> But, I am not getting a good doc about constant throughput timer.
> I tried net, but no luck.

http://jakarta.apache.org/jmeter/usermanual/component_reference.html#Constant_Throughput_Timer

This URL is in basically every thread on this list!

> I see that there are 2 fields.
> #1 target throughput(in samples per minute) - so I need 100 threads per
> minute, I should use 100X60 RIGHT? 

For 100 per SECOND - right.

> #2 Calculate throughput based on - so I need to give "calculate throughput
> based on all threads in this threadgroup.RIGHT?

Depends. If you have only one thread group with one task all the threads
are performing, it won't matter much.

> Then I'll get 100X60 every minute...right?
> Also, does it uniformly distribute the load every second?
> Or does it only guarantee that it'll run 100X60 per minute?

It distributes quite evenly.

> I don't think it'll be uniform.
> So, giving a ramp up period doesn't mean that we'll get the threads
> divided
> by the ramp up period.
> It only guarantees that all the threads will be ready by the end of
> the ramp
> up period.

Experience has shown otherwise. The rampup is quite even, try longer
ramp up times. The start time distribution is even, baring artifacts
such as intermittent garbace collector runs.

Cheers
Felix

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