[Info-vax] vms base priority watch

[VAXman- at SendSpamHere.ORG]

In article <867e4692-edfd-457a-beff-04414b3b76c3 at g2g2000vbl.googlegroups.com>, abrsvc <dansabrservices at yahoo.com> writes:
>On Jul 11, 12:01=A0pm, "Richard B. Gilbert" <rgilber... at comcast.net>
>wrote:
>> On 7/11/2011 11:09 AM, pcovie... at gmail.com wrote:
>>
>>
>>
>>
>>
>> > On Jul 11, 10:43 am, "Richard B. Gilbert"<rgilber... at comcast.net>
>> > wrote:
>> >> On 7/11/2011 9:46 AM, Bob Koehler wrote:
>>
>> >>> In article<1f612927-5e98-44e0-91e2-d889916c4... at gh5g2000vbb.googlegro=
>ups.com>, "pcovie... at gmail.com"<pcovie... at gmail.com> =A0 =A0writes:
>> >>>> ok well. I did ask a yes/no question! me bad! =A0yes I understand th=
>e
>> >>>> non-prived user would not do this but... we have given users the
>> >>>> rights to do this early in the morning to get their jobs completed,
>> >>>> when there are less users on the system.
>>
>> >>> =A0 =A0 =A0If the system is otherwize idle at that time, that should =
>have no affect.
>> >>> =A0 =A0 =A0If only some users get to do this in the ealy hours, then =
>it's worth while.
>>
>> >>> =A0 =A0 =A0VMS does not delay lowpriorityprocesses just to make them =
>take
>> >>> =A0 =A0 =A0longer, it there are no higherpriorityprocesses doing anyt=
>hing.
>>
>> >> I can recall occasions during which a job was getting 99 percent of th=
>e
>> >> CPU at PriorityOne. =A0The "hunt and peck" typists never noticed it!
>>
>> > thanks everyone, =A0I know it isn't the best solution, but as I said I
>> > just started the job and need to pick and choose what comes first...
>> > thinking about this some more and doing some digging I thought
>> > accounting would tell you who might have issued a command? =A0 after a
>> > year some things are still fuzzy, so haven't come up with anything
>> > yet, but I'm wondering as someone pointed out that what if they hit
>> > the time between the hour! =A0so it might be best to see if I can audit
>> > who issued the command and see what time? =A0any ideas?
>>
>> Accounting is not going to tell you who issued a command unless that
>> command created a process. =A0In Unix you can't blink without starting a
>> process or two. =A0Not so in VMS!
>>
>> Maybe you should back up a bit and define the problem you are trying to
>> solve!- Hide quoted text -
>>
>> - Show quoted text -
>
>Since VMS uses a preemptive scheduling process, the raising of
>priority rarely has much effect unless the process is compute bound.
>Most of the time, the process will be in LEF mode (5 points higher
>than base priority).  The first task is to lower the priority boost by
>1 so that the next interrupt for another process can get CPU.  This
>will continue until the process has reached base priority where the
>majority of the CPU work will occur.  Raising the base higher than 4
>rarely makes too much of a difference for the raised process, it CAN
>however affect other processes rather drastically.  Changing
>priorities should be done with care.
>
>Perhaps you should gather baseline info about current process
>priorities using monitor.  This whole idea of changing the priorities
>may be a smoke screen.

;)

-- 
VAXman- A Bored Certified VMS Kernel Mode Hacker    VAXman(at)TMESIS(dot)ORG

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