All,
I'm trying to understand the free memory usage and why it falls below 17G sometimes and what could be causing it. Any pointers would be appreciated.
root@prod1 # prtconf
System Configuration: Sun Microsystems sun4u
Memory size: 32768 Megabytes
[postgres@prod1 ~]$ vmstat 5 10
kthr memory page disk faults cpu
r b w swap free re mf pi po fr de sr 1m 1m 1m m1 in sy cs us sy id
0 0 0 51713480 21130304 58 185 325 104 104 0 0 23 3 7 1 488 604 573 1 2 97
0 0 0 51048768 18523456 6 10 0 192 192 0 0 4 0 3 0 527 753 807 2 1 97
0 0 0 51713480 21130304 58 185 325 104 104 0 0 1 23 3 7 488 604 573 1 2 97
0 0 0 51067112 18538472 0 1 0 171 171 0 0 4 8 0 4 522 573 740 2 1 97
0 0 0 51072744 18542992 0 0 0 187 187 0 0 0 22 0 7 532 657 780 2 1 97
0 0 0 51069944 18540736 146 1729 3 174 174 0 0 0 9 0 3 526 3227 944 4 5 91
0 0 0 51065728 18537360 32 33 0 192 192 0 0 0 20 0 3 522 1147 927 3 2 95
0 0 0 51065728 18537336 0 0 0 190 190 0 0 0 26 0 3 517 628 789 2 1 97
0 0 0 51065728 18537336 0 0 0 168 168 0 0 0 25 0 11 517 668 810 2 2 96
0 0 0 51062960 18535152 0 165 2 190 190 0 0 14 29 0 4 552 732 808 2 1 97
prstat -am
NPROC USERNAME SWAP RSS MEMORY TIME CPU
21 postgres 8312M 8300M 25% 112:24:15 2.1%
53 root 347M 236M 0.7% 130:52:02 0.1%
7 daemon 708M 714M 2.2% 21:53:05 0.0%
4 mot 5552K 15M 0.0% 0:00:00 0.0%
1 smmsp 1384K 5480K 0.0% 0:00:59 0.0%
[postgres@prod1]$ ps -eaf | grep postgres | wc -l
24
max_connections = 600
shared_buffers = 8000MB
temp_buffers = 8MB
work_mem = 2MB
maintenance_work_mem = 256MB
max_fsm_pages = 2048000
max_fsm_relations = 2000
effective_cache_size = 4000MB
Thanks,
Stalin