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ru.linux
- RU.LINUX ---------------------------------------------------------------------
From : Oleg Drokin 2:5020/400 26 Apr 2003 14:16:10
To : Alex Korchmar
Subject : Re: дисковые буферы
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Hello!
Alex Korchmar <alx@e-moe.ru> wrote:
OD>> Соответственно man 2 open на предмет O_DIRECT
AK> % env PAGER=more man 2 open | grep 'O.*_.*D.*I.*R.*E'
AK> O_DIRECTORY
AK> not, in fact, a directory, or O_DIRECTORY was
AK> %
AK> Я что-то не так делаю?
Старые маны? ;)
O_DIRECT
Try to minimize cache effects of the I/O to and from this file.
In general this will degrade perforЅ
mance, but it is useful in special situations, such as when
applications do their own caching. File I/O
is done directly to/from user space buffers. The I/O is
synchronous, i.e., at the completion of the
read(2) or write(2) system call, data is guaranteed to have been
transferred. Transfer sizes, and the
alignment of user buffer and file offset must all be multiples
of the logical block size of the file
system.
This flag is supported on a number of Unix-like systems; support
was added under Linux in kernel version
2.4.10.
A semantically similar interface for block devices is described in
raw(8).
> rpm -qa | grep man-pa
man-pages-1.56-6
Bye,
Oleg
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