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Re: Lies, Damn Lies and Benchmarks

by Aristotle (Chancellor)
on Mar 24, 2004 at 20:08 UTC ( #339534=note: print w/replies, xml ) Need Help??

in reply to Lies, Damn Lies and Benchmarks

If you run your code under warnings, Perl complains about Odd number of elements in hash assignment. Nothing unexpected. But if you benchmark just one of the versions at a time, there's an interesting nugget to be found.

The list bench is predictable and boring. The screen fills with warnings emitted at a constant rate.

But the shift benchmark exhibits a rather inexplicable pattern. The fact that the warnings eventually stop is easy to understand: modifying the caller's @_ is a sideeffect that persists across iterations. What is really strange is that the warnings are emitted at progressively slower rate.

Why? I don't know. I clawed around in the bowels of briefly but didn't find it very pleasant to read, so I gave up. Maybe someone more motivated than me wants to pick up this riddle.

Makeshifts last the longest.

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[Your Mother]: Das right.
[Eily]: actually I forgot to provide the filename as a parameter
LanX it reeks.
[Your Mother]: You know what they say, the reeky wheel gets the best price at cheese market.
[Eily]: well I had to google translate that
[Eily]: let me inform you that the Dutch reek translate into the Czech páchnout
[Eily]: very useful default translation :P
[Eily]: BTW LanX, you should try typing a few random chars at the beginning of each message. This will prevent expansion :P
[LanX]: qwiud you sthink so?
[LanX]: zxwqbd good idea! :)

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