Oh, another item I forgot to mention:
* For 1.4 release, we should remove org.jruby.compiler.ir subpackage,
since it's not referenced or functional yet.
The uncompressed classes are about 600kb.
- Charlie
On Fri, Oct 9, 2009 at 11:18 PM, Charles Oliver Nutter
<head...@headius.com> wrote:
> I had a few ideas for shrinking the JRuby jar file. Some are generally
> useful, like for JRuby dist, but others are only useful for specific
> cases uses. Wanted to get your input on them:
>
> * Group multiple invokers into single classes or generate switch-based
> invokers for non-perf-critical cases
> * Share a single invoker for all subclass overrides of a superclass
> method (like only generate a single to_s invoker against
> RubyBasicObject). This could impact inlining potential since a single
> invoker will handle multiple target methods (where right now, inlining
> through an invoker is easy).
> * Remove all invokers and populators and run on reflected or
> lazily-generated invokers
>
> Anything that reduces the number of invoker classes can be a big help.
> The invoker classes, one per core class Ruby method, consume almost
> 1.5MB in the compressed jar file.
>
> * Remove debugging symbols from all .class files (other than line
> number info). Obfuscate private methods and classes to short names.
>
> Some libraries do both of these to reduce the size of their shipped
> binaries. The former would not damage stack traces, but the latter
> obviously would.
>
> * Remove 1.9 or 1.8-only stuff and ship a single-version jar
>
> With our move to 1.8.7, this isn't as helpful, but it could eliminate
> some of the invokers that don't get used.
>
> * Remove native libraries and anything that requires them when
> shipping to secured environments like applets or GAE
> * Remove native libs for other platforms and only ship a specific one
> (applicable more for applications targeting a specific platform)
>
> Removing all the native libs shrinks the compressed jar by about 250KB
> or so. Our move away from JNA has helped here too.
>
> * Compress the jruby.jar and jruby-complete.jar with pack200. In
> jruby.jar's case, unpack it the first time bin/jruby is run
>
> Here's the packed sizes of jruby.jar and jruby-complete.jar with no
> other modifications:
>
> -rw-r--r-- 1 headius staff 10432321 Oct 9 23:26 jruby-complete.jar
> -rw-r--r-- 1 headius staff 3975247 Oct 9 23:26 jruby-complete.pack.gz
> -rw-r--r-- 1 headius staff 8028709 Oct 9 23:18 jruby.jar
> -rw-r--r-- 1 headius staff 2140319 Oct 9 23:23 jruby.pack.gz
>
> So doing this would shrink JRuby's full dist by over 8.3MB. It's worth
> noting that applets support pack200 too, so anyone shipping JRuby as
> an applet should try to use pack200.
>
> * Use jarjar or some other tool to strip out classes we don't use,
> like extra classes from joda, asm, and so on.
>
> Some of the classes will be difficult to accurately remove due to
> reflection effects, but there could be a great untold savings.
>
> - Charlie
>
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