Hi, 1. What's about memory used by JMeter? Does JMeter uses small memory at start point and then memory raises up and up?
2. What option do you use for Threads Group: stop test, stop thread or continue on error? 3. Have you tried to change Transaction Controller to Simple Controller? С уважением, Андрей Похилько -----Original Message----- From: Robert Elliot [mailto:[email protected]] Sent: Thursday, January 14, 2010 8:22 PM To: [email protected] Subject: JMeter performance degrades over time on one machine Hi all, We're experiencing an odd problem with JMeter. We have a simple test - a Transaction Controller with two child HTTP Samplers, one to retrieve a page and one to submit a form on it. We want to measure the total time of the transaction under load (480 transactions a minute). Run on a local dev machine we see the transaction controller's time just above the sum of the two sample times - as you'd expect. Roughly 50 ms. However, we want to run this test as part of our automated build. Run on the build slave (same test, same JMeter version, same parameters, against the same web server) it starts OK, but gradually degrades. What's strange is that the individual HTTP samples remain the same (c. 20ms each) but the transaction controller sample steadily increases up to 60 seconds! Looking at the timestamps of the sample and httpSamples it appears that time is being lost before each of the httpSamples. Running top seems to show that the CPU eventually hit 100%, though we believe that this may be the sum of 2 CPUs at c.50%; locally the CPU never gets anywhere near that. The buildslave is not particularly underpowered, it's a reasonable virtual machine. And it has the same problem even when we reduce the number of threads to 2 (with a ramp up time of 60 seconds). We're a bit baffled. Has anyone experienced similar and managed to solve it? Setting log level to debug reveals nothing. Thanks, Rob --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
