Re: [Queue-developers] new intermediate development Queue version

[W. G. K. <wer...@ya...>]

Perhaps we should change this behavior. (It's actually very old and somewhat
historical by now.)

It's still a good idea not to start flooding the system with jobs after a crash,
but if the queue is empty jobs should be processed immediately. Jobs sitting in the
queue could be started slowly, one after another, until a certain grace period
expires.

QingLong wrote:

> On Tue, Mar 06, 2001 at 02:25:40PM +0100, Gert Van den Eynde wrote:
> >
> > I have even a more strange problem... (Yes, that's possible :-) )
> >
> > If I start queued simply with --foreground (so no --debug),
> > the now queue doesn't accept any jobs.
> > I get this as output from queue -i -v -w -p -h fermi -- hostname
> >
> > Requesting load average for queue "now" on host "fermi"...
> > The host "fermi" is not able to serve queue "now".
> > Failed to submit job in queue "now" to host "fermi".
> >
>    This is not strange, look in queued main() (queued.c around line 900):
> |
> |  /*
> |   * Go to sleep for a while before flooding the system with
> |   * jobs, in case it crashes again right away, or the
> |   * system manager wants to prevent jobs from running.
> |   * Send a SIGALRM to give it a kick-start.
> |   */
> |
> |  if (!debug) {
> |    alarm(sleeptime);
> |
> |    /* WGK: Rather than do a sigpause(), here, we do a check_query
> |       here, which will cause us to wake up immediately if someone
> |       submits a new job in the first few minutes. This could cause
> |       the batchd to flood the system with new jobs in the event of an
> |       immediate query, but is unlikely to cause any real problems.*/
> |
> |    check_query();
> |
> |    (void) alarm(0);
> |  }
> |
>  One have to wait for sleeptime seconds after starting queued in non-debug mode
>  until it will begin accepting jobs. Haven't I already pointed this out here?
>
> >
> > If I start queued with --foreground --debug,
> > I get from queue -i -v -w -p -h fermi -- hostname
> >
> > Requesting load average for queue "now" on host "fermi"...
> > Host "fermi" appears to be able to serve queue "now".
> > Ok, connecting to QueueD at it.
> > Trying "fermi"...
> > Going to submit job to queue "now" on host "fermi".
> > queue.c: main(): tty(in/out/err): 1 1 1.
> > fermi
> >
>    Isn't thisexpected output?
>  What is the problem here?
>
>       QingLong.
>
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