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-tp18902003s134p18902003.html Sent from the Apache Geronimo - Users mailing list archive at Nabble.com.
