Unless you know what you are doing, no user program should be in the B
Queue. Queues C, D, and E are circular by nature, processes can be
swapped in and out based upon the resources required in the process.
Queues A and B are linear, they will only exit the queue if they are
finished or the process requests to be swapped out. In other words, if
a process in one of these queues needs a resource that the system needs,
you will get a system deadlock or system failure.
I have written various programs that needed to run in B queue but the
program controlled its use and made sure it would never be in conflict
with the operating system.
Hope this helps,
Olav Kappert
IOMIT International (Application Development Specialist)
Tony Summers wrote:
>Avoid A and B queues for your programs/jobs - those are reserved for
>system processes.
>
>Generally use the C queue for sessions and D queue for jobs, although
>some 3rd party products that run via background jobs need up-lifting to
>CQ. We also run some of our own "important" background jobs in the C
>queue.
>
>I've not often seen the E queue being used except for un-important jobs
>that have no possiblity of impeding (e.g. tranasction locks) other
>processes.
>
>-----Original Message-----
>From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On
>Behalf Of Skiba, Bruno
>Sent: 30 January 2007 23:26
>To: [log in to unmask]
>Subject: [HP3000-L] SHOWQ command and Quantum question
>
>Greetings to all you Listers out there!
>I want to pick at some of those massive brains out there with some MPE
>wizardry.
>
>I was wondering about how others have their systems setup with regard to
>running jobs in different queues.
>If I issue a "showq;active":
>
>I get a table like this:
>
> DORMANT RUNNING
>
>Q PIN JOBNUM Q PIN JOBNUM
>
> B U2603 #J3459
> C M993 #S6417
> C U1833 #J3917
> D U3000 #J3941
>
>
> ------QUANTUM-------
>QUEUE BASE LIMIT MIN MAX ACTUAL BOOST TIMESLICE
>----- ---- ----- --- --- ------ ----- ---------
> CQ 152 200 1 2000 2 DECAY 200
> DQ 202 238 2000 2000 2000 DECAY 200
> EQ 240 253 2000 2000 2000 DECAY 200
>
>I guess I need some more information about how this mechanism works.
>
>It seems to me that the CQ gets all the available QUANTUM allocated to
>it, yet is currently using 2.
>I guess I'm wondering if this should be a little more "balanced" and is
>there a way to change this situation or is it even necessary?
>
>I know that since we migrated to UC4 (on MPE) most of the production
>jobs that
>UC4 processes run at a DQ.
>
>We only have some higher priority jobs running all the time at CQ and 1
>or 2 of our realtime jobs run at BQ.
>
>Thanks,
>Bruno
>
>Bruno Skiba
>Computer Operator, Corporate HQ
>Phone: +1(603)422-8373
>mailto: bskiba -at- servicecu -dot- org
>
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