can anybody tell me how to use timers(guassian timers,constant timers ...so many so which one is for what type of testing) for load testing .i have tried it but there has been no use of it
if any one could explain it in detail plz
The timers should be used depending on what kind of situation you are trying to simulate:
Gaussian - this essentially creates a random timer where most of the time intervals are 'clustered' near a specific point. For example, if you set the delay of 500ms and a deviation of 100ms, the majority of the time intervals will be closer too 500ms, but you will still have the occaional random interval that is further away. You would use this if you had a scenario where you were confident that the interval 90% of the time would be very near 500ms, but you still wanted an element of chaos in the timings.
Uniform Random - just a random interval, no bias applied to the timings so you should get an even spread across your range of timings.
Constant Throughput - inserts timings to insure a constand rate of throughput. So if you were more interested in getting stats when your system is running at a throughput of 100/sec then jmeter will use the intervals to insure that your throughput does not exceed that.
Synchronising - just blocks all threads untill you hit a number. For example if you wanted to check your application for flooding, yoou set a number of users and jmeter builds up all the threads and then releases them all at once.
hope this helps, most of the info should be available on the JMeter help page.
Thank you rmh for ur reply
out of all these can u go bit in detail about synchronising timers i have tried other timers nd they are working so got struck with sync...timers ...plz if u could explain with scenario ie testplan (where to place this sync timers ...........is it at thread group or workbench)