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тАО03-26-2008 06:12 AM
тАО03-26-2008 06:12 AM
Priority increases automatically
Though the system is currently not facing any problem due to this, but a process that has been a time slot based one moves to real time is not welcomed, also it is running with priority higher than SWAPPER, which is running at priority 27.
Is there any way of restriction it?
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тАО03-26-2008 06:30 AM
тАО03-26-2008 06:30 AM
Re: Priority increases automatically
$b:
$ set proc/id=xxx/prio=8
$ wait 00:01
$ goto b
But why is it happenning ?
Wim
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тАО03-26-2008 06:31 AM
тАО03-26-2008 06:31 AM
Re: Priority increases automatically
This is almost certainly local code, or local commands, or a local user that's responsible; a trigger within the local environment. (If this were a general error in OpenVMS, there would likely be more reports of this around.)
Enable system service auditing and use it to find out which process here is calling $setpri. The altpri privilege can be audited. Use "set audit /enable=privilege=success=altpri", IIRC. (Somewhat surprisingly, there's no way to directly audit $setpri calls. Weird. HP should consider an enhancement there.)
On no evidence, I would review the code of the image itself, and whatever code you might have around that calls the $setpri system service.
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тАО03-26-2008 06:48 AM
тАО03-26-2008 06:48 AM
Re: Priority increases automatically
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тАО03-26-2008 07:29 AM
тАО03-26-2008 07:29 AM
Re: Priority increases automatically
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тАО03-26-2008 07:46 AM
тАО03-26-2008 07:46 AM
Re: Priority increases automatically
Can you paste the output here?
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тАО03-26-2008 07:51 AM
тАО03-26-2008 07:51 AM
Re: Priority increases automatically
and watch the field Cur/base priority in the display.
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тАО03-26-2008 07:53 AM
тАО03-26-2008 07:53 AM
Re: Priority increases automatically
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тАО03-26-2008 08:00 AM
тАО03-26-2008 08:00 AM
Re: Priority increases automatically
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тАО03-26-2008 08:05 AM
тАО03-26-2008 08:05 AM
Re: Priority increases automatically
If so, as Hoff said, it is almost certainly not something that is part of stock standard VMS that is modifying it.
The only thing the VMS schedular modifies is the current priority, and that only up to base + PRI$_TICOM (boost of 6, which is immediately dropped by one when it is scheduled). And that will never promote the current priority above 15 (it will not move it into the realtime priorities).
So what other software do you have running? Any "fair share" priority adjusters?
RE:"Both are drifting"
When the base is in the realtime range, the current priority should be the same as the base, i.e. VMS shouldn't be applying dynamic priority adjustments to real time processes. Is that consistent with what you see?
Jon