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Re: Re: Re: Re: writing looped programs

by count0 (Friar)
on Jan 29, 2002 at 08:52 UTC ( #142286=note: print w/replies, xml ) Need Help??


in reply to Re: Re: Re: writing looped programs
in thread writing looped programs

But if we're talking about a loop, this memory conservation only exists in the first iteration of it.
while (1) { # during the first iteration, no variables have been # declared yet. # However, if we're in the 2nd, 3rd, etc loop.. # that 3ish KB of memory allocated for $variable # still belong to Perl, and are most likely not yet # free()'ed sleep 10; # Create roughly 3 KB { my $variable = 'foo' x 1024; } }

So you see... we conserve memory for an extra 10 seconds (the first 10 seconds of this code's execution)... but that's it. After that, Perl holds on to that memory created for $variable... even when $variable goes out of scope. So the position of the sleep really makes no real difference.

Anyway, these sorts of attempts at micro-optimizations usually prove to be futile, as Perl does a great job of it on its own. =)

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[choroba]: What about [metadoc:// Algorithm::Loops]?
[Corion]: choroba: Yeah, but handing off the request to Dancer,Plack, Mojolicious,LWP is easy once I have the data filled into some structure ;))
[choroba]: Algorithm::Loops
[Corion]: choroba: I'm using that to generate the permutations, but I don't know how the user can pass the intended values to my function in a sane way
[Corion]: I have a prototype that permutes the get_parameters, but the values used for the get parameters should be different from the values used for the headers and potentially for parts of the URL
[Corion]: But yes, in general, my approach will be "split the URL into another set of parameters, generate an array of allowed values for each parameter and then NestedLoops() over the set"
[choroba]: hmm... so you need something like bag from Test::Deep, but not for checking, but for generation
[Corion]: This has the dual use of easily requesting sequential URLs and also being suitable for testing
[Corion]: For testing, I want to skip all tests with the same value(s) once one test fails to cut down on the number of failing tests
[Corion]: choroba: Yes, in a way I

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