@Sebb: Yes, you're completely right it does depend on the...
a) Hardware b) allocated memory c) JMeter script d) HTTP/HTTPS So the 70 is with my not so elegant script and HTTPS. After that I start seeing delays in the response times that are not sourced at the application under test. I must also admit that those numbers were last tested with JMeter 2.1.1 Maybe 2.3+ can do more. I don't know. If I find the time I can try and run some tests on this. Cheers Oliver -----Original Message----- From: sebb [mailto:[email protected]] Sent: Friday, 27 February 2009 2:31 a.m. To: JMeter Users List Subject: Re: Use jmeter in multiple CPUs On 26/02/2009, kirk <[email protected]> wrote: > Oliver Erlewein [DATACOM] wrote: > > > Hi Toni, > > > > Just some things I’ve noticed with JMeter/Java... > > > > a) One JVM only supports 2000 concurrent TCP connections. Check your > Time_wait states! > > b) Using HTTPS I've determined that about 70 threads per JVM is about the > max you should do although I haven't investigated it into much detail. Seems > to be pretty independent of processing power. I don't know the value for > HTTP. > > > > Because of such issues I've written my own distributed test harness for > JMeter. What I basically do is start separate instances of JMeter and let > them execute at predetermined times. What I've noticed though is, that > although one JVM/JMeter client can't go above 70 threads I can run multiple > of these on one machine (P4HT 3Ghz). So far I've tried 3 concurrent. That to > me shows that the treading used by Java is not as efficient as the Linux > threading/multitasking. The maximum number of threads will depend a lot on the test plan. Some elements take much more memory that others. I've certainly used 200+ threads with just a Java Request sampler without problems. When you say that 70 threads is the maximum, what is the limiting factor? I.e. what happens when you add more threads? > > > > > I would suggest something other than Java's threading is involved. I've > used 1000's of threads (limited by memory) in a Java application. In fact, I > had 250,000 open sockets from 4 machines talking to a single JVM for a total > of 1,000,000 socket connections all running on RH4 installs. I did *not* use > JMeter for this stress test as the application used Mina and Mina/JMeter > don't seem to mix well. > > Regards, > Kirk > > > --------------------------------------------------------------------- > 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
