ID: 28131
Updated by: [EMAIL PROTECTED]
-Summary: Scripts can't consume more than 64MB on Windows
XP/2000
Reported By: webmaster at macway dot com
Status: Bogus
Bug Type: Reproducible crash
Operating System: Windows XP
PHP Version: 4.3.6
New Comment:
ah, this bug.
It is to do with the COW reference created by the engine
when you copy $chunk around. Since it is the same chunk, the engine
saves copying the 1MB and adds a reference to the variable. The
problem is that ZE1 has a limit of 64k references before it overflows
and causes this problem.
It has nothing to do with memory usage.
It is a known bug in this database (although I couldn't find it just
now; it *is* in here somewhere).
This problem will not be fixed in PHP 4.x, but has already been
addressed in PHP 5.
Workaround: use $toto .= str_repeat('a', 1024) inside the main loop, as
this returns unique strings on each iteration.
Previous Comments:
------------------------------------------------------------------------
[2004-04-26 18:02:22] webmaster at macway dot com
> wez
Ok perharps its works with str_repeat, but it doesn't
seem to work with array.
Please check with my code. Maybe I badly worded it,;
maybe it's just with arrays, check with my lateest code
please
------------------------------------------------------------------------
[2004-04-26 17:53:33] webmaster at macway dot com
As I just said, I retested it with PHP 4.3.6 ALONE
(without any webserver) using the php.exe under windows
XP.
So it's clearly a problem with PHP 4.3.6 itself
------------------------------------------------------------------------
[2004-04-26 17:32:16] [EMAIL PROTECTED]
Sorry, but your problem does not imply a bug in PHP itself. For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions.
Thank you for your interest in PHP.
My 512MB laptop running XP will allocate 800MB (probably as much as the
page file size, if I pushed it).
C:\php4>php -r "$x = str_repeat('*', 128 * 1024 * 1024); echo 'Done';"
Done
C:\php4>php -r "$x = str_repeat('*', 400 * 1024 * 1024); echo 'Done';"
Done
C:\php4>php -r "$x = str_repeat('*', 600 * 1024 * 1024); echo 'Done';"
Done
C:\php4>php -r "$x = str_repeat('*', 800 * 1024 * 1024); echo 'Done';"
Done
C:\php4>php -r "$x = str_repeat('*', 1280 * 1024 * 1024); echo
'Done';"
FATAL: emalloc(): Unable to allocate 1342177281 bytes
It works fine; no crashes. You must have something wrong with your
configuration; check your memory_limit and error_reporting settings and
talk to someone on a support channel to discover the reason that you
have problems with this.
------------------------------------------------------------------------
[2004-04-26 16:58:08] webmaster at macway dot com
Faster code exhibiting the problem :
<?php
for ($i = 1; $i <= 1024; $i++) // I'm just making a 1024
Byte string
{
$chunk .='a';
}
for ($i = 1; $i <= 66000; $i++) // if you use 65000 it
works
{
$tablo[]=$chunk;
}
echo "c'est fini";
?>
------------------------------------------------------------------------
[2004-04-26 16:55:59] webmaster at macway dot com
THE PROBLEM IS VERY SERIOUS : it crashes the php engine
on Windows XP. It is reproductible.
I've redonne some tests and it appears that the web
server is nit the issue (launching the php.exe without
any webserver exhibits the problem).
I've you have 4 different variables, then the max size
of each will be 64/4 = 16MB of ram max. That means the
total ram consumed by the script has to be lower than
64MB
------------------------------------------------------------------------
The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
http://bugs.php.net/28131
--
Edit this bug report at http://bugs.php.net/?id=28131&edit=1
