cups-polld uses 99% cpu time

[angelb]

> angelb wrote:
> >>Michael De Vlaminck wrote:
> >>
> >>>angelb wrote:
> >>>
> >>>>>Hello,
> >>>>>
> >>>>>I've configured a cups printsystem with 2 servers and about 200 clients
> >>>>>connecting via cups 1.1 and samba.
> >>>>>The clients are configured to poll the 2 servers for printers. But one
> >>>>>server cups-server is the main server. The other one cups-backup is the
> >>>>>backup server. But cups isn't running on cups-backup due to issues with
> >>>>>the accounting system we use.
> >>>>>So the clients poll there printers from cups-server and get a 'unknown
> >>>>>host' error.
> >>>>>We went "live" this morning and by now we had about 10 complaints that
> >>>>>the cups-polld process uses 99% cpu time. After taking a closer look it
> >>>>>seems like it was the poll process which polls cups-server (the one
> >>>>>that
> >>>>>is running) is the one uses that much cpu time.
> >>>>>
> >>>>>What can be the cause of this?
> >>>>>
> >>>>>thanks in advance
> >>>>>
> >>>>>Michael De Vlaminck
> >>>>
> >>>>
> >>>>Quick fix: upgrade or install CUPS 1.2.1
> >>>>
> >>>>I've also ran into the same issue and CUPS 1.2 appears to have the
> >>>>fix.
> >>>>
> >>>>Good luck.
> >>>>
> >>>>Angel
> >>>>
> >>>>
> >>>
> >>>is there also a way do fix it without upgrading?
> >>>
> >>>thx
> >>>Michael
> >>>_______________________________________________
> >>>cups mailing list
> >>>cups at easysw.com
> >>>http://lists.easysw.com/mailman/listinfo/cups
> >>
> >>Or perhaps instead of polling the server you should relay the
> >>printer packets to the subnets of the clients and have
> >>them listen for the packets. Just a thought.
> >>
> >
> >
> > It doesn't matter whether you're using polling, browsing, or relaying,
> > the clients will still have to process the incoming packets. It is in
> > that process that causes CPU to spike specially in a large environment.
> >
> > I've never really had problems with 200+ printers on a client but when
> > we have more than 500, you'll see a significant CPU use. If you have
> > more than 1000+ printers, then you'll in for it big-time; you may have
> > to poll only once-a-day preferrably when the system is most idle.
> >
> > I'm putting a lot of faith into CUPS 1.2 but at the moment, my testing
> > hasn't gone well. Clients(AIX and Solaris) polling crashes while
> > polling the server. I've submitted an STR but I hope it's just an error
> > in my configuration...well soon see.
> >
> > Like most users, I was hoping there was a fix to this in 1.1 but it's
> > addressed only in 1.2....correct me if I'm wrong.
> >
> > Angel
>
> the problem is that the cups-polld process on the clients uses all cpu
> time. the cupsd process on the server needs about 10-40% cpu time but I
> suppose that that's normal.
>
> If we change our configuration so that polling isn't used, instead we
> use client.conf. Will that solve our problem?
>
> Michael

I believe it will not. Your only option I see at this point is upgrade
to 1.2 or purchase ESP's version which contains the fix as was
previously mentioned.

Good luck.

Angel