Re: [tcljava-dev] Prototype Jacl Runtime Compiler

[Bruce J. <nm...@ma...>]

I've found that when developing the code I just released that I had to 
rely on "artificial" benchmarks.  Because most of my real code uses 
constructs such as "foreach", for which the body is not yet compiled, I 
wouldn't see any performance change in "real" code.

Though ultimately any performance optimization scheme is irrelevant if 
it doesn't work well on real code, I'm not sure one can make 
substantial progress if one doesn't use simple benchmarks to understand 
where the performance bottlenecks are.

As with Tom, I found a Java profiler useful  The goal wasn't to try to 
eke out every bit of performance, but just to get some sense of which 
parts of the code were most important to worry about.  I found the new 
profiler in NetBeans ( http://profiler.netbeans.org ) to work well.

Bruce

On Sep 19, 2005, at 4:30 PM, Tom Poindexter wrote:

> On Mon, Sep 19, 2005 at 11:32:15AM -0700, Mo DeJong wrote:
>
>> Tom, what kind of scripts/tools were you using to measure this 1.3 -> 
>> 1.5
>> speed improvement? I have not found much "demo code" that was easy
>> to use with Jacl for the testing runtime performance issues. One 
>> could always
>> write a small loop and use time {...} to measure it, but that does 
>> not really
>
>
> I must confess, most of my timings were mostly artificial.  Since my 
> goal
> was to cache TclParse (and thus TclToken) objects per proc, the tests 
> that
> I used defined one or more procs and invoked those procs in for loops.
> Certainly not real world examples, but good enough to get some 
> preliminary
> results.
>
> I did use a Java profiler, JMP, to get the idea of caching TclParse.  
> I ran
> the Jacl test suite, some of my real code, and some of my contrived
> examples under the profiler.  This gave me the idea for caching 
> TclParse
> objects.
>
> Perhaps TclBench has some tests we can use?
>
>
> -- 
> Tom Poindexter
> tpo...@ny...
> http://www.nyx.net/~tpoindex/
>
>
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Bruce A. Johnson, President
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