Subject: Re: yamt-readahead branch
To: Chuck Silvers <>
From: SODA Noriyuki <>
List: tech-kern
Date: 11/17/2005 16:16:48
>>>>> On Wed, 16 Nov 2005 23:10:41 -0800, Chuck Silvers <> said:

> I think the next most common case is that multiple threads read the
> file using the same file descriptor.  for this, per-struct-file
> state doesn't help.  the case where multiple threads read the file
> simultaneously using separate file descriptors seems relatively
> rare.

Hmm, really?
I think the latter is more frequent in http servers and usual unix
applications than the former.

What the common case for the former case?
I guess database access is nearly random, and readahead doesn't help
(or maybe make performance worse even) for the database case.