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Manjeet Chaudhary
manjeet at infogridpacific.com
Thu Jul 7 04:55:42 EDT 2005
Hi Guys We are facing memory leak problem; most probably due to mod_python. Our application is web-based application using below mentioned Apache server version including mod-python. We are using Publisher Handler in mod-python. We are facing a severe memory leak problem [ memory is used and never being freed , it is freed only when we stop apache server (httpd) or restart it]. We are using dbxml(2.1.8) as our backend database. Our program (python module) in cgi-bin dir is processing the url request. The module is accessing the document from the dbxml container through Simple - XML -RPC communication and returning to the browser. As the no. of requests increases memory is used up [never freed again] and the server crashes [CentOS automatically kill the process], but if we stop or restart httpd the memory is released in huge amount . There were similar problems in dbxml version 2.0.9 , but those were solved when we upgraded it to version 2.1.8. I have already updated my kernel, mod_python, dbxml. I used Valgrind to check memory leak. But in summary report it is not showing any type of memory leak. I also read that is there is some problem with Python and it's memory management. ( http://evanjones.ca/python-memory.html ). Is this a problem due to Python's memory management. But our other application/servers are working fine. It seems that apache/mod_python process is leaking memory. This is a serious problem and so we need a solution for it. Please help me out for solving this problem. Maybe somebody here has any idea what is going on. Thank you in advance and all the best, Manjeet Chaudhary Summary: ----------------------------------------------------------- ................. Hardware/Softwares and OS we are using :- Pentium4 machine with 1GB DDR-RAM. CentOS 4.0 - kernel 2.6.9-11-EL. Upgraded from 2.6.9-3 Dbxml - 2.1.8 upgraded from 2.0.9 Mod_Python - 3.1.4 with Patches Python - 2.3.4. HTTPD server - Apache/2.0.52 Pybsdbd - bsddb3-4.3.3 ................. Httpd Configurations: (mod_python specific. We are using .htaccess in cgi-bin directory ) <Directory "/var/www/cgi-bin"> AllowOverride FileInfo Options FollowSymLinks Order allow,deny Allow from all </Directory> ................. .htaccess file: AddHandler mod_python .py SetHandler mod_python PythonHandler mod_python.publisher PythonDebug On ................. Remedies i applied: 1. Updated Kernel from 2.6.9-3 to 2.6.9-11.EL as suggested in http://lists.centos.org/pipermail/centos/2005-June/007113.html 2. Updated DbXml from 2.0.9 to 2.1.8 as suggested in http://www.sleepycat.com/xml_update/2.1.8/if.2.1.8.html 3. Reinstalled mod_python with patches as mentioned in http://www.dscpl.com.au/projects/vampire/patches.html
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