Is there a "best practice" configuration for running tests with Gradle in parallel?

[jc]

I've been running tests in parallel with Gradle with no issues using the maxParallelForks option with Chrome on Jenkins. However today I started trying it with Firefox and I'm not getting great results. Towards the end of the execution the tests become extremely slow but they don't time out for a long time. Sometimes I'll get a WebDriverException with no message and the rest of the tests in the class fail.

I've been trying to troubleshoot and haven't really found a good solution yet. The grid is a network of Windows VMs and the RAM seems to be hitting 95+% so I'm not sure if Firefox has a memory leak. After reading through the Book of Geb, I tried setting cacheDriverPerThread to true but that did not seem to help.

I'm just wondering if anyone has experienced this or if there is a best practice for settings to use when running tests in parallel. I'd be interested to hear what others are doing or if Marcin has any advice.

Thanks!

[Marcin Erdmann]

If you're observing memory leaks or memory pressure in your tests, a quick fix would be to restart the test JVM (and also the browser because the browser is shut down by Geb when the test JVM shuts down) every N test classes - see https://docs.gradle.org/current/dsl/org.gradle.api.tasks.testing.Test.html#org.gradle.api.tasks.testing.Test:forkEvery. The only thing is figuring out what the value of N should be - too low and it will slow down the test execution due to constant JVM restarts and too high and you will be hitting the original problem you had.

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[jc]

Ah, so that's what forkEvery actually does.  For some reason I thought it defaulted to 1 but it actually defaults to 0.  Changing it to 1 seemed to help.  Thanks!

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[GebUser]

jc,

were you getting DriverCreationException?

[jc]

I think I was getting some, yes.

[GebUser]

jc,

You are no longer seeing DriverCreationException after you have updated forkEvery to 1?

I also wanted to try this out. When I am running 1000s of geb tests in firefox with 4 firefox browsers in parallel, I frequently get "DriverCreationException - connection refused" error. 

Marcin,

Curious if this forkEvery setting might help prevent DriverCreationException. 

Thanks,