Printing delay

[angelb]

> angelb wrote:
>
> > However, I seem to have narrowed down the root cause of the delay. It
> > turned out to be an open file descriptor shortage, as I have initially
> > thought it was.
> >
> > Here's some before and after ulimit changes(clients only):
> >
> >> # timex lpstat -p|wc
> > real 21.32    <-- point of interest - long response time
> > user 3.54
> > sys  0.01
>
> [...]
>
> > Now, with the CUPS file descriptor increased, we have better performance:
> >
> >> # timex lpstat -p|wc
> > real 7.94  <--- much better
> > user 3.67
> > sys  0.08
> >
> >     2683   32196  177126
>
> So, by what amount did you increase the number of file descriptors, and
> how did you do that? New Kernel build? New CUPS build?
>

Oopss...sorry, the "CUPS file descriptor increased" needs
clarification.

The global default setting for our open file descriptors(nofiles) is
set to 2000. I've set ulimit to our clients to 8K.

I had two options: 1) set ulimit to root to 8k or 2) insert the ulimit command in the cups startup script

I've decided to use option 2. I've inserted "ulimit -n 8192" into the
startup script which effectively sets root's soft/hard limits when
cupsd is restarted. Since root starts cupsd, cupsd effectively
inherits the ulimit parms. I just have to remember this change when
upgrading CUPS.

I did not have to build/rebuild anything. It was simply changing the
ulimits that solved the problem.

There were no other changes to client/server configuration.

Thanks,
Angel