Chad Perrin wrote:
-snip-
I'm also not sure the jruby implementation's numbers here are
representative of JRuby's strengths. Does JRuby benefit from the
benefits of Java's optimizing VM for long-running processes?
I know it's probably suffering, in micro-benchmarks, from increased
start-up times as it loads the VM.
JRuby is suffering from being 1.0
"JRuby 1.0 was focused almost entirely on one goal: Ruby 1.8.x
compatibility. ... The next step is making it run as well as possible.
... The heavy lifting for performance and scalability are coming up
..."
Please notice that JRuby is running some of those "micro-benchmarks"
for 2 1/2 hours before dwelling too much on JVM startup-time 
http://shootout.alioth.debian.org/gp4sandbox/benchmark.php?test=all&lang=jruby&lang2=jruby
I'm surprised to see python's median so low. Are these benchmarks
heavy on bytecode-optimized Python, or do they tend to use standard
interpreted Python?
A build and run log is shown for each program:
http://shootout.alioth.debian.org/gp4sandbox/benchmark.php?test=meteor&lang=python&id=2#log
And then there's Psyco
http://shootout.alioth.debian.org/gp4sandbox/benchmark.php?test=all&lang=psyco&lang2=python
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