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Re^2: Perl always reads in 4K chunks and writes in 1K chunks... Loads of IO!

by ChOas (Curate)
on Jan 01, 2006 at 16:48 UTC ( #520261=note: print w/replies, xml ) Need Help??


in reply to Re: Perl always reads in 4K chunks and writes in 1K chunks... Loads of IO!
in thread Perl always reads in 4K chunks and writes in 1K chunks... Loads of IO!

This:

open DF, "test.txt" || die "Can't read 'test.txt': $!\n"

Does not do what you think it does.

The || ties itself to "test.txt", which is always true, and not to the return of the open.

This:
open(DF, "test.txt") || die "Can't read 'test.txt': $!\n"

or:

open DF, "test.txt" or die "Can't read 'test.txt': $!\n"

(or binds less tight than ||)

Would accomplish what you want.


GreetZ!,
    ChOas

print "profeth still\n" if /bird|devil/;

Replies are listed 'Best First'.
Re^3: Perl always reads in 4K chunks and writes in 1K chunks... Loads of IO!
by zebedee (Pilgrim) on Jan 04, 2006 at 02:01 UTC
    Why are you measuring under Windows to see what will happen on Unix?
    If you've only got one machine to play with, why not boot off a LiveCD (like Knoppix) and measure your code (or a key subset) under Linux?
    Might not be the same OS your ISP is using, but closer to Unix than Windows?
    Might make absolutely no difference, but at least you might be a bit closer to comparing apples to apples rather than apples (Unix) to oranges (Windows) ...

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[1nickt]: chacham I have wanted to, and dones so, and so stated in a reply, and been roundly downvoted 2-1. (I assume for attempting to censor.)
[1nickt]: pryrt yes, I see. There is no way to differentiate without forcing to a string and all sort of weird stuff. It is enough. User 42 can get creative if s/he wishes.
[chacham]: i sent him a private message expressing my displeasure.
[1nickt]: chacham It was worse than 2-1 ! almost 4-1 !

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