Bug #62467 [NEW]: SimpleXML memory usage is not reported by memory_get_usage()

From: zerkyn at gmail dot com Operating system: Windows, Linux PHP version: 5.3.14 Package: SimpleXML related Bug Type: Bug Bug description:SimpleXML memory usage is not reported by memory_get_usage() Description: ------------ When using SimpleXML functions to load XML data, the memory consumption is not tracked internally by PHP. Calling the "memory_get_usage()", you can see only a light memory consumption increase, which is clearly not an appropriate value for the document loaded (it is easily seen on a big documents, e.g. 1Mb+). However, the proper memory increase is observed by using system tools ('tasklist /FI "PID eq ..."' under Windows, 'ps' under Linux). The issue affects profiling scripts, which are not able to fulfill their role. And it affects 'memory_limit' setting, which doesn't control application memory, consumed by SimpleXML. Test script: --------------- <?php echo "Memory usage before: ", memory_get_usage(), "\n"; echo "Sys memory usage before: ", SystemMemoryUsage(), "\n"; $xml = simplexml_load_file('pretty_big_file_of_1mb_size.xml'); echo "Memory usage after: ", memory_get_usage(), "\n"; echo "Sys memory usage after: ", SystemMemoryUsage(), "\n"; /** -------------------------------------- */ function SystemMemoryUsage() { ... // Return memory consumption by executing system tool - tasklist, ps or anything else } Expected result: ---------------- "Memory usage after" and "Sys memory usage after" show, that memory consumption was increased by approximately same values. Actual result: -------------- "Memory usage after" shows light memory consumption increase, while "Sys memory usage after" shows much bigger value. -- Edit bug report at https://bugs.php.net/bug.php?id=62467&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=62467&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=62467&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=62467&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=62467&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=62467&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=62467&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=62467&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=62467&r=needscript Try newer version: https://bugs.php.net/fix.php?id=62467&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=62467&r=support Expected behavior: https://bugs.php.net/fix.php?id=62467&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=62467&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=62467&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=62467&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=62467&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=62467&r=dst IIS Stability: https://bugs.php.net/fix.php?id=62467&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=62467&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=62467&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=62467&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=62467&r=mysqlcfg