>> What re-architecting would be needed?

> I'm asking that it be admitted that it has not been looked at. Not
> seriously. Nor is this unique to PostgreSQL. I expect the performance
> for Linux applications in general to slowly improve on 64-bit
> processors as more and more people begin to use it. I recall a few
> threads on other mailing lists where the primary developers admitted
> to not having ready access to a 64-bit machine. Until they do, the
> chance that these applications are hand-tuned for 64-bit is unlikely.

What you seem to be asking for is that we engage in a lot of
machine-specific tuning for some particular processor or other.
That has not happened and will not happen.  This project believes
in portable code, not "optimized for Xeon-of-the-month" code.

                        regards, tom lane

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