[ic] How to determine cause of load spikes.

DB DB at M-and-D.com
Sat Nov 4 11:39:44 EST 2006

I'm running IC 5.4.1 using a mysql database of about 500,000 items on a
dual Xeon box with 4GB of RAM. Once in awhile I'll notice the site
become sluggish. During these periods the cpu load is always fairly
high.  I suspect these events are caused by an inefficient search on the
large products database. See below for an example 'top' output during a
recent event:

top - 11:26:03 up 31 days, 20:50,  1 user,  load average: 1.13, 0.97, 0.67
Tasks: 227 total,   2 running, 223 sleeping,   0 stopped,   2 zombie
Cpu(s): 25.1% us,  0.1% sy,  0.0% ni, 74.9% id,  0.0% wa,  0.0% hi,  0.0% si
Mem:   4040624k total,  3568748k used,   471876k free,   118736k buffers
Swap:  2031608k total,     8664k used,  2022944k free,  1453916k cached

26248 inter     25   0 1367m 1.2g 1880 R  100 32.4   0:47.43 interchange

So I can identify the offending process ID, but how can I determine what
this process is doing to cause such a load? If I can determine what
search is being run or which of my pages is being accessed then I can
probably correct the problem.

Bumping the RAM up to 4GB has drastically reduced the extent of the
problem, but I want to find and correct the real cause of the trouble.


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