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From pc3 <peter.r.cl...@gmail.com>
Subject Re: large-scale app.. random spiking on even static files!
Date Sat, 09 Aug 2008 03:59:50 GMT

Oh yeah, and we're using tomcat as the servlet engine.. thanks!


pc3 wrote:
> 
> hey all -
> 
> so i've spent the past two weeks trying to figure out why my large scale
> application (200m page views per month) is having some serious, yet
> random, spikes in response times.  
> 
> we've got an app running under gero 1.1.1, using hibernate, mysql, etc.  
> i've got the response times down in general by adding memcaching and other
> optimizations but we still see the spikes.. e.g. most of our actions
> return in 0.1 sec, but occasionally (and often enough!) .. we'll see a
> random spike up to 30s from different machines in our cluster. 
> 
> so for kicks tonight i tried running a test against all of our app servers
> not for an action but for a plain .txt file ... and guess what... spiky
> responses just from the txt file!  a 4.9kb text file!  look:
> 
> $profileUrl /blah/Languages.txt
> Host 192.168.1.100
> Time taken for tests:   8.555825 seconds <<<<<<<<<<<<
> Host 192.168.1.101
> Time taken for tests:   0.2064 seconds
> Host 192.168.1.108
> Time taken for tests:   0.1436 seconds
> Host 192.168.1.104
> Time taken for tests:   0.1667 seconds
> Host 192.168.1.112
> Time taken for tests:   0.1444 seconds
> Host 192.168.1.117
> Time taken for tests:   0.4575 seconds
> Host 192.168.1.118
> Time taken for tests:   0.2015 seconds
> Host 192.168.1.119
> Time taken for tests:   0.2003 seconds
> Host 192.168.1.120
> Time taken for tests:   0.1713 seconds
> Host 192.168.1.121
> Time taken for tests:   7.22861 seconds <<<<<<<<<<<<
> Host 192.168.1.122
> Time taken for tests:   0.1615 seconds
> 
> Here are some things to go on:
> 1) we still host a few swfs from these servers that are hit frequently. 
> could these be causing some kind of blocking?
> 2) we have a method in our application that acts as a proxy, taking a url
> as a parameter, fetching the url then dumping it to the response 
> 
> I'm open to any ideas or suggestions as to what could be causing the
> spikiness of response times here for a txt file.. one that never even hits
> our java code.   
> 
> Thanks very much all...
> 
> 

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