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[Adam D. Ruppe]

On Thursday, 4 June 2020 at 01:38:50 UTC, Walter Bright wrote:
> Furthermore, stdout has to acquire a mutex before writing to it:

No need for any of this on the OS level, a write up to like 4k is 
guaranteed to be atomic.

It is the C buffer that isn't :(

And the C buffer is a consistent source of pain for 
user-interactive i/o. Buffering makes a big performance 
difference when you are actually outputting a block... but with 
user-interactive you rarely actually *want* buffering since users 
want to see their results ASAP! And remember, pipes are 
frequently user-interactive too and them not being flushed 
frequently is a FAQ among new users, especially IDE users.

I kinda feel buffering should not be done across function 
boundaries for stdout and stderr. Other files maybe.