> 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%.
> Postgres benefits automatically from the larger memory addressing > of the 64-bit kernel by using the larger I/O cache of Linux. Main benefit Postgres in 64-bit mode possible only in case dedicated DB server on system with RAM > 3GB and use most part of RAM for shared buffers and avoid persistent moving buffers between OS cache and shared memory. On system with RAM below 2-3GB to difficult found serious gain of performance. Best regards, Alexander Kirpa ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq