WRT 64-bit and Postgres, it depends on the CPU as to whether you see a
simple performance benefit. On the Opteron you will see a benefit when
doing CPU bound work. When doing the CPU portion, the additional registers
of the Opteron running in 64-bit mode are used by the compiler to produce a
20-30% boost in performance. On the Xeon in 64-bit mode, the same regions
of execution will slow down by about 5%.
Is that true of even Woodcrest?
Joshua D. Drake
Postgres benefits automatically from the larger memory addressing of the
64-bit kernel by using the larger I/O cache of Linux.
- Luke
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TIP 6: explain analyze is your friend
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
