I am comparing the performance regarding sync.Mutex and Go channels. Here is my benchmark: https://play.golang.org/p/zLjVtsSx9gd
The performance comparison visualization is as follows: [image: sync.Mutex performance (1).png] What are the reasons that 1. sync.Mutex encounter a large performance drop when the number of goroutines goes higher than roughly 3400? 2. Go channels are pretty stable but slower than sync.Mutex before? Raw bench data by benchstat (go test -bench=. -count=5): MutexWrite/goroutines-2400-8 48.6ns ± 1% MutexWrite/goroutines-2480-8 49.1ns ± 0% MutexWrite/goroutines-2560-8 49.7ns ± 1% MutexWrite/goroutines-2640-8 50.5ns ± 3% MutexWrite/goroutines-2720-8 50.9ns ± 2% MutexWrite/goroutines-2800-8 51.8ns ± 3% MutexWrite/goroutines-2880-8 52.5ns ± 2% MutexWrite/goroutines-2960-8 54.1ns ± 4% MutexWrite/goroutines-3040-8 54.5ns ± 2% MutexWrite/goroutines-3120-8 56.1ns ± 3% MutexWrite/goroutines-3200-8 63.2ns ± 5% MutexWrite/goroutines-3280-8 77.5ns ± 6% MutexWrite/goroutines-3360-8 141ns ± 6% MutexWrite/goroutines-3440-8 239ns ± 8% MutexWrite/goroutines-3520-8 248ns ± 3% MutexWrite/goroutines-3600-8 254ns ± 2% MutexWrite/goroutines-3680-8 256ns ± 1% MutexWrite/goroutines-3760-8 261ns ± 2% MutexWrite/goroutines-3840-8 266ns ± 3% MutexWrite/goroutines-3920-8 276ns ± 3% MutexWrite/goroutines-4000-8 278ns ± 3% MutexWrite/goroutines-4080-8 286ns ± 5% MutexWrite/goroutines-4160-8 293ns ± 4% MutexWrite/goroutines-4240-8 295ns ± 2% MutexWrite/goroutines-4320-8 280ns ± 8% MutexWrite/goroutines-4400-8 294ns ± 9% MutexWrite/goroutines-4480-8 285ns ±10% MutexWrite/goroutines-4560-8 290ns ± 8% MutexWrite/goroutines-4640-8 271ns ± 3% MutexWrite/goroutines-4720-8 271ns ± 4% ChanWrite/goroutines-2400-8 158ns ± 3% ChanWrite/goroutines-2480-8 159ns ± 2% ChanWrite/goroutines-2560-8 161ns ± 2% ChanWrite/goroutines-2640-8 161ns ± 1% ChanWrite/goroutines-2720-8 163ns ± 1% ChanWrite/goroutines-2800-8 166ns ± 3% ChanWrite/goroutines-2880-8 168ns ± 1% ChanWrite/goroutines-2960-8 176ns ± 4% ChanWrite/goroutines-3040-8 176ns ± 2% ChanWrite/goroutines-3120-8 180ns ± 1% ChanWrite/goroutines-3200-8 180ns ± 1% ChanWrite/goroutines-3280-8 181ns ± 2% ChanWrite/goroutines-3360-8 183ns ± 2% ChanWrite/goroutines-3440-8 188ns ± 3% ChanWrite/goroutines-3520-8 190ns ± 2% ChanWrite/goroutines-3600-8 193ns ± 2% ChanWrite/goroutines-3680-8 196ns ± 3% ChanWrite/goroutines-3760-8 199ns ± 2% ChanWrite/goroutines-3840-8 206ns ± 2% ChanWrite/goroutines-3920-8 209ns ± 2% ChanWrite/goroutines-4000-8 206ns ± 2% ChanWrite/goroutines-4080-8 209ns ± 2% ChanWrite/goroutines-4160-8 208ns ± 2% ChanWrite/goroutines-4240-8 209ns ± 3% ChanWrite/goroutines-4320-8 213ns ± 2% ChanWrite/goroutines-4400-8 209ns ± 2% ChanWrite/goroutines-4480-8 211ns ± 1% ChanWrite/goroutines-4560-8 213ns ± 2% ChanWrite/goroutines-4640-8 215ns ± 1% ChanWrite/goroutines-4720-8 218ns ± 3% -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/3275fb21-dfbd-411d-be42-683386e7ebe2%40googlegroups.com.
