benchmark-task-switch.jl

using BenchmarkTools

function bench_async_yield(N, T)
    ts = [@async begin
        for i in 1:N
            yield()
        end
    end for _ in 1:T]
    wait.(ts)
end
function bench_spawn_yield(N, T)
    ts = [Threads.@spawn begin
        for i in 1:N
            yield()
        end
    end for _ in 1:T]
    wait.(ts)
end

function bench_async_create_finish(N)
    ts = [@async begin
          end for _ in 1:N]
    wait.(ts)
end
function bench_spawn_create_finish(N)
    ts = [Threads.@spawn begin
          end for _ in 1:N]
    wait.(ts)
end

# 1 thread
# Task hooks:
# 36.6 ms
# Master:
# 35.5 ms
display(@benchmark bench_async_yield(10_000, 8))

# 3 threads
# Task hooks:
# 30.33 ms
# Master:
# 32.71 ms
display(@benchmark bench_spawn_yield(10_000, 8))

# 1 thread
# Task hooks:
# 3.47 ms
# Master:
# 3.71 ms
display(@benchmark bench_async_create_finish(10_000))

# 3 threads
# Task hooks:
# 4.05 ms
# Master:
# 3.85 ms
display(@benchmark bench_spawn_create_finish(10_000))