On Sun, Oct 28, 2007 at 08:06:58PM +, Simon Riggs wrote:
On Sun, 2007-10-28 at 13:05 -0500, Kenneth Marshall wrote:
On Sun, Oct 28, 2007 at 05:27:38PM +, Simon Riggs wrote:
On Sat, 2007-10-27 at 15:15 -0500, Kenneth Marshall wrote:
Its features include a better and faster hash
On 4/6/08, Tom Lane [EMAIL PROTECTED] wrote:
So adopting the mixing changes would make it faster yet. What we need
to be certain of is that this doesn't expose us to poorer hashing.
We know that it is critical that all bits of the input affect all bits
of the hash fairly uniformly ---
On Sun, Apr 06, 2008 at 12:02:25PM -0400, Tom Lane wrote:
Kenneth Marshall [EMAIL PROTECTED] writes:
Okay, I will strip the VALGRIND paths. I did not see a real need for them
either.
I have a patch ready to commit (as soon as I fix the regression test
issues) that incorporates all the
Kenneth Marshall [EMAIL PROTECTED] writes:
Okay, I will strip the VALGRIND paths. I did not see a real need for them
either.
I have a patch ready to commit (as soon as I fix the regression test
issues) that incorporates all the word-wide-ness stuff. All you really
need to look at is the
On Sat, Apr 05, 2008 at 03:40:35PM -0400, Tom Lane wrote:
Simon Riggs [EMAIL PROTECTED] writes:
On Sun, 2007-10-28 at 13:05 -0500, Kenneth Marshall wrote:
The new hash function is roughly twice as fast as the old function in
terms of straight CPU time. It uses the same design as the current
On Sun, Mar 16, 2008 at 10:53:02PM -0400, Tom Lane wrote:
Kenneth Marshall [EMAIL PROTECTED] writes:
Dear PostgreSQL Developers,
This patch is a diff -c against the hashfunc.c from postgresql-8.3beta1.
It's pretty obvious that this patch hasn't even been tested on a
big-endian machine:
Kenneth Marshall [EMAIL PROTECTED] writes:
Dear PostgreSQL Developers,
This patch is a diff -c against the hashfunc.c from postgresql-8.3beta1.
It's pretty obvious that this patch hasn't even been tested on a
big-endian machine:
+ #ifndef WORS_BIGENDIAN
However, why do we need two code paths
On Sat, 2007-10-27 at 15:15 -0500, Kenneth Marshall wrote:
Its features include a better and faster hash function.
Looks very promising. Do you have any performance test results to show
it really is faster, when compiled into Postgres? Better probably needs
some definition also; in what way are
On Sun, Oct 28, 2007 at 05:27:38PM +, Simon Riggs wrote:
On Sat, 2007-10-27 at 15:15 -0500, Kenneth Marshall wrote:
Its features include a better and faster hash function.
Looks very promising. Do you have any performance test results to show
it really is faster, when compiled into
On Sun, 2007-10-28 at 13:05 -0500, Kenneth Marshall wrote:
On Sun, Oct 28, 2007 at 05:27:38PM +, Simon Riggs wrote:
On Sat, 2007-10-27 at 15:15 -0500, Kenneth Marshall wrote:
Its features include a better and faster hash function.
Looks very promising. Do you have any performance
PROTECTED]
Sent: Sunday, October 28, 2007 04:11 PM Eastern Standard Time
To: Kenneth Marshall
Cc: pgsql-patches@postgresql.org; [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject:Re: [PATCHES] updated hash functions for postgresql v1
On Sun, 2007-10-28 at 13:05 -0500, Kenneth Marshall
On Sun, 2007-10-28 at 13:19 -0700, CK Tan wrote:
Hi, this query on TPCH 1G data gets about 5% improvement.
select count (*) from (select l_orderkey, l_partkey, l_comment,
count(l_tax) from lineitem group by 1, 2, 3) tmpt;
On Oct 28, 2007, at 1:17 PM, Luke Lonergan wrote:
We just applied
: Simon Riggs [mailto:[EMAIL PROTECTED]
Sent: Sunday, October 28, 2007 04:48 PM Eastern Standard Time
To: CK.Tan
Cc: Luke Lonergan; Kenneth Marshall; pgsql-patches@postgresql.org; [EMAIL
PROTECTED]; [EMAIL PROTECTED]
Subject:Re: [PATCHES] updated hash functions for postgresql v1
On Sun, Oct 28, 2007 at 08:06:58PM +, Simon Riggs wrote:
On Sun, 2007-10-28 at 13:05 -0500, Kenneth Marshall wrote:
On Sun, Oct 28, 2007 at 05:27:38PM +, Simon Riggs wrote:
On Sat, 2007-10-27 at 15:15 -0500, Kenneth Marshall wrote:
Its features include a better and faster hash
Dear PostgreSQL Developers,
This patch is a diff -c against the hashfunc.c from postgresql-8.3beta1.
It implements the 2006 version of the hash function by Bob Jenkins. Its
features include a better and faster hash function. I have included the
versions supporting big-endian and little-endian
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