On Thu, Apr 05, 2007 at 03:10:43PM -0500, Erik Jones wrote:
Nope. What we never tracked down was the factor of 10 drop in
database transactions, not disk transactions. The write volume was
most definitely due to the direct io setting -- writes are now being
done in terms of the
Hi,
A page may be double buffered in PG's buffer pool and in OS's buffer cache.
Other DBMS like DB2 and Oracle has provided Direct I/O option to eliminate
double buffering. I noticed there were discusses on the list. But
I can not find similar option in PG. Does PG support direct I/O now?
The
On Apr 5, 2007, at 12:09 PM, Xiaoning Ding wrote:
Hi,
A page may be double buffered in PG's buffer pool and in OS's
buffer cache.
Other DBMS like DB2 and Oracle has provided Direct I/O option to
eliminate
double buffering. I noticed there were discusses on the list. But
I can not find
Erik Jones wrote:
On Apr 5, 2007, at 12:09 PM, Xiaoning Ding wrote:
Hi,
A page may be double buffered in PG's buffer pool and in OS's buffer
cache.
Other DBMS like DB2 and Oracle has provided Direct I/O option to eliminate
double buffering. I noticed there were discusses on the list. But
I
Not to hijack this thread, but has anybody here tested the behavior of
PG on a file system with OS-level caching disabled via forcedirectio or
by using an inherently non-caching file system such as ocfs2?
I've been thinking about trying this setup to avoid double-caching now
that the 8.x series
On Apr 5, 2007, at 1:22 PM, Xiaoning Ding wrote:
Erik Jones wrote:
On Apr 5, 2007, at 12:09 PM, Xiaoning Ding wrote:
Hi,
A page may be double buffered in PG's buffer pool and in OS's
buffer cache.
Other DBMS like DB2 and Oracle has provided Direct I/O option to
eliminate
double
On 4/5/07, Erik Jones [EMAIL PROTECTED] wrote:
On Apr 5, 2007, at 1:22 PM, Xiaoning Ding wrote:
Erik Jones wrote:
On Apr 5, 2007, at 12:09 PM, Xiaoning Ding wrote:
Hi,
A page may be double buffered in PG's buffer pool and in OS's buffer cache.
Other DBMS like DB2 and Oracle has provided
On Apr 5, 2007, at 1:27 PM, Mark Lewis wrote:
On Thu, 2007-04-05 at 13:09 -0500, Erik Jones wrote:
On Apr 5, 2007, at 12:09 PM, Xiaoning Ding wrote:
Hi,
A page may be double buffered in PG's buffer pool and in OS's buffer
cache.
Other DBMS like DB2 and Oracle has provided Direct I/O option
...
[snipped for brevity]
...
Not to hijack this thread, but has anybody here tested the behavior
of
PG on a file system with OS-level caching disabled via forcedirectio
or
by using an inherently non-caching file system such as ocfs2?
I've been thinking about trying this setup
On Apr 5, 2007, at 2:56 PM, Mark Lewis wrote:
...
[snipped for brevity]
...
Not to hijack this thread, but has anybody here tested the behavior
of
PG on a file system with OS-level caching disabled via forcedirectio
or
by using an inherently non-caching file system such as ocfs2?
I've been
On Thu, 5 Apr 2007, Xiaoning Ding wrote:
To the best of my knowledge, Postgres itself does not have a direct IO
option (although it would be a good addition). So, in order to use direct
IO with postgres you'll need to consult your filesystem docs for how to
set the forcedirectio mount
Alex Deucher wrote:
On 4/5/07, Erik Jones [EMAIL PROTECTED] wrote:
On Apr 5, 2007, at 1:22 PM, Xiaoning Ding wrote:
Erik Jones wrote:
On Apr 5, 2007, at 12:09 PM, Xiaoning Ding wrote:
Hi,
A page may be double buffered in PG's buffer pool and in OS's buffer
cache.
Other DBMS like DB2 and
On 4/5/07, Xiaoning Ding [EMAIL PROTECTED] wrote:
Alex Deucher wrote:
On 4/5/07, Erik Jones [EMAIL PROTECTED] wrote:
On Apr 5, 2007, at 1:22 PM, Xiaoning Ding wrote:
Erik Jones wrote:
On Apr 5, 2007, at 12:09 PM, Xiaoning Ding wrote:
Hi,
A page may be double buffered in PG's buffer pool
On Apr 5, 2007, at 3:33 PM, [EMAIL PROTECTED] wrote:
On Thu, 5 Apr 2007, Xiaoning Ding wrote:
To the best of my knowledge, Postgres itself does not have a
direct IO
option (although it would be a good addition). So, in order to
use direct
IO with postgres you'll need to consult your
On Thu, 5 Apr 2007, Xiaoning Ding wrote:
Xiaoning
Looks like it. I just did a cursory search of the archives and it seems
that others have looked at this before so you'll probably want to start
there if your up to it.
Linux used to have (still does?) a RAW interface which might also
On Thu, 5 Apr 2007, Erik Jones wrote:
On Apr 5, 2007, at 3:33 PM, [EMAIL PROTECTED] wrote:
On Thu, 5 Apr 2007, Xiaoning Ding wrote:
To the best of my knowledge, Postgres itself does not have a direct IO
option (although it would be a good addition). So, in order to use
direct
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