From: Charles Oliver Nutter <charles.nutter@...>
Date: 2008-04-03T19:03:23+09:00
Subject: Re: JRuby on OpenVMS works! (slow, though)

synergism wrote:
> I was pleasantly surprised that JRuby works on OpenVMS.  Here's a
> discussion I kicked off on the HP ITRC forums about performance
> concerns:
> 
> http://forums12.itrc.hp.com/service/forums/questionanswer.do?threadId=1218567

I scanned through the discussion, and do have a few suggestions:

- Try various JVM flags to adjust performance...I have no idea what 
they'd be under VMS.
- Try JRuby flags, available by running jruby --properties. Several in 
there, especially "reflection" might improve performance or startup time.
- If you have access to the OpenVMS JVM folks, they might be able to 
point out things we're doing in JRuby that interfere with their Java 
optimizations. For example, the IBM J9 guys warned us against re-using 
the same block of code for exception handled and non-exception-handled 
code paths, which breaks certain optimizations they do.

Performance is very important to us, so please file bugs for anything 
concrete you're able to find.

http://jira.codehaus.org/browse/JRUBY

- Charlie