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тАО04-12-2005 08:39 AM
тАО04-12-2005 08:39 AM
ridiculous GBLPAGES Autogen values under VMS 7.2-2
The following is from AGEN$PARAMS.REPORT on an AS4100 with system memory of 2GB (4194304 pagelets).
GBLPAGES parameter information:
- AUTOGEN parameter calculation has been overridden.
The calculated value was 50397698. The value 50452146 will be used in accordance with the following requirements:
GBLPAGES has been increased by 54448.
GBLPAGES minimum value is 150000.
If I run AUTOGEN later with feedback it doesn't reduce it; it increases it more:
GBLPAGES parameter information:
Feedback information. Old value was 50452146, New value is 50577907
Maximum used GBLPAGES: 205216
Global buffer requirements: 3145728
Pagelets reserved for memory resident sections: 0
Does it hurt anything (i.e. waste memory) to leave GBLPAGES set so high? Should I manually set it to a reasonable number after every AUTOGEN?
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тАО04-12-2005 12:06 PM
тАО04-12-2005 12:06 PM
Re: ridiculous GBLPAGES Autogen values under VMS 7.2-2
This change started in 7.3 (7.2-2 is a later release than 7.3). I used to have to force GBLPAGES higher for my application.
The memory used isn't going to be significant and, if you have an application using global pages, tuning is required less frequently.
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тАО04-12-2005 05:40 PM
тАО04-12-2005 05:40 PM
Re: ridiculous GBLPAGES Autogen values under VMS 7.2-2
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тАО04-12-2005 07:05 PM
тАО04-12-2005 07:05 PM
Re: ridiculous GBLPAGES Autogen values under VMS 7.2-2
As I see it, this means that the limit has been removed and you no longer have protection against a program eating them all. Just as in Unix.
Wim
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тАО04-12-2005 07:17 PM
тАО04-12-2005 07:17 PM
Re: ridiculous GBLPAGES Autogen values under VMS 7.2-2
I consider putting GBLPAGES= in modparams to deactivate this "no limit".
Wim
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тАО04-12-2005 10:45 PM
тАО04-12-2005 10:45 PM
Re: ridiculous GBLPAGES Autogen values under VMS 7.2-2
MAX_GBLPAGES=
in MODPARAMS.DAT
Purely Personal Opinion
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тАО04-12-2005 10:50 PM
тАО04-12-2005 10:50 PM
Re: ridiculous GBLPAGES Autogen values under VMS 7.2-2
A system manager should setup a good value and change it when it is to small.
I already set fixed values for the number of processes and others. Doing an autogen after something went wrong (e.g. a few hundred processes created "by accident") may lead to a misconfigured system. I also have to be drp ready, thus autogen may not base the value on what he saw.
Wim
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тАО04-13-2005 04:41 PM
тАО04-13-2005 04:41 PM
Re: ridiculous GBLPAGES Autogen values under VMS 7.2-2
What about what is coming from PARAMS.DAT or other files that are behind the scenes? Do any of these files have entries of ADD_GBLPAGES?
There's a good chance that it's time to remove the ADD_GBLPAGES entries and change to MIN_GBLPAGES for good measure
Robert
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тАО04-13-2005 06:03 PM
тАО04-13-2005 06:03 PM
Re: ridiculous GBLPAGES Autogen values under VMS 7.2-2
My MIN_ is 4 GB which is 3 times the amount we need. But the MIN_ coming from autogen itself is 36 GB. So, whatever you ask, the MIN_ from autogen is higher.
That's why I consider a fixed GBLPAGES (which usage we monitor : alarm when 40% used
while not in DRP mode, which is running the cluster on 1 node).
Wim
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тАО08-08-2005 08:56 AM
тАО08-08-2005 08:56 AM
Re: ridiculous GBLPAGES Autogen values under VMS 7.2-2
You end up with a value that is greater than the physical amount of memory on your machine. This is fixed in V7.3 or later of OpenVMS
Regards
Cass