Performance Center unable to ramp up beyond 25 Truclient users
Question ID: 108932

We are currently using Performance Center 12.55 and Windows 2012 Server R2.
In our scenario, we ramp up over 200 Vusers slowly and the agent is set up to run as a process. When ramping up significantly beyond 200 TruClient Vusers on one Load Generator, even if the generator's resources are within reasonable ranges, will cause users to timeout when ramping up. This comes back as an IBS: Connection to browser lost error. Any help or input would be great.

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Posted by (Questions: 108, Answers: 6)
Asked on April 17, 2019 11:59 am
Answers (1)
Private answer

When running many TruClient Vusers as a process on one Load Generator, your receiving the repeated error: '' IPC connection to browser process is lost '' due to the Windows GDI limitation.

GDI objects represent graphical device interface resources like, fonts, bitmaps, brushes, etc. As with CPU and Memory, each browser consumes different GDI objects depending on the page(s) it displays.

In the Windows Operating System, there is a known limitation on the amount of GDI objects that can be created in a session. The theoretical limit is 65,536 GDI objects per session. However, the maximum number of GDI objects that can be created per session is usually much lower.

Therefore, when running large amount of Virtual Users, you might encounter a GDI object limitation while not reaching high CPU or Memory utilization.

Reaching GDI objects limitation results in Vuser errors; such as, ''IPC connection to the browser is lost'' or ''Failed to create IPC connection to the browser'', in your Controller output messages.

To overcome Windows GDI limitation, one can use Performance Center with terminal sessions integration or distribute the Vuser load across many load generators.


I recommend distributing the Vuser load across many load generators.

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Posted by (Questions: 17, Answers: 266)
Answered on April 19, 2019 7:38 pm

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