Can you provide us with your box configuration? OS distribution and version, JDK version, JMeter version, Hardware spec.
Try with other configurations of GC like -Xincgc, -XX:UseParallelOldGC, -XX:UseConcMarkSweepGC, etc (one at a time) and compare the results. Try with -XX:AggressiveHeap (JDK 1.4) or -XX:+AggressiveOpts (JDK 1.5+) instead of -Xms and -Xmx. ( http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html ) I work with a distributed environment with 3 JMeter servers per machine (CentOS5, 6GB RAM, 2-cores processor, 20GB HD), using 1.5GB heap per JMeter server. This configuration hold almost 300 threads per JMeter server with no problems. Sometimes a big heap mess up more than help. Regards. Flávio Cysne 2012/7/27 Deepak Goel <[email protected]> > Hey > > You might need a bigger hardware box, i guess :) > > :) > Deepak > > On 7/25/12, Philippe Mouawad <[email protected]> wrote: > > Hello, > > Read this : > > http://jmeter.apache.org/usermanual/best-practices.html > > > > Ensure you are not using View Results Tree or any other costly listeners. > > > > After checking all these points don't jump to conclusion that other > > parameters are OK if your original load test tool is reporting OK. > > Built-in samplers are rather highly tested and used , so i am not sure > > writing your own will help. > > > > Regards > > Philippe M. > > > > On Tue, Jul 24, 2012 at 8:28 PM, unjc email <[email protected]> > wrote: > > > >> Hi all, > >> > >> I have a test plan with 100 threads of HTTP Request samplers hitting a > >> web server via proxy server. My goal is to hammer the server as fast > >> as possible for an hour. When I run the test for first 30 seconds, > >> the throughput is excellent; slowly I found it keeps dropping. I am > >> sure it's not a problem with the network, proxy or web server because > >> the other load-testing tool has been working fine before I switch to > >> try Jmeter. > >> > >> I found that Jmeter consumes lots of memory and cpu cycles during the > >> test. I have tried "Statistical" and "Stripped" mode, along with > >> 2048M heap size. Nothing really helps to keep the test running for > >> long period of time. The java process is one hungry monster in the > >> top stats. Is there any lighter sampler available (that supports > >> proxy, custom originating IP, and https)? If not, is there any good > >> document that could help start writing my own plugin? Any comment or > >> advice will be greatly appreciated. > >> > >> > >> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > >> 6128 root 20 0 10.5g 2.3g 14m S 539.2 19.5 6:16.95 java > >> -server -XX:+HeapDumpOnOutOfMemoryError -Xms2048m -Xmx2048m > >> -XX:NewSize=128m -XX:MaxNewSize=128m -XX:MaxTenuringThreshold=2 > >> -Dsun.rmi.dgc.client.gcInterval=6 > >> > >> > >> > >> Thanks, > >> Jacky > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: [email protected] > >> For additional commands, e-mail: [email protected] > >> > >> > > > > > > -- > > Cordialement. > > Philippe Mouawad. > > > > > -- > Namaskara~Nalama~Guten Tag~Bonjour > > > -- > Keigu > > Deepak > +91-9765089593 > [email protected] > http://www.simtree.net > > Skype: thumsupdeicool > Google talk: deicool > Blog: http://loveandfearless.wordpress.com > Facebook: http://www.facebook.com/deicool > > "Contribute to the world, environment and more : > http://www.gridrepublic.org > " > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
