[Beowulf] Concurrently open sockets limit on Linux system
landman at scalableinformatics.com
Sun Jun 17 11:52:03 PDT 2007
Galton, Simon wrote:
> (according lsof on the system running the license manager) seems to hold
> a socket open during the duration of the job.
> We want to run a couple of hundred of these jobs on our cluster, but
> after job 126 the client can no longer connect to the license manager.
This seems to suggest somewhere that there is a 128 socket limit on the
service. How is the license manager run? What does
tell you for the user that the license manager runs as? Any notes in
> The server hosting the license manager is otherwise fine, and you can
> continue to perform network-based operations on and against it...
> The vendor feels that they have not coded a specific limit; I'm
> wondering if it's file descriptors or somesuch. I raised the limit of
> FDs on the system to 65000+ and verified that the change took effect; no
> change to the applications behaviour. It's a c-based app, compiled with
> gcc on a Fedora Core 6 system, I believe.
Doesn't sound like an FD limit, but as a socket limit. Older inetd's
had something like 20-40 connections per process. If you are serving
this through xinetd or similar, you might be able to raise these limits.
> Any thoughts?
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