Well, the server is not REALLY memory bound according to the output of the top command below. My application just does so much I/O that 8gb of the 24gb are allocated to I/O Buffers by the OS. Are there parameters to limit the amount of memory used for I/O Buffers?
The "lm" processes are database lock managers. The "hciengine" processes are the interface engines running which process transactions and route/tranform/send them to their destinations. The interface engines write a copy of the transaction to a Raima database about 15 times during the process of getting them where they are going, thus the large amount of write activity large amount memory used for I/O Buffers.
Here is the output from the commands suggested. I'm not familiar with most of these statistics/settings, so hopefully someone will be nice enough to explain. :-)
To me it looks like the I/Os Blocked with no PBuf is not too high. This server has been running since May 16th. The one thing I'm not too sure about is the min/max tunables pin, perm and client. I think we left these at the default settings when AIX was installed.
Code:
# vmstat -v
6291456 memory pages
6074032 lruable pages
43335 free pages
5 memory pools
1256482 pinned pages
80.0 maxpin percentage
3.0 minperm percentage
90.0 maxperm percentage
35.9 numperm percentage
2181871 file pages
0.0 compressed percentage
0 compressed pages
35.9 numclient percentage
90.0 maxclient percentage
2181871 client pages
0 remote pageouts scheduled
32 pending disk I/Os blocked with no pbuf
80636 paging space I/Os blocked with no psbuf
2484 filesystem I/Os blocked with no fsbuf
0 client filesystem I/Os blocked with no fsbuf
1737 external pager filesystem I/Os blocked with no fsbuf
The disk activity is not all that high MOST of the time. We do have some archiving that happens 4 times a day, however, even then I don't see much IO Wait going on. It does seem like Disk0 and Disk1 are the busiest. This server is attached to a SAN, so there are many virtual hdisks.
Again, I'm do not know how to read the output of this command, but here it is in case anyone can help.
Code:
# ipcs -m
IPC status from /dev/mem as of Mon Aug 2 08:33:07 CDT 2010
T ID KEY MODE OWNER GROUP
Shared Memory:
m 1048576 0x0d000944 --rw-rw---- root system
m 1048577 0x7800000d --rw-rw-rw- root system
m 1048578 0x7800000c --rw-rw-rw- root system
m 1048579 0x700020a1 --rw------- root system
m 1048580 0x680020a1 --rw-r--r-- root system
m 1048581 0x670020a1 --rw-r--r-- root system
m 2097158 0x2604f589 --rw-rw-rw- hci staff
m 7 0x4401a2a5 --rw-rw-rw- hci staff
m 8 0x5001f9b2 --rw-rw-rw- hci staff
m 9 0x4b00afb2 --rw-rw-rw- hci staff
m 10 0x3c01bae4 --rw-rw-rw- hci staff
m 11 0x3f01e32d --rw-rw-rw- hci staff
m 12 0x3201bcf6 --rw-rw-rw- hci staff
m 13 0x6a01c7d7 --rw-rw-rw- hci staff
m 14 0x6901c836 --rw-rw-rw- hci staff
m 15 0x7801c198 --rw-rw-rw- hci staff
m 16 0x7b01c81e --rw-rw-rw- hci staff
m 17 0x460198e3 --rw-rw-rw- hci staff
m 18 0x22019b61 --rw-rw-rw- hci staff
m 19 0x5c01d841 --rw-rw-rw- hci staff
m 20 0x4001b0a2 --rw-rw-rw- hci staff
m 21 0x3501d208 --rw-rw-rw- hci staff
m 22 0x5901e867 --rw-rw-rw- hci staff
m 23 0x3301eba7 --rw-rw-rw- hci staff
m 24 0x470193fa --rw-rw-rw- hci staff
m 25 0x5301d575 --rw-rw-rw- hci staff
m 26 0x4501e494 --rw-rw-rw- hci staff
m 27 0x2801f56a --rw-rw-rw- hci staff
m 28 0x3401e5cf --rw-rw-rw- hci staff
m 29 0x4501974d --rw-rw-rw- hci staff
m 30 0x4601f5c8 --rw-rw-rw- hci staff
m 2097183 0x44019293 --rw-rw-rw- hci staff
m 2097184 0x5001d6e0 --rw-rw-rw- hci staff
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08-02-2010