Talking to our system guys, my understanding is that this LPAR has 4 CPU's dedicated, with 2 more allowed, so it is capped at 6. NMON shows 24 CPU's available. As I watch nmon, we see that the first thread on each CPU is typically running at 50% usage or better. I see cpu 9 and 3 getting some usage (second thread on cpu's 3 and 4), but other than that only the first thread on each CPU is being used. I assume the first thread is the primary. SMT 4 is being used. The processes getting CPU are all oracle<SID> (LOCAL=NO), so sqlnet connections. On Wed, Mar 4, 2015 at 10:16 AM, Rich Jesse < rjoralist3@xxxxxxxxxxxxxxxxxxxxx> wrote: > Hey John, > > > This is power7 in a dedicated LPAR. > > An LPAR is IBM's term for a VM. So, is there just one LPAR on your POWER7? > I'd think there'd also be at least 2 more for VIOs, but that's stretching > my > knowledge limits... > > SMT also comes into play here. By default, the LPAR should be using SMT4, > which means that 1 virtual CPU core will be shown as 4 logical CPUs. You > should be able to see this in the "p" screen of nmon. > > You mentioned "1 thread per CPU". It sounds like you might be thinking of > Oracle on Windows? If so, Oracle doesn't run the same in Unix/Linux. The > background processes will be exposed as individual processes in AIX instead > of Windows threads in a single process. > > Which Oracle process shows at 50% (e.g. using the "u" screen in nmon)? > That > could give a big clue... > > Let us know! > > Rich > > > On Wed, Mar 4, 2015 at 9:49 AM, Stefan Koehler <contact@xxxxxxxx> wrote: > > > >> >> we see that Oracle appears to be using only 1 thread per CPU almost > all > >> the time. > >> You mean one vCPU = one thread, right? The CPU usage can also be shown > as > >> 50%, but it is not 50% in reality - it depends on the used entitlement > per > >> vCPU. > > [snip] > > -- > //www.freelists.org/webpage/oracle-l > > >