The default file descriptor limit (ulimit -n 1024) is too low

Stephan Hermann sh at
Mon Sep 20 17:06:09 BST 2010

On Mon, Sep 20, 2010 at 03:21:29AM -0700, Scott Ritchie wrote:
> Would there be any harm in raising this?
> I ask because I've seen a real world application hit this limit.  The
> application in question is multithreaded and opens separate threads and
> files to work on for each core; on a 4 core machine it stays under the
> limit, while on an 8 core machine it hits it and runs into strange errors.
> I feel that, as we get more and more cores on machines applications like
> this are going to increasingly be a problem with a ulimit of only 1024.

I saw this as well recently here...but it was more a developers bug not closing
sockets or files, while trying to code in java.

In case this needs to be raised, this should be done on a per server decision by the sysadmin.
I don't see why it should be raised in general...

But I'm open for rationals.


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