Adding steal-half functionalities to work-requesting scheduler

[hkaiser]

• adding new scheduler: --hpx:queuing=local-workrequesting-mc that relies on the Moody-Camel queue
• flyby: a lot of cleanup in various related places
• flyby: fixing config-registry for command line module

working towards #4703

[hkaiser]

A couple of local performance numbers (future_overhead_test):

• default scheuler

invoked 500000, futures  create_thread_hierarchical           latch               none in 0.292718 seconds : 0.585436 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures                       apply   limiting-Exec  parallel_executor in 0.347093 seconds : 0.694186 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures                      action        WaitEach        no-executor in 5.070678 seconds : 10.141356 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures                      action         WaitAll        no-executor in 4.601552 seconds : 9.203105 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures                       async        WaitEach  parallel_executor in 4.246172 seconds : 8.492345 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures                       async         WaitAll  parallel_executor in 3.786355 seconds : 7.572709 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures                       apply     Sliding-Sem  parallel_executor in 4.295582 seconds : 8.591163 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures                    for_loop             par  parallel_executor in 0.000702 seconds : 0.001404 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures                    for_loop             par scheduler_executor<thread_pool_scheduler> in 0.000669 seconds : 0.001338 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures                    for_loop             par parallel_executor_nostack in 0.000535 seconds : 0.001070 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures               register_work           latch               none in 1.136111 seconds : 2.272222 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures               create_thread           latch               none in 1.328317 seconds : 2.656634 us/future, queue              default, numa    0, threads   20, info              no-info
invoked 500000, futures          apply_hierarchical           latch  parallel_executor in 0.197347 seconds : 0.394695 us/future, queue              default, numa    0, threads   20, info              no-info

• workrequesting scheduler (fifo)

invoked 500000, futures  create_thread_hierarchical           latch               none in 0.305966 seconds : 0.611931 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures                       apply   limiting-Exec  parallel_executor in 0.362330 seconds : 0.724661 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures                      action        WaitEach        no-executor in 2.789453 seconds : 5.578905 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures                      action         WaitAll        no-executor in 2.409016 seconds : 4.818032 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures                       async        WaitEach  parallel_executor in 2.085483 seconds : 4.170967 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures                       async         WaitAll  parallel_executor in 1.715133 seconds : 3.430267 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures                       apply     Sliding-Sem  parallel_executor in 3.787963 seconds : 7.575926 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures                    for_loop             par  parallel_executor in 0.000492 seconds : 0.000984 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures                    for_loop             par scheduler_executor<thread_pool_scheduler> in 0.000534 seconds : 0.001067 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures                    for_loop             par parallel_executor_nostack in 0.000469 seconds : 0.000937 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures               register_work           latch               none in 1.046038 seconds : 2.092075 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures               create_thread           latch               none in 1.003888 seconds : 2.007775 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info
invoked 500000, futures          apply_hierarchical           latch  parallel_executor in 0.250559 seconds : 0.501117 us/future, queue local-workrequesting-fifo, numa    0, threads   20, info              no-info

• workrequesting scheduler (steal-half, moody-camel)

invoked 500000, futures  create_thread_hierarchical           latch               none in 0.302476 seconds : 0.604953 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures                       apply   limiting-Exec  parallel_executor in 0.324260 seconds : 0.648520 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures                      action        WaitEach        no-executor in 2.712715 seconds : 5.425430 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures                      action         WaitAll        no-executor in 2.324837 seconds : 4.649675 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures                       async        WaitEach  parallel_executor in 1.933456 seconds : 3.866911 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures                       async         WaitAll  parallel_executor in 1.540370 seconds : 3.080739 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures                       apply     Sliding-Sem  parallel_executor in 3.630330 seconds : 7.260659 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures                    for_loop             par  parallel_executor in 0.000528 seconds : 0.001056 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures                    for_loop             par scheduler_executor<thread_pool_scheduler> in 0.000551 seconds : 0.001101 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures                    for_loop             par parallel_executor_nostack in 0.000442 seconds : 0.000884 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures               register_work           latch               none in 1.049016 seconds : 2.098031 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures               create_thread           latch               none in 1.010455 seconds : 2.020909 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info
invoked 500000, futures          apply_hierarchical           latch  parallel_executor in 0.179287 seconds : 0.358574 us/future, queue local-workrequesting-mc, numa    0, threads   20, info              no-info

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.07%	✅ 71.43%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (c0d79c8)	201862	171892	85.15%
Head commit (76f2baf)	191893 (-9969)	163271 (-8621)	85.08% (-0.07%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6422)	553	395	71.43%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[hkaiser]

The failures seem to be unrelated, and the changes do not affect existing code (hopefully)... Merging now.