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07-05-2011 03:30 AM
07-05-2011 03:30 AM
PATROL detected 84.14/sec memory pages HIGH swap rate
Hi Experts,
Everyday I used to get alerts from BMC Patrol application which is configured for monitoring of my hp-ux boxes, that alert is "PATROL detected 84.14/sec memory pages HIGH swap rate".
OS Info: HP-UX B.11.31
#swapinfo -mnt
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 4096 882 3214 22% 0 - 1 /dev/vg00/lvol2
dev 4096 312 3784 8% 0 - 1 /dev/vg00/swap
reserve - 5797 -5797
memory 13545 11234 2311 83%
total 21737 18225 3512 84% - 0 -
#vmstat 3 5
procs memory page faults cpu
r b w avm free re at pi po fr de sr in sy cs us sy id
3 2 0 1022992 13400 1 0 51 6 0 0 9 3975 39296 2160 20 13 66
3 2 0 1022992 15131 0 0 64 3 0 0 0 2332 185752 1766 20 7 72
4 1 0 970425 13543 0 0 32 1 0 0 0 2330 185483 1811 20 6 74
4 1 0 970425 13319 0 0 16 0 0 0 0 2343 185272 1779 19 6 74
4 1 0 970425 13401 0 0 7 4 0 0 0 2292 188093 2001 20 6 73
Please help me for permanent fix for this alert.
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07-05-2011 04:21 AM
07-05-2011 04:21 AM
Re: PATROL detected 84.14/sec memory pages HIGH swap rate
84 pages/second is a high number and it indicates that you do not have enough RAM. Double the amount of memory installed to 24 GB and add another 4 GB of swap space. The page out rate indicates that there is not enough memory to run everything at the same time, so less important programs are being deactivated and paged out to the swap area. You can also reduce the number of users or processes that are running and that will reduce the page out rate. If you are running a database, reduce the amount of shared memory configured for the database. That may stop the page outs but the database will run much slower.
Page outs (more than 0-20/sec) will be very detrimental to overall performance. Reducing memory usage can also slow down your system. There really isn't much choice except to increase RAM.
Bill Hassell, sysadmin
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07-05-2011 05:02 AM
07-05-2011 05:02 AM
Re: PATROL detected 84.14/sec memory pages HIGH swap rate
Hi Bill,
Thanks for the reply.
#vmstat 2 5
procs memory page faults cpu
r b w avm free re at pi po fr de sr in sy cs us sy id
2 0 0 975067 177856 1 0 51 6 0 0 9 3974 39405 2160 20 13 66
2 0 0 975067 177144 0 0 1 0 0 0 30 2468 170514 409 18 7 74
2 0 0 975067 176748 0 0 0 0 0 0 19 2473 171243 400 18 6 76
2 0 0 948800 176388 0 0 0 0 0 0 12 2378 171065 412 17 5 78
2 0 0 948800 175844 0 0 0 0 0 0 7 2439 169580 394 14 4 82
#
Here, page-in and page-out rate is low.
In normal behaviour of system, how page-in and page-out rates should be?
Actually what do both indicate?
Rgds...
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07-05-2011 07:16 AM
07-05-2011 07:16 AM
Re: PATROL detected 84.14/sec memory pages HIGH swap rate
Shalom,
Your system is 84% or 87% subscribed for memory according to the swapinfo snapshot.
This is a little high and exceeds physical memory. So some processes are being swapped in and out of memory as they are needed by the CPU. This slows down your system, hence the alert.
Ways to deal with it:
1) Add RAM
2) Decrease demand for RAM. Oracle SGA requirements can be reduced. You can reduce the number of daemons running, you can decrease the size of the buffer pool. Any of these things will help.
root@dxd13nfs# kctune | grep cache
...
filecache_max 8153993216 Default Auto
filecache_min 815398912 Default Auto
The system above is not properly tuned. Yours may not be tuned either. Setting the filecache_max to a lower figure will provide you an immediate and possibly large positive impact on memory use.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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07-05-2011 07:58 AM
07-05-2011 07:58 AM
Re: PATROL detected 84.14/sec memory pages HIGH swap rate
Hi:
@Steven E. Protter wrote:Setting the filecache_max to a lower figure will provide you an immediate and possibly large positive impact on memory use.
This is not necessarily true. The manpages for 'filecache_(max|min)' note that "It is recommended that these tunables are left in the automatic (default) state, to allow the system to better balance the memory usage among filesystem I/O-intensive processes and other types of processes."
Your mileage may vary. An empirical evidence-based decision based on performance in your environment is necessary if you want to achieve the best results.
You might find the following whitepaper useful:
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c02465072/c02465072.pdf
Regards!
...JRF...