Date: Wed, 30 Jul 2003 15:02:51 +0400 From: Andrew Belashov <bel@orel.ru> To: freebsd-sparc64@freebsd.org Subject: fork&Perl BUG Message-ID: <3F27A5DB.2050601@orel.ru> In-Reply-To: <20030725153258.GE10708@funkthat.com> References: <3F210BF6.6070001@orel.ru> <20030725153258.GE10708@funkthat.com>
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[-- Attachment #1 --]
John-Mark Gurney wrote:
> Andrew Belashov wrote this message on Fri, Jul 25, 2003 at 14:52 +0400:
>
>>My script working perfectly on FreeBSD 4.7R i386.
>
>
> Does it work perfectly on 5.1-R?
Yes, it work right on FreeBSD 5.1-R/i386.
I'm still work above this problem.
My new script crashing Perl@sparc64 depending on memory usege.
Good example:
--------------------------------------------------------------
bel@trash$ perl perlbug.pl 40000
........................................
Main: sum = 19904.3003875081, cnt = 40000
Child sleeping...
Child pid = 89373
Parent working...
Parent: sum = 19904.3003875081, cnt = 40000
Parent waiting a child...
Child working...
Child: sum = 19904.3003875081, cnt = 40000
Child exiting...
Parent exiting...
--------------------------------------------------------------
Bad example:
--------------------------------------------------------------
bel@trash$ perl perlbug.pl 80000
................................................................................
Main: sum = 39912.0714518987, cnt = 80000
Child pid = 89383
Parent working...
perl in realloc(): warning: modified (chunk-) pointer
Out of memory!
Attempt to free unreferenced scalar at perlbug.pl line 13.
perl in free(): warning: modified (chunk-) pointer
Parent: sum = 39912.0714518987, cnt = 80000
Parent waiting a child...
Parent exiting...
--------------------------------------------------------------
Any ideas?
How to localize problem?
[-- Attachment #2 --]
#!/usr/bin/perl -w
use IO::Handle;
my %arr;
my @tmpl = ('.', '/', '0'..'9', 'a'..'z', 'A'..'Z');
my $lentmpl = @tmpl;
sub docheck {
my $prefix = shift;
my $sum = 0; my $cnt = 0;
foreach my $key (keys(%arr)) {
$sum += $arr{$key}; $cnt++;
}
print "$prefix: sum = $sum, cnt = $cnt\n";
}
my $maxsize = shift;
STDOUT->autoflush(1);
STDIN->autoflush(1);
STDERR->autoflush(1);
for (my $i = 0; $i < $maxsize; $i++) {
my $key = '';
foreach my $j (0..7) {
$key .= $tmpl[rand($lentmpl)];
}
$arr{$key} = rand;
print "." if (($i % 1000) == 0);
}
print "\n";
&docheck('Main');
die "fork()" unless defined(my $pid = fork());
if ($pid) {
print "Child pid = $pid\n";
print "Parent working...\n";
&docheck('Parent');
print "Parent waiting a child...\n";
wait();
print "Parent exiting...\n";
exit(0);
} else {
print "Child sleeping...\n";
sleep(30);
print "Child working...\n";
&docheck('Child');
print "Child exiting...\n";
exit(0);
}
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