Thanks for your concern. We are doing experiments on how the cache influences the performance. Since the 4 threads on each physical core share the same cache, performance should be different depending on whether 4 threads are on the same core or not. And we want to measure this difference in our programs. Since we can set the affinity of the processes and cpu, we want to make it clear which physical core we have binded our processes to. Is there any other mechanism in Linux we could utilize to approach this goal? Thanks. On 8/14/07, David Miller <davem@xxxxxxxxxxxxx> wrote: > From: "jiaqi zhang" <zation.busy@xxxxxxxxx> > Date: Tue, 14 Aug 2007 09:34:26 +1200 > > > Since I have to do some more tests on the cache problem of UltraSPARC > > T1, > > What is this "cache problem"? > > > I have to know the exact physical cpu id of each strand. Could > > anyone give me some clues on how the physical cpu number, or the > > physical core number maps the 32 cpu id? > > Only the hypervisor and the ALOM knows this, and there is no > Hypervisor API to easily obtain this information. > > Why do you need to know the physical strand? > > You'll be better off describing what you're trying to accomplish > rather than starting from the approach you've already selected. > - To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
