Created
July 12, 2019 14:17
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Medium - Channel - Buffer Size Benchmark
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package bench | |
import ( | |
"sync" | |
"sync/atomic" | |
"testing" | |
) | |
func BenchmarkWithNoBuffer(b *testing.B) { | |
benchmarkWithBuffer(b, 0) | |
} | |
func BenchmarkWithBufferSizeOf1(b *testing.B) { | |
benchmarkWithBuffer(b, 1) | |
} | |
func BenchmarkWithBufferSizeEqualsToNumberOfWorker(b *testing.B) { | |
benchmarkWithBuffer(b, 5) | |
} | |
func BenchmarkWithBufferSizeExceedsNumberOfWorker(b *testing.B) { | |
benchmarkWithBuffer(b, 25) | |
} | |
func benchmarkWithBuffer(b *testing.B, size int) { | |
for i := 0; i < b.N; i++ { | |
c := make(chan uint32, size) | |
var wg sync.WaitGroup | |
wg.Add(1) | |
go func() { | |
defer wg.Done() | |
for i := uint32(0); i < 1000; i++ { | |
c <- i%2 | |
} | |
close(c) | |
}() | |
var total uint32 | |
for w := 0; w < 5; w++ { | |
wg.Add(1) | |
go func() { | |
defer wg.Done() | |
for { | |
v, ok := <-c | |
if !ok { | |
break | |
} | |
atomic.AddUint32(&total, v) | |
} | |
}() | |
} | |
wg.Wait() | |
} | |
} |
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