Re: Timeslices -- MIDRANGE-L

Thanks Alexei. This was illuminating.

----- Original Message -----
From: Alexei Pytel <pytel@us.ibm.com>
To: <midrange-l@midrange.com>
Sent: Thursday, August 30, 2001 11:07 AM
Subject: Re: Timeslices


>
> This one is simple.
> Save command does its front-end processing in a job, but real work is done
> by LDxxxx task in a background.
> Job stays in EVTW waiting a report from LDxxxx task.
> This task has prioirity one less (numerically one more than your job).
> Now if you have other jobs in a loop with a priority higher than LDxxxx
> task, it will never have a chance to run.
> If you turn dynamic priority scheduler on, this will not happen, because
> looping jobs will get their priority lowered, and LDxxxx task will have its
> priority bumped with a result that it will eventually run and do its job.
> This is an excellent illustration why dynamic scheduler was introduced!
>
>     Alexei Pytel
>
> "The better is the worst enemy of the good"
>
>
>
>
>
>                     "Leif Svalgaard"
>                     <leif@leif.org>           To:
<midrange-l@midrange.com>
>                     Sent by:                  cc:
>                     midrange-l-admin@mi       Subject:     Re: Timeslices
>                     drange.com
>
>
>                     08/30/2001 10:51 AM
>                     Please respond to
>                     midrange-l
>
>
>
>
>
> From: Alexei Pytel <pytel@us.ibm.com>
> > It might happen because of dynamic priority scheduler.
>
> The DYNSCD is now turned off. I have three jobs looping (ALOOP).
> Every second they show a screen (with no wait) and YIELD their timeslice.
> Job 0007 is trying to save an object to a save file that already exists,
> and I had to type "G" to tell it to Go ahead. After that, the save is stuck
> in an EVTW. Job 0001 is sitting on a DSPW. I can interact with that
> screen with no wait at all. (This is on V4R5).
>
>      QBASE          QSYS        SBS      .0                   DEQW
>        DSP02        LSVALGAARD  INT     1.1  CMD-WRKACTJOB    RUN
>        QPADEV0001   LSVALGAARD  INT      .0  CMD-LSEXPLR      DSPW
>        QPADEV0002   LSVALGAARD  INT     7.2  PGM-ALOOP        RUN
>        QPADEV0003   LSVALGAARD  INT     8.6  PGM-ALOOP        RUN
>        QPADEV0005   LSVALGAARD  INT     7.3  PGM-ALOOP        RUN
>        QPADEV0007   LSVALGAARD  INT      .0  CMD-SAVOBJ       EVTW
>        QSYSSCD      QPGMR       BCH      .0  PGM-QEZSCNEP     EVTW
>
> If I "hold" jobs 0002, 0003, and 0005, the save finishes. But why was the
> job stuck on the EVTW?
>
>
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