Use of parallel in Jenkinsfile causes deadlock on Jenkins

[jonahgraham]

We are using parallel to run tests + code cleanliness in parallel. But this is causing deadlock on the build machine.

cdt/Jenkinsfile

Line 9 in 2089c1d

parallel {

The reason is that the outer agent request:

cdt/Jenkinsfile

Line 2 in 2089c1d

agent any

allocates an executor, and then that executor tries to allocate 2 additional executors to do the two in parallel parts. However if multiple builds allocate the executor requested at Line 2, then the Eclipse CDT project runs out of executors and all of them are waiting.

[jonahgraham]

#56 turns off the parallel. I have had to kill all jobs on Jenkins to unblock everything. Once I merge #56 the active PRs will all be rebuilt merged to the current head so that should resolve the issue without needing contributors to rebase.

[jonahgraham]

See Helpdesk: Eclipse CDT CI instance has no resources?

[jonahgraham]

Deadlock issues resolved. If/when someone tries to revisit this hopefully they will know more that I did and enable the parallel in a way that can't deadlock. Alternative really is just use github actions.