On 11/13/07 10:02 AM, "Scott Ribe" <scott_ribe@xxxxxxxxxxxxxxx> wrote: > What you're referring to must be that the kernel was essentially > single-threaded, with a single "kernel-funnel" lock. (Because the OS > certainly supported threads, and it was certainly possible to write > highly-threaded applications, and I don't know of any performance problems > with threaded applications.) > > This has been getting progressively better, with each release adding more > in-kernel concurrency. Which means that 10.5 probably obsoletes all prior > postgres benchmarks on OS X. While I've never seen this documented anywhere, it empirically looks like 10.5 also (finally) adds CPU affinity to better utilize instruction caching. On a dual CPU system under 10.4, one CPU bound process would use two CPU's at 50%. Under 10.5 it uses one CPU at 100%. I never saw any resolution to this thread - were the original tests on the Opteron and OS X identical, or were they two different workloads? Wes ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster
