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... > > -- View this message in context: http://www.nabble.com/large-scale-app..-random-spiking-on-even-static-files%21-tp18902003s134p18902031.html Sent from the Apache Geronimo - Users mailing list archive at Nabble.com.
