How can you limit memory in Django WSGI applications?

Question

I want my application to MemoryError when its use exceeds 1 GB. I work in the WSGI daemon mode.

I see 3 places where there may be a memory limit:

• apache.conf
• wsgi somewhere
• Django configuration

but I can not find the correct configuration options. In PHP, you can do this with:

php_value memory_limit 1GB

in apache.conf

Answer 1

Resource memory limits are not implemented on most platforms, although API C definitions exist. Therefore, mod_wsgi does not attempt to implement such restrictions. If PHP does this, it can do this because it is a more limited and controlled environment than Python.

The only portable way is to start a separate daemon process that runs “ps” or uses “/ proc” to monitor the memory usage of processes, and then sends a SIGINT signal to those that pass some predefined value.

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UPDATE

Version 3.4 of mod_wsgi supports daemon mode options that can limit memory usage. Cm:

• http://code.google.com/p/modwsgi/wiki/ChangesInVersion0304

Do they work depending on the operating system used.

Answer 2

Use resource.setrlimit() with resource.RLIMIT_VMEM .