upstream-uber-go-guide/src/channel-size.md

Channel Size is One or None

Channels should usually have a size of one or be unbuffered. By default, channels are unbuffered and have a size of zero. Any other size must be subject to a high level of scrutiny. Consider how the size is determined, what prevents the channel from filling up under load and blocking writers, and what happens when this occurs.

Bad	Good
// Ought to be enough for anybody! c := make(chan int, 64)	// Size of one c := make(chan int, 1) // or // Unbuffered channel, size of zero c := make(chan int)