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Loadrunner Hardware Architecture
Let me explain the scene that i have over here.
We are using the following architecture for load testing a particular application.
Controller machine is separate.
A farm of load generators acting as virtual users.
Now there is another controller machine.
We plan to load test another application from the new controller but using the existing farm of load generators.
Now the quesiton is in this scene, obvisously the performance would be hit coz the load generators are going to be the same, but by what amount.
I mean can i get an pointer from someone as to what parameters might get affected or something specific to look / monitor in this case.
In the first place is it feasible that both the load test take place simultaneously using the same load generators?
Re: Loadrunner Hardware Architecture
At one site that I work at, we have six quad-xeon processor based Load Generators, each with 4 Gig of ram, each of which can easily run 3,000 web VUsers.
If we are running multiple large tests concurrently, rather than share load generators, we tend to allocate whole Generators to a particular test. This is useful so that prior to a really long soak test, we can re-boot the generator PC, clean up old (large) files and perform any other house keeping duties without impacting (or co-ordinating with) any other test.
Also, when a substantial test completes, log files are transferred from the Generators back to the controller. This activity is very intensive, and may impact the capacity of the Load Generator much more than normal test execution.
Regarding you question about impact on Load Generators, it is good practice to always monitor the activity of each load generator, to make sure that it is not working too hard and thus possibly generating inadequate load.