Just some tricks to help performance on large tests: 1. Run non-gui. It makes a big difference. 2. Edit the jmeter.bat/jmeter startup script and remove the -Xincg option. JMeter runs tremendously faster with the standard garbage collector as I've recently discovered. Yes, there will be GC pauses that ruin some data points here and there, but if you are doing a large scale test, the improved performance will be dramatic, and you are probably looking at the results from a high vantage anyway. A small test is the only kind that can benefit from - Xincg.
3. Save memory by reducing the number of test elements in your test plan. If you recorded a test and have 1000 HTTP Samplers with 1000 Header Managers all with the same stuff, then remove the header managers (unless your app needs them, in which case, find out what it needs and include 1 header manager that affects all the samplers). Using looping constructs to remove duplicate requests and consider skipping static requests of all sorts (image files, javascript, etc). If you feel they are necessary, then set up a single request that gets its path value from a file (using StringFromFile) and loop it, interleave it or whatever to get the desired amount of static requests in your tests. Every test element is duplicated for every thread you run, so if you are running 100 threads, those 2000 test elements become 200000 objects in memory. It's like programming, remove all duplication. By doing these things, I can run 60 threads with a very large and sophisticated test plan and my cpu usage is rarely over 5%. Memory, of course, is through the roof, but I set it high enough (512m) and JMeter runs all night long. -Mike On 23 Sep 2003 at 16:58, Jean-Sebastien Morisset wrote: > Hi, > > I've been trying to get jmeter up and running, but I keep running into > some serious performance limits. If I run ab on my smallest machine, I > can easily run 1000 concurrent requests and get 580 requests/sec. When > using jmeter-server, I have problems going over 2-3 threads and my max > is 65 requests/second! Is this normal? > > Thanks, > js. > -- > Jean-Sebastien Morisset, Sr. UNIX Administrator <[EMAIL PROTECTED]> > Personal Home Page <http://jsmoriss.mvlan.net/> > JS & Melanie's Homebrewery <http://brewery.mvlan.net/> > Underwater and Travel Photographs <http://www.mvpix.com/> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > -- Michael Stover [EMAIL PROTECTED] Yahoo IM: mstover_ya ICQ: 152975688 AIM: mstover777 --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
