On Mon, Mar 21, 2011 at 01:46, Mike McClain <m.d.mccl...@cox.net> wrote:
snip
>> > my @report = map
>> > "$_->{cell}\t$_->{sect}\t$_->{carr}\t$_->{chan}\t$_->{dist}\n" , @sorted;
>> > print @report ;
>>
>> This map will consume a lot of memory, better do it using a foreach loop.
>
> In what way will the use of map here use any more memory than a foreach loop?
snipThe problem is that map returns a list. That list will exist in memory as you copy it to @report. Just before the assignment is finished, you will be using twice the amount of memory you expect. Perl doesn't tend to return memory to the system, so, even though no variable is using it, the memory used to hold the list will still be held by perl. Happily, perl will reuse the memory, so, as long as it isn't huge, it normally isn't a big deal. -- Chas. Owens wonkden.net The most important skill a programmer can have is the ability to read. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
