On Wed, 2008-12-10 at 13:15 +1030, org chen wrote:
> I read a large file into a hash table. This hash table is used only
> once in the subroutine. I am very concern the memory usage, So I plan
> to realse the memory after used the hash table. The way I used is:
>
> my %hash = ();
>
> #read the large file into the hash table
> ...
>
> #release memory
> %hash = ();
>
> Do you think this way will really release memory usage?
>
Yes.
If you declare the has inside the sub, it will be released when the sub
is exited. That is, unless you create a reference to it and store the
reference in an outside variable.
Example:
#!/usr/bin/perl
use strict;
use warnings;
sub foo {
my %hash1 = ( a => 1, b => 2 ); # This will be release on exit
my %hash2 = ( x => 3.14, y => 1.76 );
return \%hash2; # %hash2 will NOT be released until later
}
--
Just my 0.00000002 million dollars worth,
Shawn
The key to success is being too stupid to realize you can fail.
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