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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