in reply to Re: Re: Re: Optimizing the bejeezus out of a sub
in thread Optimizing the bejeezus out of a sub

I have a hard time believing that you are really attempting to slice half a second off of your runtime. Results like this are easily attributed to system noise and frankly, I don't think that its worth spending this time on such miniscule results.

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Re: Re: Re: Re: Re: Optimizing the bejeezus out of a sub
by sgifford (Prior) on Jun 24, 2003 at 16:47 UTC

    You're probably right. I'm actually not interested in improving the runtime of this application specifically (most of the application's runtime is from timethis(10000,...)) but rather in making sure that my FTS module is as fast as possible.

    I'm using it to replace another module in several real-world applications, a heavily modified CGI::FastTemplate which has become a little hard to maintain. I was hoping to make FTS as fast as or faster than CGI::FastTemplate so I could replace it with zero reservations, but I don't seem to have succeeded, even with all of the tips offered here (CGI::FastTemplates runs like this on the same data: 

    39 wallclock secs (35.76 usr +  1.93 sys = 37.69 CPU) @ 265.32/s (n=10000)
    ), but I think the extra maintainability is worth the slight slowdown .

    My other goal was to expand my knowledge of how to optimize Perl code, which I definitely did! :-)

[reply]
[d/l]

      The tack I took with BrowserUK requires you first understand perl's VM.

[reply]
        Any pointers on learning more about Perl's virtual machine, apart from the source code?
[reply]

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