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08-12-2003 12:44 AM
08-12-2003 12:44 AM
Itanium 2 ( Hpux 11.22 ) process vhand ...
we have the problem ( on 21 machines ), if Oracle runs, the 'find' - command produces a high performance problem ( vhand runs with 20% CPU-Load and more ).
swapinfo shows memeyory PCT used over 98%, when the problem occurs.
Patch PHKL_28670 memory pressure with JFS3.3 is already installed.
Does anybody know what to do?
Andy Siedler
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08-12-2003 01:55 AM
08-12-2003 01:55 AM
Re: Itanium 2 ( Hpux 11.22 ) process vhand ...
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08-12-2003 08:08 AM
08-12-2003 08:08 AM
Re: Itanium 2 ( Hpux 11.22 ) process vhand ...
As the other poster noted, you would need to set the tunable parameter disksort_seconds to a value of :
1 2 4 8 16 32 64 128 or 256 .
This is the number of seconds it will wait before it goes and handles all requests that have come in during that timeframe.
I would set it HIGH (256) and move it down until you get the performance you are looking for.
By setting it to 256 seconds, you are saying to do best disk access for up to 256 seconds then take care of the old requests.
Hope this helps,
Best regards,
Kent M. Ostby
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08-13-2003 04:21 AM
08-13-2003 04:21 AM
Re: Itanium 2 ( Hpux 11.22 ) process vhand ...
But: vhand comes to end, when I setdisksort_seconds to 128 .
THANK YOU
Andy
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08-13-2003 04:39 AM
08-13-2003 04:39 AM
Re: Itanium 2 ( Hpux 11.22 ) process vhand ...
Can you provide a bit more info please? You say when Oracle is running, a find command will cause the system to start paging? What are the swapinfo and free pages (vmstat's free column) before and after the find command? The find command will cause the OS to populate the inode and buffer caches so this may push your memory usage higher over the paging threshold, hence vhand coming into play. When this happens, as you no doubt well know, system performance is very poor is most cases. To find the buffer cache usage:
# echo bufpages/D|adb -k /stand/vmunix /dev/kmem
Again. before and after totals would be useful.
cheers,
James.
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08-13-2003 05:28 AM
08-13-2003 05:28 AM
Re: Itanium 2 ( Hpux 11.22 ) process vhand ...
here some more info:
RX2600 99MHz, 1GB Memory
before 'find'
swapinfo:
Kb Kb Kb PCT
TYPE AVAIL USED FREE USED
dev 2097152 142020 1955132 7%
reserve - 866000 -866000
memory 667512 637052 30460 95%
vmstat free 1403
during 'find':
swapinfo did not change
vmstat free 777
after 'find' the system returns to state "before". I would like to test dbc_max_pct = 10 and disksort_seconds=128 on machine with appr. 10 oracle-users the next days. I will give a reslult message.
Greetings
Andy
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11-06-2005 09:30 PM
11-06-2005 09:30 PM
Re: Itanium 2 ( Hpux 11.22 ) process vhand ...
is the problem solved with setting "disksort_seconds" to 128?
maybe i have the same problem...
Regads