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).

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?


Don C.

P.S.  A severe checkpoint problem I was having was fixed with


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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