lkml.org 
[lkml]   [2001]   [Feb]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait
> > 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.

Mikulas


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:08    [W:0.110 / U:17.124 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site