Benchmarks

To better understand the performance characteristics of Rill, a series of benchmarks were performed on a MacBook Pro M2 Max. Each benchmark is performed against a channel of 100k integers, at different levels of concurrency (1,2,4,8), and with varying amounts of work per iteration:

• A busy loop was used to simulate a CPU-bound workload
• time.Sleep was used to simulate an I/O-bound workload

Additionally, there are two benchmarks that serve as baselines:

• ErrGroup + SetLimit, where a new goroutine is spawned for each channel item
• ErrGroup with fixed number of goroutines (worker pool)

Method	Conc.	1μs busy loop	10μs busy loop	1μs sleep	10μs sleep	Allocs/op	B/op
ErrGroupWithSetLimit	1	218531833 ns/op	1146390499 ns/op	481882764 ns/op	1569552834 ns/op	200001	5600136
ErrGroupWithSetLimit	2	124182653 ns/op	590644854 ns/op	293238573 ns/op	766368792 ns/op	200007	5602990
ErrGroupWithSetLimit	4	116164097 ns/op	347600042 ns/op	134030745 ns/op	394443472 ns/op	200010	5605173
ErrGroupWithSetLimit	8	116755486 ns/op	251444742 ns/op	76061694 ns/op	218647817 ns/op	200000	5600053
ErrGroupWithWorkerPool	1	157628440 ns/op	1070065542 ns/op	389682959 ns/op	1505031126 ns/op	0	41
ErrGroupWithWorkerPool	2	98502243 ns/op	645473250 ns/op	240243217 ns/op	740995583 ns/op	0	32
ErrGroupWithWorkerPool	4	70661732 ns/op	369048014 ns/op	135748313 ns/op	368215347 ns/op	0	24
ErrGroupWithWorkerPool	8	85432523 ns/op	275167875 ns/op	70875400 ns/op	186602958 ns/op	0	29
ForEach	1	159580077 ns/op	1072244042 ns/op	392763861 ns/op	1489722917 ns/op	0	68
ForEach	2	99347489 ns/op	644313146 ns/op	240087758 ns/op	741440334 ns/op	0	80
ForEach	4	71316752 ns/op	364494652 ns/op	134345094 ns/op	369602903 ns/op	0	64
ForEach	8	84495190 ns/op	276267854 ns/op	68944641 ns/op	186505736 ns/op	0	29
MapAndDrain	1	156800661 ns/op	1091518834 ns/op	415814028 ns/op	1500481500 ns/op	0	27
MapAndDrain	2	117838088 ns/op	659681292 ns/op	256209625 ns/op	743612938 ns/op	0	32
MapAndDrain	4	96687226 ns/op	384215639 ns/op	136647854 ns/op	370182875 ns/op	0	32
MapAndDrain	8	87198372 ns/op	334040458 ns/op	79791104 ns/op	187653424 ns/op	0	34
Reduce	1	159801369 ns/op	1070754041 ns/op	394507583 ns/op	1505162625 ns/op	0	27
Reduce	2	99016781 ns/op	641583958 ns/op	243294933 ns/op	738433208 ns/op	0	64
Reduce	4	71186005 ns/op	363286431 ns/op	135991266 ns/op	370837847 ns/op	0	12
Reduce	8	87029161 ns/op	275286636 ns/op	69897620 ns/op	187040451 ns/op	0	16