From: Chuck Remes <cremes.devlist@...>
Date: 2012-01-30T04:20:22+09:00
Subject: Re: perf optimization using profile results

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On Dec 14, 2011, at 7:47 AM, Chuck Remes wrote:

> On Dec 14, 2011, at 2:04 AM, Charles Oliver Nutter wrote:
> 
> 
> Okay, so I should look for lines where I execute "Class.new {}" in my code. Off the top of my head, it is *rare* that I call Class.new directly; it's almost always via an actual class constant name.
> 
>>> I'll take a shot at reducing my object allocation. More information on how many of each type of object is being allocated would be a wonderful statistic to have. Also, if there were a way to trace that allocation back to a particular file and line number (for those cases where the same object is allocated in multiple places), that would be a killer profiling feature. <hint, hint>
>> 
>> Indeed it would. Luckily, the JVM already provides it.
>> [snip]
>> If you find this information useful, perhaps you can reformat it for a
>> JRuby wiki page :)
> 
> I find it *very* useful and I *will* add it to the wiki. Thanks for taking the time to post this!

It took me a while to get around to it, but I added it to the wiki. Check it out here:

https://github.com/jruby/jruby/wiki/Profiling-Object-Allocations

cr


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