Postgresql & 64 Bit Opteron

[Ericson Smith]

Hi,

We're thinking of moving to a 64 bit platform for our database. Does
anyone have any stories of migration from 32 bit to 64 bits?
* How did it impact performance?
* Were there any gochas?
* What processors were used (any AMD Opteron's so far?)

Also what kind of performance increase could we expect if we moved from
a dual 32 bit to a quad 32 bit platform. (We are already using speedy
10,000 RPM SCSI disks in RAID configuration, with gobs of RAM.)

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Warmest regards,
Ericson Smith
Tracking Specialist/DBA
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[Joshua D. Drake]

Hello,

It depends entirely on many different issues. There are a couple of
real benefits you will get from the Opteron but only
if you actually need them.

1. Throughput. The Opteron FSB is the same speed as the chip itself.
2. Addressable memory (1 TB I believe).

However, generally the number one culprit in performance for a
database is IO... Adding more hard drives will help
(generally speaking) than anything else. Of course that is assuming you
have enough RAM.

The other thing to remember is that you will need to run 7.4 to get
Opteron support so you may have actual database
migration issues if you are running 7.3 or previous.

Sincerely,

Joshua D. Drake
Ericson Smith wrote:

Hi,

We're thinking of moving to a 64 bit platform for our database. Does
anyone have any stories of migration from 32 bit to 64 bits?
* How did it impact performance?
* Were there any gochas?
* What processors were used (any AMD Opteron's so far?)

Also what kind of performance increase could we expect if we moved
from a dual 32 bit to a quad 32 bit platform. (We are already using
speedy 10,000 RPM SCSI disks in RAID configuration, with gobs of RAM.)

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