I just committed a change to the JRuby startup scripts that boosts
startup speed by almost 70% (for me). It loads the JRuby jars (and
CLASSPATH) into bootclasspath instead of normal classpath, bypassing
verification (and apparently other things, since this is way faster than
-Xverify:none). It should also be a safe change; JRuby's core should
have been verified a kajillion times before release, and code generated
at runtime will be verified as normal.
I've been informed Scala does this as well to speed up their launcher.
Please give it a try with your apps. I'm going to make a small
modification so that jars in JRuby's lib are the only ones put in
bootclasspath, to prevent third-party jars from bypassing verification
as easily, but it won't change general startup time.
http://pastie.org/190150
It is a good day :)
- Charlie
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