out of memory

Hi

I have a dedicated database server with 16 GB of RAM.

and the oom-killer is killing my database

this is the output kernel:

postmaster invoked oom-killer: gfp_mask=0xd0, order=1, oomkilladj=0
Pid: 16667, comm: postmaster Tainted: G W 2.6.27.6 #7
[<c10510f9>] oom_kill_process+0x103/0x1d5
[<c11c14cc>] security_capable+0x9/0xa
[<c1050f0d>] badness+0x118/0x201
[<c10513fc>] out_of_memory+0x231/0x265
[<c1053300>] __alloc_pages_internal+0x322/0x447
[<c106ac5e>] alloc_pages_current+0x59/0x89
[<c1051c2c>] __get_free_pages+0xa/0x16
[<c101f815>] copy_process+0xa2/0xeaa
[<c1020683>] do_fork+0x66/0x2c3
[<c1001a59>] sys_clone+0x32/0x36
[<c100334a>] syscall_call+0x7/0xb
=======================
Mem-Info:
Node 0 DMA per-cpu:
CPU 0: hi: 0, btch: 1 usd: 0
CPU 1: hi: 0, btch: 1 usd: 0
CPU 2: hi: 0, btch: 1 usd: 0
CPU 3: hi: 0, btch: 1 usd: 0
CPU 4: hi: 0, btch: 1 usd: 0
CPU 5: hi: 0, btch: 1 usd: 0
CPU 6: hi: 0, btch: 1 usd: 0
CPU 7: hi: 0, btch: 1 usd: 0
CPU 8: hi: 0, btch: 1 usd: 0
CPU 9: hi: 0, btch: 1 usd: 0
CPU 10: hi: 0, btch: 1 usd: 0
CPU 11: hi: 0, btch: 1 usd: 0
CPU 12: hi: 0, btch: 1 usd: 0
CPU 13: hi: 0, btch: 1 usd: 0
CPU 14: hi: 0, btch: 1 usd: 0
CPU 15: hi: 0, btch: 1 usd: 0
Node 0 Normal per-cpu:
CPU 0: hi: 186, btch: 31 usd: 0
CPU 1: hi: 186, btch: 31 usd: 30
CPU 2: hi: 186, btch: 31 usd: 0
CPU 3: hi: 186, btch: 31 usd: 0
CPU 4: hi: 186, btch: 31 usd: 0
CPU 5: hi: 186, btch: 31 usd: 0
CPU 6: hi: 186, btch: 31 usd: 26
CPU 7: hi: 186, btch: 31 usd: 26
CPU 8: hi: 186, btch: 31 usd: 0
CPU 9: hi: 186, btch: 31 usd: 0
CPU 10: hi: 186, btch: 31 usd: 0
CPU 11: hi: 186, btch: 31 usd: 0
CPU 12: hi: 186, btch: 31 usd: 0
CPU 13: hi: 186, btch: 31 usd: 0
CPU 14: hi: 186, btch: 31 usd: 0
CPU 15: hi: 186, btch: 31 usd: 25
Node 0 HighMem per-cpu:
CPU 0: hi: 186, btch: 31 usd: 0
CPU 1: hi: 186, btch: 31 usd: 30
CPU 2: hi: 186, btch: 31 usd: 0
CPU 3: hi: 186, btch: 31 usd: 0
CPU 4: hi: 186, btch: 31 usd: 0
CPU 5: hi: 186, btch: 31 usd: 167
CPU 6: hi: 186, btch: 31 usd: 25
CPU 7: hi: 186, btch: 31 usd: 19
CPU 8: hi: 186, btch: 31 usd: 0
CPU 9: hi: 186, btch: 31 usd: 0
CPU 10: hi: 186, btch: 31 usd: 0
CPU 11: hi: 186, btch: 31 usd: 0
CPU 12: hi: 186, btch: 31 usd: 0
CPU 13: hi: 186, btch: 31 usd: 0
CPU 14: hi: 186, btch: 31 usd: 0
CPU 15: hi: 186, btch: 31 usd: 23
Active:1573667 inactive:609150 dirty:46 writeback:107 unstable:0
free:1750894 slab:31196 mapped:538832 pagetables:143359 bounce:0
Node 0 DMA free:3540kB min:64kB low:80kB high:96kB active:0kB inactive:0kB prese nt:15836kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 873 16095 16095
Node 0 Normal free:28132kB min:3744kB low:4680kB high:5616kB active:840kB inacti ve:892kB present:894080kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 121778 121778
Node 0 HighMem free:6971904kB min:512kB low:16836kB high:33160kB active:6293828k B inactive:2435708kB present:15587608kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 0 0 0
Node 0 DMA: 113*4kB 11*8kB 1*16kB 1*32kB 0*64kB 0*128kB 0*256kB 0*512kB 1*1024kB 1*2048kB 0*4096kB = 3660kB
Node 0 Normal: 6429*4kB 147*8kB 9*16kB 2*32kB 2*64kB 1*128kB 0*256kB 1*512kB 1*1 024kB 0*2048kB 0*4096kB = 28892kB
Node 0 HighMem: 690211*4kB 364384*8kB 72902*16kB 3650*32kB 17*64kB 50*128kB 5*25 6kB 2*512kB 1*1024kB 0*2048kB 1*4096kB = 6974060kB
1920296 total pagecache pages
0 pages in swap cache
Swap cache stats: add 913280, delete 913280, find 207387/229468
Free swap = 1754452kB
Total swap = 3904552kB
4390911 pages RAM
4161535 pages HighMem
268987 pages reserved
6066507 pages shared
1384540 pages non-shared
Out of memory: kill process 13279 (postmaster) score 546058 or a child
Killed process 13279 (postmaster)

This is the output of free -m before and after the kill

free -m
total used free shared buffers cached
Mem: 16101 9302 6799 0 3 7521
-/+ buffers/cache: 1776 14324
Swap: 3813 2099 1713

free -m
total used free shared buffers cached
Mem: 16101 5606 10494 0 7 5410
-/+ buffers/cache: 188 15912
Swap: 3813 2099 1713

the sysctl.conf with
kernel.shmmax = 10737418240
vm.overcommit_memory = 2

I do not what why the oom-killer kill the postgres if there are available memory.

I would appreciate any help

Regars...

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