Martijn van Oosterhout <> writes:
> Can you think of any places at all where 64-bit would make a difference
> to processing? 64-bit gives you more memory, and on some x86 chips, more
> registers, but that's it.

It would be interesting to look into making int8 and float8 be
pass-by-value datatypes to save palloc overhead on machines where
Datum is going to be 8 bytes wide anyway.  Of course this would
only help queries that use those datatypes extensively, and it
might be an insignificant savings anyhow :-(

For the most part though I think that the main advantage of 64-bit
for a database is the ability to address more memory.  We've been
working slowly towards allowing PG to make better use of large
numbers of shared buffers, for instance.

                        regards, tom lane

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