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Why OOM is killing my processes?

Why OOM is killing my processes?

2007-07-27       - By Edson Noboru Yamada

 Back
Reply:     1     2  

Hi
I have a RHEL4 running on a HP DL580 G4 machine with 16 GB of RAM and almost
the same of swap.

I?ve been observing that OOM (out of memory killer) has been killing some of
my processes; this is a snapshot
of my /var/log/messages:

Jul 27 00:51:33 ipbbkptb04 kernel: Free pages:     9358032kB (9345152kB
HighMem)
Jul 27 00:51:33 ipbbkptb04 kernel: Active:1331301 inactive:23288 dirty:0
writeback:0 unstable:0 free:2339508 slab:183441 mapped:1276160
pagetables:6881
Jul 27 00:51:33 ipbbkptb04 kernel: DMA free:12560kB min:16kB low:32kB
high:48kB active:0kB inactive:0kB present:16384kB pages_scanned:3767
all_unreclaimable?
yes
Jul 27 00:51:33 ipbbkptb04 kernel: protections[]: 0 0 0
Jul 27 00:51:33 ipbbkptb04 kernel: Normal free:320kB min:928kB low:1856kB
high:2784kB active:0kB inactive:316kB present:901120kB pages_scanned:66
all_unrecla
imable? no
Jul 27 00:51:33 ipbbkptb04 kernel: protections[]: 0 0 0
Jul 27 00:51:33 ipbbkptb04 kernel: HighMem free:9345152kB min:512kB
low:1024kB high:1536kB active:5325204kB inactive:92836kB present:15859708kB
pages_scanned
:0 all_unreclaimable? no
Jul 27 00:51:33 ipbbkptb04 kernel: protections[]: 0 0 0
Jul 27 00:51:33 ipbbkptb04 kernel: DMA: 4*4kB 4*8kB 4*16kB 3*32kB 3*64kB
1*128kB 1*256kB 1*512kB 1*1024kB 1*2048kB 2*4096kB = 12560kB
Jul 27 00:51:33 ipbbkptb04 kernel: Normal: 0*4kB 0*8kB 0*16kB 2*32kB 0*64kB
0*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 320kB
Jul 27 00:51:33 ipbbkptb04 kernel: HighMem: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB
1*128kB 0*256kB 538*512kB 425*1024kB 162*2048kB 2027*4096kB = 9345152kB
Jul 27 00:51:33 ipbbkptb04 kernel: Swap cache: add 0, delete 0, find 0/0,
race 0+0
Jul 27 00:51:33 ipbbkptb04 kernel: 0 bounce buffer pages
Jul 27 00:51:33 ipbbkptb04 kernel: Free swap:       15361176kB
Jul 27 00:51:33 ipbbkptb04 kernel: 4194303 pages of RAM
Jul 27 00:51:33 ipbbkptb04 kernel: 3702486 pages of HIGHMEM
Jul 27 00:51:33 ipbbkptb04 kernel: 296839 reserved pages
Jul 27 00:51:33 ipbbkptb04 kernel: 2419671 pages shared
Jul 27 00:51:33 ipbbkptb04 kernel: 0 pages swap cached
Jul 27 00:51:33 ipbbkptb04 kernel: Out of Memory: Killed process 29225
(bptm).



My question is: why is OOM killing my processes if there was a lot of free
pages?

TIA
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