[REFERENCE] Backport thread scheduling #710

Job	Run time
omnibus compilations, trigger	3s
omnibus compilations, #9	27m 26s
omnibus compilations, #5	23m 6s
omnibus compilations, #4	26m 14s
omnibus compilations, #7	34m 49s
omnibus compilations, #6	28m 29s
omnibus compilations, #3	34m 41s
omnibus compilations, #10	28m 14s
omnibus compilations, #11	25m 17s
omnibus compilations, #8	29m 0s
omnibus compilations, #2	33m 17s
omnibus compilations, #1	29m 11s
omnibus compilations, #12	14m 54s
omnibus compilations, result	3s
	5h 34m 44s

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