Tom Arthurs wrote:
According to my research, you only need a 64 bit image if you are
going to be doing intensive floating point operations (which most db
servers don't do). Some benchmarking results I've found on the
internet indicate that 64 bit executables can be slower than 32 bit
versions. I've been running 32 bit compiles on solaris for several years.
How much memory do you have on that sparc box? Allocating more than
about 7-12% to shared buffers has proven counter productive for us (it
slows down).
The system has 8 CPUs w/ 32 GB - I'm hoping to see some benefit to large
caches -
Am I missing something key with postgreSQL?
Yes - we have seen with oracle 64 bit that there can be as much as a 10%
hit moving
from 32 - but we make it up big time with large db-buffer sizes that
drastically
reduce I/O and allow for other things (like more connections). Maybe
the expectation of less I/O is not correct?
Don
P.S. built with the Snapshot from two weeks ago.
Kernel buffers are another animal. :)
Donald Courtney wrote:
Get FATAL when starting up (64 bit) with large shared_buffers setting
I built a 64 bit for Sparc/Solaris easily but I found that the
startup of postmaster generates a FATAL diagnostic due to going
over the 2GB limit (3.7 GB).
When building for 64 bit is there some other
things that must change in order to size UP the shared_buffers?
Thanks.
Don C.
P.S. A severe checkpoint problem I was having was fixed with
"checkpoint_segments=200".
Message:
FATAL: 460000 is outside the valid range for parameter
"shared_buffers" (16 .. 262143)
LOG: database system was shut down at 2005-06-07 15:20:28 EDT
Mike Rylander wrote:
On 06 Jun 2005 12:53:40 -0500, Mark Rinaudo <[EMAIL PROTECTED]>
wrote:
I'm not sure if this is the appropriate list to post this question to
but i'm starting with this one because it is related to the
performance
of Postgresql server. I have a Penguin Computing dual AMD 64 bit
opteron machine with 8 Gigs of memory. In my attempt to increase the
number of shared_buffers from the default to 65000 i was running
into a
semget error when trying to start Postgresql. After reading the
documentation I adjusted the semaphore settings in the kernel to allow
Postgresql to start successfully. With this configuration running
if I
do a ipcs -u i get the following.
On my HP-585, 4xOpteron, 16G RAM, Gentoo Linux (2.6.9):
$ ipcs -u i
------ Shared Memory Status --------
segments allocated 1
pages allocated 34866
pages resident 31642
pages swapped 128
Swap performance: 0 attempts 0 successes
------ Semaphore Status --------
used arrays = 7
allocated semaphores = 119
------ Messages: Status --------
allocated queues = 0
used headers = 0
used space = 0 bytes
Did you perhaps disable spinlocks when compiling PG?
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