Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait

Marcelo Tosatti
2001-02-08T16:36:44Z

On Thu, 8 Feb 2001, Mikulas Patocka wrote:

> > > The problem is that aio_read and aio_write are pretty useless for ftp or
> > > http server. You need aio_open.
> >
> > Could you explain this?
>
> If the server is sending many small files, disk spends huge amount time
> walking directory tree and seeking to inodes. Maybe opening the file is
> even slower than reading it - read is usually sequential but open needs to
> seek at few areas of disk.
>
> And if you have one-threaded server using open, close, aio_read and
> aio_write, you actually block the whole server while it is opening a
> single file. This is not how async io is supposed to work.

Ok but this is not the point of the discussion.