[RFC]: Overlapped I/O implementation

Dan Kegel dank at kegel.com
Tue Nov 13 19:17:25 CST 2001

Martin Wilck wrote:
> > I don't think we want to use threads at all. This has major overhead
> > and compatibility problems. IMO normal file I/O should always be done
> > synchronously; it may impact performance a bit when reading from
> > floppy, but this is better than slowing down all async operations with
> > the need to manage threads and locks.
> OK, let's forget about this in the first place. I thought that clone()
> calls actually have pretty low overhead, but I may be mistaken (and too
> Linux-centric). And I did not think through all necessary synchonization
> needs.

You may want to consider using Posix aio to implement
overlapped I/O, regardless of whether it's a disk file,
a network connection, or whatever.  glibc has a fallback
implementation of aio, and vendors are starting to provide
optimized, high-quality implementations.  SGI and Red Hat
are working hard on it.  

For more info, see http://www.kegel.com/c10k.html#aio

And then there are completion ports... more on that later.
- Dan

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