Ramp up

[chentex]

Description

Adding ramp up functionality to the suite.

Each individual test can be provided with the following parameters:

• duration: in minutes
• ramp-type: can be exponential or linear
• start-rate: as in req per second
• end-rate: as in req per second
• ramp-steps: Number of steps to reach the desired end-rate

The test will run # with a running time of / rounded, as each step finishes it will increase the rate according to a delta that is calculated with the parameters:

For a linear ramp it will use this formula

delta = ( end-rate - start-rate ) / ( steps - 1 )

steps, has always have to be greater than 1

So the new rate will be:

newRate = oldRate + delta

For an exponential distribution:

We are using the exponential formula f(t)=start-rate * <coeff> ^ t

the coeff is calculated with this formula

coeff = (end-rate / start-rate) ^ (1 / steps)

So the new rate will be:

newRate = start-rate * coeff ^ <# of step>

Tasks

• [x] Linear ramp
• [x] Exponential ramp
• [x] Implement usage
• [x] Implement flag options
• [x] Documentation
• [x] Automation tasks
  • [x] Cumulative Avg over time graph
  • [x] Request count over time graph

[dry923]

@chentex Not sure if this functionality is in there (still walking through the code) but can it/it might be useful if it could have a ramp up time and a test time. So it can ramp up for 30 minutes but the entire test will run for 60.

[chentex]

So @dry923 if I get you right you wan t something like this:

• Endpoint A:
  • duration: 60 min
  • ramp duration: 30 min

And this will run a normal test with a normal rate or the start-rate for 30 min and then ramp up for 30 min, that it's the remaining of the duration.

[troy0820]

LGTM but can we squash these commits? NICE Work @chentex !!!! 🎉