How Many Users Can Be Emulated by WAPT Pro?


An estimated number of simultaneously acting virtual users emulated by each Load Agent for the following hardware configuration: Intel Pentium IV 2.4 GHz PC, 1 GB RAM should stand at about 2000. If you install Load Agents on several computers and perform a distributed test run, then the overall number of simultaneously acting virtual users can be calculated as 2000*N (2000 multiplied by N), where N is the number of Load Agents participating in the test. Note that you should use either Windows Server 2003/2008/2012, or Windows XP/Vista/7/8/10 operating systems.

The number of emulated users depends most of all on the typical time between requests for the tested system. If response time is very short, the number of simulated users should be less than 1000. If the response time or time between requests is rather long, the number of users can be more. Actually, you will be able to emulate up to 2000 simultaneously acting users on each computer with the Load Agent.

Also note that each virtual user consumes RAM (Random-Access Memory). Usually the maximum size of response is about 100 KB for each user. Additionally RAM is used for test run results - each user consumes about 100 KB for test results. About 100 KB of memory are required for virtual user's work.

100 KB (size of maximum response) + 100 KB (test results) + 100 KB (virtual user working set memory) = 300 KB

So you will need about 300 KB of RAM to simulate a single user, and about 300 MB of RAM for 1000 virtual users.

To know the amount of available memory on a computer, see Windows Task Manager -> Performance -> Physical Memory -> Available.

Additional information regarding hardware bottlenecks:

Network bandwidth
Note that even 500 "quick" virtual users could reach 100 Mb network bandwidth limit.
Processor
If you simulate "quick" and/or "complicated" virtual users, then your processor should meet high requirements.

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