>>>> Selenium Grid has a limitation where the number of parallel tests is tied to the number of processors on the hub.
I would be really curious to learn how did you conclude on this? Can you please help share with us, on some background behind this analysis?
AFAIK, the number of processors has got nothing to do with the Grid’s max value in terms of parallel tests. The number of processors is usually a factor that folks who work on Java consider, before deducing the maximum number of threads they should be spinning off, when doing concurrent programming.
But that theory is not applicable here when it comes to the Hub, because the Hub is merely playing the role of a postman+matcher, forwarding actions to the nodes and matching new session requests to the nodes. It’s the nodes that are actually doing all the heavy lifting.
All said and done, the Node can be tweaked to control the number of concurrent sessions that can run at the same time. See here https://rationaleemotions.github.io/gridopadesham/NODE_CONFIG.html#maxsession
To get an overview and the set of customizations that are possible with the Grid, you can refer to my book/tutorial: https://rationaleemotions.github.io/gridopadesham/
Thanks & Regards
Krishnan Mahadevan
"All the desirable things in life are either illegal, expensive, fattening or in love with someone else!"
My Scribblings @ http://wakened-cognition.blogspot.com/
My Technical Scribbings @ http://rationaleemotions.wordpress.com/
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>>>> However, I do want to know if I can for example, say run my tests on 50 machines triggering from a single hub and (only one session on each) by selecting the tests from Text Explorer. Is this possible?
If you have 50 nodes attached to your hub and if you have configured maxSession per node as 1, then yes, you should be able to do this. Grid doesn’t deal with triggering your tests in parallel. So make sure whatever testrunner you are using, can kick off 50 tests concurrently.
To view this discussion on the web visit https://groups.google.com/d/msgid/selenium-users/b5640257-15af-4e75-852c-c1de5e2b044a%40googlegroups.com.