printing problem on 2.2.8a and 3.0alpha24

[Joe Meslovich]

I already have that patch installed on my box

SunOS Luna 5.6 Generic_105181-34 sun4u sparc SUNW,Ultra-5_10

Any other suggestions?

On Fri, 23 May 2003 jra at dp.samba.org wrote:

> On Fri, May 23, 2003 at 03:28:57PM -0400, Joe Meslovich wrote:
> > I have looked into the high CPU usage problem that I have been having on
> > Solaris 2.6 running either 2.2.8a or 3.0. I'm not sure if I understand
> > exactly how it works yet, so if I'm wrong please set me on the right track
> > ;). Anyway the high cpu usage seems to be tied to locking the specific
> > printer tdb after spawning the external lpq command. I see the process
> > open the tbd database for a specific queue. Then it spawns the child that
> > runs lpq. The child returns, and then the parent spins on a fcntl(29,
> > F_SETLKW64, 0xEFFFE6B8) command. After spinning on the lock I see time()
> > get called again three seconds after the last time() and it does a munmap
> > of the filedes for that queue and moves on to the next one. It does the
> > same thing for each queue it seems. I have something like 50 queues which
> > means it takes on the order of 150 seconds to stat all the queues. Below
> > is an excert of my truss of an affected process. Part of my problem is I
> > don't fully understand what is supposed to happen to the tdb after the
> > tmp file containing the lpq result is released.
>
> Ah - Solaris, tdb, fcntl. This is a known bug in Solaris. Please ask
> Sun for the 'scalable fcntl locking patch' (sorry, can't remember the
> Solaris patch number).
>
> The CPU usage of Solaris without this patch is dreadful on systems using
> fcntl locks.
>
> Jeremy.
>

----------------------------------------------------------------------------
Joe Meslovich						joe at bridgewater.edu
Associate Network/Systems Engineer	                IT Center
Tel: (540) 828 - 5343