'Too many open files' error

[matkuki]

Hi,

I have a long running application that works great, but recently I upgraded it a bit, and it now serves a bit more images through Tornado web server than before, and after users have connected/disconnected to it lot's of times, at random times the application crashes and throws:

...
Too many open files (src/epoll.cpp:65)
Aborted (core dumped)

The first thing I tried is to set the maximum open file limit on the Ubuntu Linux the application is running on to 10 times more, but with no success, still get the error.

Any suggestion of what I else I could try to fix this? Thanks