> From [EMAIL PROTECTED] Mon Dec 15 03:36:49 2003
> Date: Mon, 15 Dec 2003 10:46:45 +0000 (GMT)
> From: Toby Blake <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: Re: LPRng: lengthy delay between one job finishing and another one
> starting
>
> > If you are using your own filters, then make sure you close
> > the STDOUT/STDIN, etc., and make sure you exit.
>
> I'm almost 100% certain that the problem is *not* related to our
> filters. As you can see below, the psif filter happily finishes at
> 15:27:59, however there is a further delay of 7 minutes while lpd is
> waiting for the subserver to exit:
>
> IF filter 'psif' filter finished at 2003-12-09-15:27:59.884 ## [EMAIL PROTECTED]
> number=602 process=23168
> printing finished at 2003-12-09-15:27:59.884 ## [EMAIL PROTECTED] number=602
> process=23168
> accounting at end at 2003-12-09-15:27:59.910 ## [EMAIL PROTECTED] number=602
> process=23168
> finished '[EMAIL PROTECTED]', status 'JSUCC' at 2003-12-09-15:27:59.910 ## [EMAIL
> PROTECTED] number=602 process=23168
> waiting for subserver to exit at 2003-12-09-15:34:58.800 ## A=<NULL> number=0
> process=23164
> subserver pid 23168 exit status 'JSUCC' at 2003-12-09-15:34:58.800 ## A=<NULL>
> number=0 process=23164
>
> Note that these subserver lpd processes appear in output from top as
> 'defunct' and won't be killed even by a kill -9 but are killed somehow
> after the delay above.
>
> I also only seem to see this problem when there are a lot of jobs in
> the queue - in this case, in excess of 40 on one printer and 20+ on
> another printer, both served by this server - as the queue sizes go
> down, the delay goes down too. Can the size of the queue be affecting
> this?
>
> Toby
These processes are 'zombies' waiting for the main LPD process to
harvest (wait) for them. The LPD code is waiting in a select
loop for either a process to exit or for a connection.
Setup_waitpid_break();
errno = 0;
fd_available = select( max_socks,
FD_SET_FIX((fd_set *))&readfds,
FD_SET_FIX((fd_set *))0,
FD_SET_FIX((fd_set *))0, timeout );
err = errno;
Setup_waitpid();
plp_signal_t sigchld_handler (int signo)
{
signal( SIGCHLD, SIG_DFL );
write(Lpd_request,"\n", 1);
}
void Setup_waitpid (void)
{
signal( SIGCHLD, SIG_DFL );
}
void Setup_waitpid_break (void)
{
(void) plp_signal_break(SIGCHLD, sigchld_handler);
}
So under load, the LPD server will probably wait in the select for
a while.
Patrick
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