04-10-2010
collectl - your one-stop tool
I just answered a previous note about memory usage and pointed the user at collectl. There are a couple of things worth noting - collectl is VERY lightweight, on the order of using <0.1% of the cpu when sampling system data every 10 seconds! When trying to track down something tricky you ALWAYS need fine grained time or you never see those spikes that so ofter offer at the least expected time. In fact if you want to sample once a second you're still <1%.
But back to the problem at hand. While you can certainly run ps from cron every hours there are 2 reasons why you might not want to. First of all, sampling once an hour isn't really going to help much unless you get real lucky. Second, even if ps did tell you something you might also want to get other things that happened at the time in question like CPU, memory usage, open files, etc. but you don't have access to it because you didn't think to ask ahead of time.
With collectl, you just start it running as a daemon and it will collect more than you thought of to ask. It will even collect info on your slab usage and a runaway allocation of slab memory can certainly trigger the out-of-memory killer.
Just note that collectl only monitors slabs/processes once a minute because there are high load tasks...
-mark
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