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03-27-2012 05:24 AM
03-27-2012 05:24 AM
Hello Experts,
Need your help. I am having one hp p4440 server running HP-UX 11.11. We are facing performance issue on this server.
O/P of swapinfo:
#swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 4096 0 4096 0% 0 - 1 /dev/vg00/lvol2
dev 20000 0 20000 0% 0 - 1 /dev/vg00/lvol10
reserve - 4529 -4529
memory 15756 14739 1017 94%
total 39852 19268 20584 48% - 0 -
From swapinfo O/P Physical memory utilisation is always more than 90% but swap utilisation is 0% why so?
#top
25h[m[H[2J7[1;46r8System: ofdmprod[38CTue Mar 27 13:02:37 2012
Load averages: 0.10, 0.09, 0.09
89 processes: 164 sleeping, 23 running, 2 zombies
Cpu states:
CPU LOAD USER NICE SYS IDLE BLOCK SWAIT INTR SSYS
0 0.09 2.0% 0.0% 0.0% 98.0% 0.0% 0.0% 0.0% 0.0%
1 0.10 3.9% 0.0% 2.9% 93.1% 0.0% 0.0% 0.0% 0.0%
2 0.12 3.9% 0.0% 0.0% 96.1% 0.0% 0.0% 0.0% 0.0%
3 0.09 2.9% 0.0% 3.9% 93.1% 0.0% 0.0% 0.0% 0.0%
--- ---- ----- ----- ----- ----- ----- ----- ----- -----
avg 0.10 2.9% 0.0% 2.0% 95.1% 0.0% 0.0% 0.0% 0.0%
Memory: 4773960K (2826236K) real, 5163184K (3017292K) virtual, 2550156K free Page# 1/7
CPU TTY PID USERNAME PRI NI SIZE RES STATE TIME %WCPU %CPU COMMAND
? 27711 ofsa[5C154 20 49700K 19472K sleep 8:46 9.14 9.13 ofsrm
? 24488 oracle 148 20 4003M 251M sleep 245:04 8.68 8.66 ora_j000_DWPRD
? 27716 oracle 156 20 3764M 9668K sleep 39:10 6.30 6.29 oracleDWPRD
[B 3 ? 9135 oracle 154 20 3762M 8708K sleep 3:07 1.61 1.60 oracleDWPRD
[B 3 ? 3093 oracle 148 20 3923M 154M sleep 165:38 1.48 1.48 ora_dbw0_DWPRD
[B 1 ?[6C39 root[5C152 20 13632K 13632K run[5C47:42 0.88 0.88 vxfsd
[B 3 ? 2575 root[5C152 20 56288K 22116K run[5C67:40 0.26 0.26 opcmona
[B 3 ? 3095 oracle 148 20 3782M 22468K sleep 273:26 0.21 0.21 ora_lgwr_DWPRD
[B 3 ? 1991 root[5C152 20 52308K 9648K run[6C8:10 0.19 0.19 ovcd
[B 3 ? 1964 root[5C-16 20 37776K 16828K run 129:55 0.18 0.18 midaemon
[B 0 ? 2429 root[5C152 20 36788K 5892K run[6C1:57 0.18 0.18 ovconfd
[B 3 ? 2004 root[5C152 20 32968K 9036K run[6C8:31 0.16 0.16 ovbbccb
[B 1 ? 2188 root[5C152 20 109M 29848K run[5C81:29 0.16 0.16 coda
[B 1 ? 2254 root[5C152 20 25168K 4920K run[6C1:07 0.12 0.12 vxsvc
[B 0 ? 2570 root[5C152 20 32988K 4600K run[5C18:18 0.12 0.12 opcacta
[B 3 ? 2574 root[5C152 20 32532K 5244K run[5C51:06 0.12 0.12 opcle
[B 1 ? 1279 root[5C152 20 62344K 5760K run[6C1:50 0.10 0.10 cimprovagt
[B 1 ? 2604 root[5C152 20 61576K 7696K run[5C11:09 0.09 0.09 agtrep
[B 0 ?[5C548 root[5C152 20 2300K 380K run[6C5:57 0.08 0.08 syncer
[B 3 ? 2469 root[5C152 20 34924K 6296K run[6C1:58 0.08 0.08 opcmsga
[B 3 ?[6C21 root[5C147 20 32K 32K sleep 8:43 0.06 0.06 lvmkd
[B 1 ? 1219 root[5C154 20 6928K 1324K sleep 1:55 0.06 0.06 mib2agt
[B 1 ? 1276 root[5C152 20 39224K 7444K run[6C0:02 0.06 0.06 cimserver
[B 3 ? 2018 root[5C152 20 3972K 1116K run[6C0:01 0.06 0.06 windu_registryd50
[B 1 ?[6C19 root[5C147 20 32K 32K sleep 8:48 0.06 0.06 lvmkd
[B 3 ? 1182 root[5C154 20 3684K 492K sleep 4:23 0.05 0.05 sendmail:
[B 1 ? 3068 oracle 154 20 3763M 10564K sleep 3:23 0.05 0.05 ora_pmon_DWPRD
[B 3 pts/0 5043 root[5C178 20 7060K 5076K run[6C0:00 1.00 0.05 top
[B 2 ? 3097 oracle 148 20 3770M 17476K sleep 10:16 0.05 0.05 ora_ckpt_DWPRD
[B 1 ?[6C24 root[5C147 20 32K 32K sleep 8:46 0.04 0.04 lvmkd
[B 0 ? 3759 oracle 152 20 39320K 4420K run[5C19:44 0.04 0.04 tnslsnr[78C
Any help will be very much appreciated.
Regards
Syed
Syed
Solved! Go to Solution.
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03-27-2012 07:19 AM
03-27-2012 07:19 AM
Re: memory utilisation very high
>swapinfo physical memory utilisation is always more than 90% but swap utilisation is 0% why so?
The system is using pseudo-swap instead of device swap. (This is a good thing.)
Right now the system is idle, so your output doesn't tell us much.
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03-27-2012 07:52 AM
03-27-2012 07:52 AM
Re: memory utilisation very high
Hi Dennis,
Thanks for the reply. How to check the physical memory utilisation? And when server will used Pseudo-swap and when device swap?
Thanks
Syed
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03-27-2012 07:55 AM
03-27-2012 07:55 AM
Re: memory utilisation very high
>How to check the physical memory utilisation?
Use a tool like glance/gpm.
>And when server will used Pseudo-swap and when device swap?
Using pseudo-swap is good, device swap is bad. The OS will always try to use the former.
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03-29-2012 06:34 AM
03-29-2012 06:34 AM
Solutionyour memory utilization will always be high since any unused memory that is not being used for processes will be used for buffer cache (11.23 and below) or file cache (11.31). This means that any unused memory speeds up your I/O.
When you do a swapinfo -t you see no device swap being used.. That is good.. That means that all of the processes fit in memory plus you are using the rest of memory for a buffer cache.
The pseudo swap that is mentioned is just a way for the system to fully use its memory.
Normally when a process loads in memory it must reserve swap space. If you have 8 GB of memory and 4 GB of swap this would only allow you to run 4GB of programs.. With pseudo swap we make the OS think we have 12 GB of swap space to reserve so we can run 12 GB of programs before we are out of swap. The overall effect is we are able to use all of our memory even if we do not have as much swap space as we do memory.. Now a days many systems have terribytes of memory to run everything in memory but we do not need terribytes of swap space.
Hope this clears things up.
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03-31-2012 11:09 PM
03-31-2012 11:09 PM
Re: memory utilisation very high
Hi Emil,
Thanks.!!!
Syed