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In custom load, you can set the load to be applied by entering how many VUs you would like to run for a particular duration. Each interval has the format {number of VUs}:{duration (s)}. Example: 100:90;150:60 means start with 100 VUs for 90 seconds, then continue with 150 VUs for 60 seconds.


Alternatively, you can use the Custom Load Pattern Editor to interactively set your load.

If you have a large number of intervals, you can copy and paste a VUs / Duration table from Excel.



After the first interval if the number of VUs is increased, the original set of VUs is kept and additional VUs are added. If the number of VUs is decreased, the VUs added last are put to sleep. If the number of VUs increases once again, the sleeping VUs begin running again.

By default the change in VUs occurs immediately when the duration of an interval ends. If you would like to extend the duration until all VUs complete their iteration, check Wait for users to complete Iteration?

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