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Solaris 10 - memory management confusion

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Operating Systems Solaris Solaris 10 - memory management confusion
# 1  
Old 11-22-2012
Solaris 10 - memory management confusion
Hello

i have a Problem - my Server is running with following MEM Information (from TOP):
Code:
Memory: 32G phys mem, 4195M free mem, 10G total swap, 9788M free swap

So i think - no problem, 4GB Free, not swapin.

So - our programmer wants to know what process taking how much memory - i searched...
prstat shows me:

Code:
   PID USERNAME  SIZE   RSS STATE  PRI NICE      TIME  CPU PROCESS/NLWP       
 23777 oracle   8115M 8023M sleep   59    0   0:00:29 0.1% oracle/1
  8124 oracle   8115M 8028M sleep   59    0   0:04:32 0.0% oracle/1
 29072 oracle   8114M 8021M sleep   59    0   0:00:00 0.0% oracle/1
  6601 oracle   8114M 8016M sleep   59    0   0:10:00 0.0% oracle/1
  6488 oracle   8130M 8019M sleep   59    0   0:08:08 0.0% oracle/22
 11791 root        0K    0K sleep   99  -20   9:51:32 0.0% zpool-oracle/150
 29083 root     3956K 3168K cpu7    59    0   0:00:00 0.0% prstat/1
     1 root     2548K  740K sleep   59    0   1:27:21 0.0% init/1
  6559 oracle   8119M 8028M sleep   59    0   0:03:11 0.0% oracle/1
 29631 root     2232K 1812K sleep   59    0   0:00:27 0.0% execute.rc/1
  1874 oracle   3124M 3021M sleep   59    0   0:02:37 0.0% oracle/11
  6497 oracle   8119M 8020M sleep   59    0   0:03:20 0.0% oracle/15
 18015 oracle   8115M 8027M sleep   59    0   0:00:05 0.0% oracle/1
  1884 oracle   3122M 3025M sleep   59    0   0:04:41 0.0% oracle/1
  1880 oracle   3127M 3034M sleep   59    0   0:03:10 0.0% oracle/1
 11797 root        0K    0K sleep   99  -20   0:44:03 0.0% zpool-oraclelog/150
   885 noaccess  157M   91M sleep   59    0   0:38:43 0.0% java/30
   439 root     6880K 2332K sleep   59    0   0:29:38 0.0% inetd/4
 21778 oracle   8114M 8023M sleep   59    0   0:00:00 0.0% oracle/1
 25891 munin    9224K 1736K sleep   59    0   0:00:00 0.0% httpd/1
  1864 oracle   3123M 3021M sleep   59    0   0:01:46 0.0% oracle/1
 12904 hpsmh      19M 5096K sleep   59    0   0:00:03 0.0% hpsmhd/1
   757 root     5732K 1336K sleep   59    0   0:00:00 0.0% dtlogin/1
   643 root     3424K 1088K sleep   59    0   0:00:00 0.0% dmispd/1
   626 root     8224K 4208K sleep   59    0   0:05:12 0.0% snmpd/1
   610 root     3536K  868K sleep   59    0   0:00:00 0.0% lpsched/1
   607 smmsp    9096K 1412K sleep   59    0   0:00:08 0.0% sendmail/1
   602 root     3928K 1156K sleep   59    0   0:00:00 0.0% sshd/1
 11726 hpsmh      18M 4136K sleep   59    0   0:00:03 0.0% hpsmhd/1
  7539 oracle   8114M 8021M sleep   59    0   0:00:00 0.0% oracle/1
   606 root     9096K 1772K sleep   59    0   0:01:01 0.0% sendmail/1
 21782 oracle   8117M 8033M sleep   59    0   0:00:04 0.0% oracle/1
   550 root     4560K 1676K sleep   59    0   0:02:02 0.0% syslogd/15
 22148 root       15M 6264K sleep   59    0   0:16:39 0.0% Xorg/1
 21774 oracle   8114M 8023M sleep   59    0   0:00:00 0.0% oracle/1
   604 root     2540K 1232K sleep   59    0   0:00:02 0.0% snmpdx/1
