Ubuntu's next release and raising hard ulimit on ubuntu

Paul Chitescu paulc at voip.null.ro
Fri Mar 25 09:38:09 CDT 2011

On Friday 25 March 2011 03:26:25 pm Dan Kegel wrote:
> Scott, correct me if I'm wrong, but does Natty still have the
> hard limit of 1024 files open per process?
> If so, should be ask people to go vote for
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/663090
> ?
> Getting that limit raised might avoid increasing numbers of
> support requests from users who can't figure out why Wine can't run their
> p2p downloader ( http://bugs.winehq.org/show_bug.cgi?id=25015 ).

This is not an Ubuntu limitation but rather of the (g)libc API implementation.

At least on glibc it is possible to increase the FD_SETSIZE at build time. 
Been there, done that, got the T-shirt. No need for header patching.


Caveat: FD_... operations take longer if FD_SETSIZE is increased.

On all relevant platforms it is possible to check if a fd is above the limit. 
The application code must do so.

Best is to internally replace select() with poll() on platforms that support 

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