Ben Armstrong created JRUBY-6448:
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Summary: OpenVMS: Drastically poor startup time with
-Xbootclasspath append instead of prepend
Key: JRUBY-6448
URL: https://jira.codehaus.org/browse/JRUBY-6448
Project: JRuby
Issue Type: Bug
Components: Launcher
Affects Versions: JRuby 1.6.6
Environment: OpenVMS/Alpha, JRE 1.5
Reporter: Ben Armstrong
Assignee: Thomas E Enebo
For some reason, JRuby on OpenVMS/Alpha which has JRE 1.5 (and no prospects for
future higher versions), wastes quite a lot of resources at startup time. This
makes it painful to start on this platform (up to 15 seconds!)
Close analysis shows the time is wasted in a lot of failed directory scans. And
it turns out that if you change from -Xbootclasspath/a jruby.jar to
-Xbootclasspath/p, i.e. from append to prepend, the problem goes away.
My question, since /a is borrowed from the jruby.sh launcher (though I am not
currently using that component), is whether there is some good reason /a is
used here instead of /p? Would other platforms realize a startup time
improvement if it were changed?
Here is my thread on the HP OpenVMS support forums about the issue:
http://h30499.www3.hp.com/t5/Languages-and-Scripting/Slow-Java-startup-Alpha-vs-I64-excessive-directory-scans-vanilla/m-p/5549799
Thanks,
Ben
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