Bug #60937 [Opn->Nab]: Memory leak on unserialize for nested objects

Edit report at https://bugs.php.net/bug.php?id=60937&edit=1 ID: 60937 Updated by: laruence@php.net Reported by: npm at nuestrared dot com Summary: Memory leak on unserialize for nested objects -Status: Open +Status: Not a bug Type: Bug Package: Performance problem Operating System: Debian Linux PHP Version: 5.4SVN-2012-01-31 (snap) Block user comment: N Private report: N New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php defaultly, php gc will run when the buffer root reach 10000, but you can force the collection of cycles by calling gc_collect_cycles() function. see: http://www.php.net/manual/en/features.gc.collecting-cycles.php Previous Comments: ------------------------------------------------------------------------ [2012-01-31 12:55:44] npm at nuestrared dot com Description: ------------ Hi, this is a recurring problem in PHP when unserializing large nested objects. When unserializing inside a loop the same serialized object, the total memory consumption increases every couple of iterations. I am attaching the code to replicate it. Have tested it in the latest 5.4 (snap), it also occurs in 5.3. Let me know if you need any more details, Tested on Debian Linux 64 wheezy/sid, however I believe is platform independent. Couldn't find a bug category for serialize/mem leak related issues. Test script: --------------- <?php $str = base64_decode('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'); for ($i=0; $i<1000; $i++) { echo "Iteration $i\t Mem ".memory_get_usage(true)."\n"; unserialize($str); } Expected result: ---------------- The memory consumption should be stable, it increases with iterations. Actual result: -------------- Result from script: Iteration 0 Mem 262144 Iteration 1 Mem 524288 Iteration 2 Mem 524288 Iteration 3 Mem 524288 Iteration 4 Mem 524288 Iteration 5 Mem 524288 Iteration 6 Mem 524288 Iteration 7 Mem 786432 Iteration 8 Mem 786432 Iteration 9 Mem 786432 Iteration 10 Mem 786432 Iteration 11 Mem 786432 Iteration 12 Mem 786432 Iteration 13 Mem 786432 Iteration 14 Mem 1048576 Iteration 15 Mem 1048576 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=60937&edit=1