Automatic calculation optimizes the number of virtual users per process depending on the total number of virtual users. The following rules apply : 1) A minimum of 10 processes need to be achieved 2) Minimize the number of processes at a maximum of 50 virtual users per process 3 A runtime process can only hold the virtual users of one particular user type (usergroup + profile) So if for example you were running a 35 user test it will result in : Virtual Users | Process | V"Users per process 15 | 5 | 3 20 | 5 | 4 35 | 10 Rule 1 applies here = processes must be a minimum of 10 The only time the processes can be below 10 is when you are running less than 10 virtual users (i.e 3 vUsers will use 3 processes) There is no actual formula used to calculate this, this is formulated using experience and conducting tests. It usually guarantees the best ratio of resource consumption vs performance. The maximum number of virtual users per process is 50, after this has been reached a new process is created.
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