Giovanni Cristelli created JRUBY-6352:
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Summary: Slow startup of an executable jar created with warbler
(rubygems problem ?)
Key: JRUBY-6352
URL: https://jira.codehaus.org/browse/JRUBY-6352
Project: JRuby
Issue Type: Bug
Components: Performance
Affects Versions: JRuby 1.6.5, JRuby 1.6.6
Environment: Ubuntu 11.4 Linux 2.6.38 64bit
Reporter: Giovanni Cristelli
I've found that changing only the jruby version (from 1.6.4 to 1.6.5 or
1.6.6dev) and rebuilding the executable jar for my application using warbler
1.3.3, the startup time for loading all required gems is 1.5x slower with 1.6.5
and more than 6x times slower with 1.6.6dev (from 30 seconds with 1.6.4 to more
than 2 minutes with 1.6.6).
The command used to execute the application is
{{java -jar myapp.jar}}
and I've tried other combinations for the -server/-client flag and 1.8/1.9
compatibility mode, adding the options Djruby.memory.max=512m
-Djruby.stack.max=2048k -Xmx512m -Xss2048k, but the results are more or less
the same.
If I launch the application not using the jar but using the jruby command, the
startup time is the same for all the 3 versions.
The application at startup requires many gems and I've tried to debug the
problem enabling the option -Djruby.debug.loadService.timing and the result is
that from a certain point requiring a gem is slower (the output in 1.6.4 is
continuous while in 1.6.5/ 1.6.6 pauses for a while when a new require is
executed).
In the debug output (with more than 1000 lines beginning with ->) for example,
the require net/ldap timing is:
1.6.6dev:
{noformat}
-> net/ldap
...
<- bouncy-castle-java - 1634ms
<- jopenssl - 2024ms
<- openssl.rb - 7830ms
<- jruby/openssl/gem - 8856ms
<- jruby/openssl/builtin - 9274ms
<- jruby/openssl/stub - 9701ms
<- openssl - 9701ms
<- net/ber/core_ext - 2533ms
<- net/ber - 2747ms
<- net/ldap - 16639ms
{noformat}
1.6.5:
{noformat}
-> net/ldap
...
<- bcprov-jdk15-146.jar - 1052ms
<- bouncy-castle-java - 1692ms
<- jopenssl - 2629ms
<- openssl.rb - 4892ms
<- jruby/openssl/gem - 4966ms
<- jruby/openssl/builtin - 5007ms
<- jruby/openssl/stub - 5072ms
<- openssl - 5072ms
<- net/ldap - 5642ms
{noformat}
1.6.4:
{noformat}
-> net/ldap
...
<- bouncy-castle-java - 1694ms
<- jopenssl - 1663ms
<- openssl.rb - 3560ms
<- jruby/openssl/gem - 3591ms
<- jruby/openssl/builtin - 3599ms
<- jruby/openssl/stub - 3607ms
<- openssl - 3607ms
<- net/ldap - 3794ms
{noformat}
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