stdio performance in tango, stdlib, and perl

[Dave]

Walter Bright Wrote:

> Andrei Alexandrescu (See Website For Email) wrote:
> > Walter Bright wrote:
> >> Turning off sync is cheating - D's readln does syncing.
> > 
> > I don't know exactly what sync'ing does in C++, but probably it isn't 
> > the locking that you are thinking of.
> 
> I think it means bringing the iostream I/O buffer in to sync with the 
> stdio I/O buffer, i.e. you can mix printf and iostream output and it 
> will appear in the same order the calls happen in the code.
> 

That's exactly what it does... Quite a few times I've had to 'optimize' C++ iostream code using sync_with_stdio().

> D's readln is inherently synced in this manner.

Which of course begs the question -- Could an overload be added so it doesn't sync (not the default)? Might be worth a test, and if the difference is significant keep it.