[ic] How to determine cause of load spikes.

ic at 3edge.com ic at 3edge.com
Sat Nov 4 11:19:06 EST 2006

DB writes: 

> 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. 
> DB

Have you tried: 

strace -p 26248 

Perhaps that gives you some more insight? 



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