruby 1.8.7 patchlevel 249) (2010-12-03 9cf97c3) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_20) [amd64-java] Rehearsal --------------------------------------------------------- File.open(file, "r+") 1.159000 0.000000 1.159000 ( 1.103000) File.open(file, "r+") 0.940000 0.000000 0.940000 ( 0.939000) File.open(file, "r+") 0.627000 0.000000 0.627000 ( 0.628000) File.open(file, "r+") 0.409000 0.000000 0.409000 ( 0.409000) File.open(file, "r+") 0.384000 0.000000 0.384000 ( 0.384000) File.open(file, "r+") 0.267000 0.000000 0.267000 ( 0.267000) File.open(file, "r+") 0.306000 0.000000 0.306000 ( 0.306000) File.open(file, "r+") 0.254000 0.000000 0.254000 ( 0.254000) File.open(file, "r+") 0.340000 0.000000 0.340000 ( 0.340000) File.open(file, "r+") 0.254000 0.000000 0.254000 ( 0.254000) ------------------------------------------------ total: 4.939999sec

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  • Assignee:
    Unassigned
    Reporter:
    Charles Oliver Nutter
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Dates

  • Created:
    Updated: