ID: 25853
User updated by: morgan at mindviz dot com
Reported By: morgan at mindviz dot com
-Status: Bogus
+Status: Open
Bug Type: CGI related
Operating System: RedHat Linux 8.0
PHP Version: 4.3.3
New Comment:
It is not practical to use str_repeat in the example
since it would probably never be used in that case or
many cases as a matter of fact.
Why won't this work ( all that was done switching the
str_repeat line with 'testing' ):
#!/root/php-4.3.3/php -n
<?php
$my_pid = getmypid();
for($z = 0; $z < 10; $z++) {
$test_array = array();
for($i = 0; $i < 5; $i++) {
$test_array[] = 'testing';
;
}
echo "$z: MEMORY USAGE BEFORE UNSET ( % KB PID
) : ".`ps -eo
%mem,rss,pid | grep $my_pid`;
unset($test_array);
echo "$z: MEMORY USAGE AFTER UNSET ( % KB PID
) : ".`ps -eo
%mem,rss,pid | grep $my_pid`."\n";
}
exit;
?>
- I have also tried setting a variable to 'testing'
outside of all loops and assigning $test_array[] =
$the_str_variable; like that and it doesn't free the
memory either.
Previous Comments:
------------------------------------------------------------------------
[2003-10-13 20:33:38] morgan at mindviz dot com
Ya that worked, why does it not free it when I use
assignments like this:
$test_array[$i][$j] = "testing $i $j";
It would be most informative since I need to find a way
to fix my code now.
------------------------------------------------------------------------
[2003-10-13 20:16:22] [EMAIL PROTECTED]
I was a bit fast with this, thanks to Ilia who pointed out the flaws in
your example. Try the following and you'll
see that unset() does free the memory just fine:
#!/root/php-4.3.3/php -n
<?php
$my_pid = getmypid();
for($z = 0; $z < 10; $z++) {
$test_array = array();
for($i = 0; $i < 5; $i++) {
$test_array[] = str_repeat("testing", 100000);
}
echo "$z: MEMORY USAGE BEFORE UNSET ( % KB PID ) : ".`ps -eo
%mem,rss,pid | grep $my_pid`;
unset($test_array);
echo "$z: MEMORY USAGE AFTER UNSET ( % KB PID ) : ".`ps -eo
%mem,rss,pid | grep $my_pid`."\n";
}
exit;
?>
------------------------------------------------------------------------
[2003-10-13 13:17:25] morgan at mindviz dot com
Description:
------------
Basically I'm writing a php-CLI server application that
will never exit unlike an apache process. I have been
attempting to find out why slowly but surely the memory
usage of my CLI app steadily goes up until it has
exhausted all my available memory.
The server app will read in large data sets at times
and then attempts to free those with the unset
function. With further inspection it seems that even
though unset is called the script still has a hold on
or uses the allocated memory and never returns it to
the system.
The code below is a small script that I put together to
show the issue I am seeing, it is quite easy to
reproduce the problem.
As with my server application if the script below was
run forever and the max value of $z in the loop was set
extremely high it would run until all the system's
memory was used up, since unset is not actually
returning any of the used memory for the test_array
back to the system.
Reproduce code:
---------------
#!/root/php-4.3.3/php -n
<?php
$my_pid = getmypid();
echo "GOT PID: ".`ps -eo %mem,rss,pid | grep $my_pid`."\n";
for($z = 0; $z < 10; $z++) {
$test_array = array();
// Build a Test 5x(1000*$z) array, will show incremental mem
usage and after unset
// line will test_array's memory will not be free'd
for($i = 0; $i < 5; $i++) {
for($j = 0; $j < 1000*$z; $j++) {
$test_array[$i][$j] = "testing $i $j\n";
}
}
echo "$z: MEMORY USAGE BEFORE UNSET ( % KB PID ) : ".`ps -eo
%mem,rss,pid | grep $my_pid`;
unset($test_var);
echo "$z: MEMORY USAGE AFTER UNSET ( % KB PID ) : ".`ps -eo
%mem,rss,pid | grep $my_pid`."\n";
}
exit;
?>
Expected result:
----------------
GOT PID: 0.1 1524 3178
0: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.1 1532
3178
0: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.1 1524
3178
1: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.2 2132
3178
1: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.1 1524
3178
2: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.3 2740
3178
2: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.1 1524
3178
3: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.3 3368
3178
3: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.1 1524
3178
4: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.4 3952
3178
4: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.1 1524
3178
5: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.5 4620
3178
5: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.1 1524
3178
6: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.5 5204
3178
6: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.1 1524
3178
7: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.6 5792
3178
7: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.1 1524
3178
8: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.7 6376
3178
8: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.1 1524
3178
9: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.7 7124
3178
9: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.1 1524
3178
Actual result:
--------------
GOT PID: 0.1 1524 3178
0: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.1 1532
3178
0: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.1 1532
3178
1: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.2 2132
3178
1: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.2 2132
3178
2: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.3 2740
3178
2: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.3 2740
3178
3: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.3 3368
3178
3: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.3 3368
3178
4: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.4 3952
3178
4: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.4 3952
3178
5: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.5 4620
3178
5: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.5 4620
3178
6: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.5 5204
3178
6: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.5 5204
3178
7: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.6 5792
3178
7: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.6 5792
3178
8: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.7 6376
3178
8: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.7 6376
3178
9: MEMORY USAGE BEFORE UNSET ( % KB PID ) : 0.7 7124
3178
9: MEMORY USAGE AFTER UNSET ( % KB PID ) : 0.7 7124
3178
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--
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