Running out of LowMem with Ubuntu PAE Kernel and 32GB of RAM

Posted by magneticMonster on Server Fault See other posts from Server Fault or by magneticMonster
Published on 2010-12-29T22:48:22Z Indexed on 2012/10/15 3:42 UTC
Read the original article Hit count: 671

Filed under:

linux

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ubuntu

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memory

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kernel

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pae

I'm running a Java data import process on a 32-bit Ubuntu 10 PAE kernel machine. After running the process for a while, the oom-killer zaps my Java process. After some Googling and digging through docs, it looks like the system is running out of LowMem. I started the process for the third time and am watching free -lm show me Low: 464 386 77 with the free value (77MB) slowly decreasing.

Why am I running out of lowmem and how do I increase it?

Some details:

$ cat /proc/sys/vm/lowmem_reserve_ratio
256     256      32
$ free -lm
             total       used       free     shared    buffers     cached
Mem:         32086      24611       7475          0          0      24012
Low:           464        407         57
High:        31621      24204       7417
-/+ buffers/cache:        598      31487
Swap:         2047          0       2047

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