Re: PostgreSQL on 64 bit Linux

> 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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