From: Charles Oliver Nutter <charles.nutter@...>
Date: 2007-11-01T15:16:15+09:00
Subject: Re: JRuby performance questions answered

znmeb@cesmail.net wrote:
> Quoting Charles Oliver Nutter <charles.nutter@sun.com>:
> 
>> Many people believed we'd never be faster than the C implementation,
>> and many still think we're slower. Now that I've set that record
>> straight, any questions?
> 
> 1. How long will it be before Alioth has some *reasonable* numbers for 
> jRuby? As of yesterday, they still have you significantly slower than 
> MRI. So I need to take jRuby out of my slides for RubyConf :) ... I

The current published Alioth numbers are based on JRuby 1.0(ish), which 
was generally 2-3x slower than MRI. I'm hoping the numbers will be 
updated soon after the 1.1 releases...but it probably won't happen until 
1.1 final comes out in December. If someone else wants to re-run them 
for us, it would make us very happy :)

> 2. I haven't actually been benchmarking jRuby recently ... too busy 
> profiling MRI. :)

Well, we know there's still a lot we can do for JRuby 
performance...including not only the 1.9 benchmarks, but a number of 
additional ideas we have that won't affect 1.8 compatibility.

> 3. I'm using the "Pet Store" benchmark for Rails. It's as close to a 
> "real Rails benchmark" as anything I can find.

Yeah, that's what Ola's been using, and we're *real close* to matching 
MRI on that one right now. Still hunting for bottlenecks.

> 4. How's your performance on a SPARC relative to MRI?

Haven't given it a try...I don't have access to a good sparc box at the 
moment (and yes, I know...I work at Sun, so I can have a sparc by 
snapping my fingers...it's a matter of having time to monkey with it).

- Charlie