Dave Smith wrote:
> down? If so, you can sometimes see useful info being spewed there. This
> happened to one of my servers, and it was indeed running out of memory.
> If you see anything about "OOM", that's what's going on.
>
> In my case, Apache 2 was running out of memory because my MaxClients
> (and related stuff in the apache config) were too high for the amount of
> RAM I had.
>
By the way, I wrote a simple shell script and ran it in cron every 5
minutes to tell me if I was running out of memory, and if so, who were
the greedy processes. Here's the script for your hacking pleasure:
#!/bin/bash
low_mem_threshold=100
free_mem_mb=`free -m | grep buffers/cache | awk '{print $4}'`
if [ "$free_mem_mb" -lt $low_mem_threshold ]; then
mail -a "From: YOUR_EMAIL_ADDRESS_HERE" -s 'Low memory report'
YOUR_EMAIL_ADDRESS_HERE << EOM
Memory summary:
`free -m | sed 1d | sed 1d | head -1 | awk '{print " Total: " $3+$4 "
MB, Used: " $3 " MB, Free: " $4 " MB"}'`
Top memory eating processes:
`ps -eo vsz,comm,args | sort -nr | grep -v '^ *0' | grep -v VSZ`
EOM
fi
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