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Re: Re: Re: Re: Efficient processing of large directory

by BUU (Prior)
on Oct 02, 2003 at 17:51 UTC ( #295990=note: print w/replies, xml ) Need Help??


in reply to Re: Re: Re: Efficient processing of large directory
in thread Efficient processing of large directory

Er, why on earth do you tell him to use while and then to use while to do the exact same thing the for loop had been doing previously? Your method is still going to need to build the 17,000 element list and iterate over it, it just uses a more explicit form. A rewrite which gets around this would be simply:
while(my $x = <*.*>) { do_stuff($x); }
This will only read a single file at a time and has no need to create huge lists.

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•Re: Re: Re: Re: Re: Efficient processing of large directory
by merlyn (Sage) on Oct 02, 2003 at 18:54 UTC
Re5: Efficient processing of large directory
by dragonchild (Archbishop) on Oct 02, 2003 at 17:53 UTC
    Because I'm not answering the original question. I'm answering the question "What's the difference between for and while?". In that context (which was obvious from the followup question), does my post make sense?

    ------
    We are the carpenters and bricklayers of the Information Age.

    The idea is a little like C++ templates, except not quite so brain-meltingly complicated. -- TheDamian, Exegesis 6

    Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.

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[Corion]: ambrus: Yeah, I read that, but it's somewhat vague as in what I really have to implement, and where/how my "other" mainloop should/needs to call AnyEvent
[Corion]: (or maybe I just work better from existing code that I munge until it works and I understand it rather than a short abstract text like "implement everything that's needed" ;) )
[ambrus]: Corion: I think in this case you can get away with only a stub for idle, one that always dies when you create it, because AnyEvent::HTTP doesn't use it, not even indirectly through AnyEvent::Handle or AnyEvent::Socket or AnyEvent::DNS.
[Corion]: The "and I understand it" part is optional.
[Corion]: ambrus: Yes but I also need to implement the file / IO watcher, because Prima has that (in Prima::File), and I need to supply the appropriate thing to make push_write etc. work with Prima
[ambrus]: Corion: yes, you need to implement the io watcher, which should be simple because Prima::File is basically that, and the timer watcher form Prima::Timer
[Corion]: ... or so I think. As I said, I'm somewhat vague on how to make AnyEvent cooperate with a callback-driven IO event loop that gives me callbacks when data is available or can be written

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