November 19, 2008 01:57am pst

04.14.2004 at 01:15AM PDT, ID: 20953394

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6.6

'my' array variables avoid memory leaks?

Asked by yashgt in Perl Programming Language

Tags: memory, perl, avoid, explain, leaks

Here is an unexpected behavior in Perl:
#!/usr/bin/perl
$line=readline STDIN;
while ($line ne "") {
chomp $line; # remove newline from $line
@mlsFields = split(/,/,$line);
$line=readline STDIN;
}
When I run this program on HP-Ux using
cat myfile.txt | a.pl

and monitor the memory usage using top,
I see the memory continuously increasing from
CPU TTY PID USERNAME PRI NI SIZE RES STATE TIME %WCPU %CPU COMMAND
0 pts/0 21224 dilbert 237 20 6552K 720K run 0:04 78.36 17.33 perl
to
CPU TTY PID USERNAME PRI NI SIZE RES STATE TIME %WCPU %CPU COMMAND
1 pts/0 21224 dilbert 227 20 21400K 15492K run 0:49 98.95 90.82 perl
and further.
This implies that the array @mlsfields is repeatedly being allocated without being cleared. I would ideally expect Perl to overwrite the existing array during each iteration of the loop.

Changing the line to :
my @mlsFields = split(/,/,$line);

solved the problem. The memory usage remains stable after making this change.

Can someone explain this?

Also, by making the array my, do you think the array would be overwritten? or would it be deallocated and reallocated for the new iteration?

Thanks
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'my' array variables avoid memory leaks?

Asked by yashgt in Perl Programming Language

Tags: memory, perl, avoid, explain, leaks

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