   758 root     2596K  780K sleep   59    0   0:00:00 0.0% fbconsole/1
  6580 oracle   8116M 8029M sleep   59    0   0:00:16 0.0% oracle/1
   603 root       24M 5304K sleep   59    0   0:00:41 0.0% fmd/20
   532 root     6300K 1808K sleep   59    0   0:00:09 0.0% automountd/3
 25848 oracle   3122M 3031M sleep   59    0   0:00:00 0.0% oracle/1
   530 root     3108K 1520K sleep   59    0   0:00:00 0.0% vold/5
   531 root     5980K  828K sleep   59    0   0:00:00 0.0% automountd/2
   422 root     1472K  764K sleep   59    0   0:00:15 0.0% utmpd/1
   421 root     2512K 1100K sleep   59    0   0:00:00 0.0% ttymon/1
  6384 oracle   8115M 8017M sleep   59    0   0:01:58 0.0% oracle/1
   428 root     2492K 1140K sleep   59    0   0:00:00 0.0% ttymon/1
   404 root     3212K 1044K sleep   59    0   0:01:39 0.0% hpasmlited/10
   402 hpsmh      19M 5076K sleep   59    0   0:00:03 0.0% hpsmhd/1
   401 hpsmh      18M 5060K sleep   59    0   0:00:03 0.0% hpsmhd/1
   400 hpsmh      18M 5080K sleep   59    0   0:00:03 0.0% hpsmhd/1
 29070 root     1380K  812K sleep   59    0   0:00:00 0.0% sleep/1
   397 root     4180K 1072K sleep   59    0   0:00:00 0.0% rotatelogs/1
   347 daemon   2480K  920K sleep   60  -20   0:00:00 0.0% lockd/2
   331 daemon   2496K  940K sleep   60  -20   0:00:00 0.0% nfs4cbd/2
   399 hpsmh      19M 4476K sleep   59    0   0:00:03 0.0% hpsmhd/1
   408 root     2116K 1008K sleep   59    0   0:00:00 0.0% sac/1
   394 root     1460K  884K sleep   59    0   0:00:00 0.0% sh/1
   451 root     2104K  812K sleep   59    0   0:00:00 0.0% smcboot/1
   339 daemon   2840K  984K sleep   59    0   0:00:00 0.0% statd/1
   322 daemon   2888K  924K sleep   59    0   0:00:00 0.0% rpcbind/1
   450 root     2104K 1028K sleep   59    0   0:00:00 0.0% smcboot/1
   200 root     4688K  916K sleep   59    0   0:00:00 0.0% picld/5
   131 root     4256K 1140K sleep   59    0   0:00:45 0.0% devfsadm/7
   127 root     9792K 3892K sleep   59    0   0:25:37 0.0% nscd/39
Total: 174 processes, 1395 lwps, load averages: 0.41, 0.41, 0.41

There is my confution, total amount of "rss" or "size" is MUCH more bigger then the physical memory on the server. can anyone please explain me this ?

Very THANKS
greets
uwe
# 2  
Old 11-22-2012
It is because of shared memory segments that Oracle is using heavily.
# 3  
Old 11-22-2012
thank you - i understand.

So, how can i figure out a real usage of memory ?

THANX
# 4  
Old 11-22-2012
Or another way to state it - shared memory gets "counted" for each process that is sharing it. So if 10 processes share one memory block, it gets counted 10 times, and the memory use reported is over reported by 9 blocks.

This happens with shared libraries, too.

A more useful display is
Code:
prstat -Z

at the bottom is the correct percent of system memory being used by the zone you are in. If you are in the root (or global) zone, you can see all zones memory consumption.
# 5  
Old 11-22-2012
You can also check
Code:
prstat -a

The report at the bottom will show memory usage by users, so you will see how much memory is used by "oracle" user.
# 6  
Old 11-22-2012
THANK you - thats great !!!!
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