From: jerome at kingofsofa dot org
Operating system: linux
PHP version: 5.0.4
PHP Bug Type: Performance problem
Bug description: memory leak
Description:
------------
I think I have found a memory leak in php 4 and 5
depending on the size of the string concatenated to a variable a few bytes
of memory are lost. See attached code.
I have noticed that if you replace echo "instance $i "... by a "smaller"
sentence echo "i $i " then the leak is not there.
Since it has been there for a while I was wondering if this is actually an
expected behavior. If so how should I do to avoid this.
This is part of a script running constantly and calling some trace
function that end up doing an echo.
Reproduce code:
---------------
for( $i = 0; $i < 100 ; $i++ ) {
echo "instance $i ".memory_get_usage()."\n";
}
echo "-------------------------------------------\n";
for( $i = 0; $i < 100 ; $i++ ) {
echo "instance ";
echo $i;
echo " ".memory_get_usage()."\n";
}
Expected result:
----------------
Content-type: text/html
X-Powered-By: PHP/5.0.4
instance 0 40248
instance 1 40264
instance 2 40264
instance 3 40264
instance 4 40264
instance 5 40264
instance 6 40264
instance 7 40264
instance 8 40264
...
instance 99 40264
-------------------------------------------
instance 0 40264
instance 1 40280
instance 2 40280
instance 3 40280
instance 4 40280
instance 5 40280
instance 6 40280
Actual result:
--------------
Content-type: text/html
X-Powered-By: PHP/5.0.4
instance 0 40248
instance 1 40288
instance 2 40304
instance 3 40320
instance 4 40336
instance 5 40352
instance 6 40368
instance 7 40384
instance 8 40400
...
instance 99 41856
-------------------------------------------
instance 0 41856
instance 1 41872
instance 2 41872
instance 3 41872
instance 4 41872
instance 5 41872
instance 6 41872
--
Edit bug report at http://bugs.php.net/?id=32689&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=32689&r=trysnapshot4
Try a CVS snapshot (php5.0):
http://bugs.php.net/fix.php?id=32689&r=trysnapshot50
Try a CVS snapshot (php5.1):
http://bugs.php.net/fix.php?id=32689&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=32689&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=32689&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=32689&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=32689&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=32689&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=32689&r=support
Expected behavior: http://bugs.php.net/fix.php?id=32689&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=32689&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=32689&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=32689&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=32689&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=32689&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=32689&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=32689&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=32689&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=32689&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=32689&r=mysqlcfg
