This should go up on a blog post

On Mon, Apr 15, 2013 at 2:09 PM, mojavelinux [via Asciidoctor :: Discussion] <[hidden email]> wrote:

For small tasks, such as converting an AsciiDoc document, there are certain flags you can enable for JRuby and Java that make it startup much, much faster, esp when invoked via Java (like 3x as fast). The trade-off is that you are disabling optimizations that impact long-running processes, but...exactly, we don't need them.

Here's the set of flags I've worked out thus far:

-Djruby.compat.version=RUBY1_9 -Djruby.compile.mode=OFF -XX:+TieredCompilation -XX:TieredStopAtLevel=1 -Xverify:none

Here's an example of making a simple JRuby call without these flags:

time jruby -e 'puts "Hello, World!"'

real 0m1.170s

user 0m1.966s

sys 0m0.078s

Now I'll add these flags,

export JRUBY_OPTS="-Djruby.compat.version=RUBY1_9 -Djruby.compile.mode=OFF -XX:+TieredCompilation -XX:TieredStopAtLevel=1 -Xverify:none"

and call the same script again:

time jruby -e 'puts "Hello, World!"'

real 0m0.090s

user 0m0.070s

sys 0m0.021s

That certainly speeds things up.

Now, I'll execute the generate-resources goal in Maven to invoke the Asciidoctor Maven plugin, first without any flags:

real 0m7.361s

user 0m14.733s

sys 0m0.297s

Now I'll add the flags. The only way I can figure out to pass these flags to JRuby is to set them as Maven options:

real 0m3.310s

user 0m4.537s

sys 0m0.260s

Voila! I think that will certainly save a lot of waiting :)

If anyone knows:

a. Flags that can make it go even faster

b. How to pass flags to JRuby w/o having to apply them to Maven globally

please let us know!

-Dan

--

Dan Allen

Principal Software Engineer, Red Hat | Author of Seam in Action
Registered Linux User #231597

http://google.com/profiles/dan.j.allen
http://mojavelinux.com
http://mojavelinux.com/seaminaction

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NAML

--

Jason Porter
http://en.gravatar.com/lightguardjp

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