On 7/8/06, Charles O Nutter
<[EMAIL PROTECTED]> wrote:
I'm starting to run some profiles to find real hotspot problems. So here's the first summary of findings.
Profiling: today's code, gem install --force rake (gem cached locally), up to some time during ri generation (killed after an hour)
This profiling run just examined CPU times for various method calls.
Based on "own time" the amount of time spent in each method, there are a few standouts.
- ThreadLocal.get is number one again, accounting for 4% of global execution time. If we modified JRuby such that the current thread's ThreadContext was passed along the call chain we might be able to eliminate much of this overhead. ThreadService.getCurrentContext() and Ruby.getCurrentContext() are ranked #4 and #6 and take another 2% each, adding up to roughly 8% of total execution time spent retrieving the current ThreadContext. EvaluationState.getThreadContext adds another 1%.
- UnsynchronizedStack.peek and ArrayList.size are #2 and #3, certainly owing to our heavy use of UnsynchronizedStack in the core interpreter. Not too surprising, but the more we can eliminate the need for them both the better. They accounted for 6% of execution time. ArrayList.size was invoked 116 million times during my test run.
- EvaluationState.executeNext and EvaluationState.begin take roughly 4% together. A compiler would go a long way toward eliminating these two and a fair portion of the UnsynchronizedStack and ArrayList overhead.
- RubyModule.findImplementer = 6%,
- ThreadContext.pollThreadEvents and methods it calls took up 9% of total time
- ThreadContext.preReflectedMethodInternalCall and callees took up 12%, which is a bit surprising since it doesn't do all that much. A large part of that is pushing a new frame onto the frame stack.
- RubyThread.criticalizeOrDieIfKilled alone was 6%, contributing to pollThreadEvents above
This was using YourKit 5.5.
--
Charles Oliver Nutter @ headius.blogspot.com
JRuby Developer @ www.jruby.org
Application Architect @ www.ventera.com
--
Charles Oliver Nutter @ headius.blogspot.com
JRuby Developer @ www.jruby.org
Application Architect @ www.ventera.com
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