On Fri, Jan 18, 2019 at 12:24:20PM -0500, Vince Weaver wrote:
> On Fri, 18 Jan 2019, Peter Zijlstra wrote:
> >
> > You can actually use rdpmc when you attach to a CPU, but you have to
> > ensure that the userspace component is guaranteed to run on that very
> > CPU (sched_setaffinity(2) comes to
On Fri, 18 Jan 2019, Peter Zijlstra wrote:
>
> You can actually use rdpmc when you attach to a CPU, but you have to
> ensure that the userspace component is guaranteed to run on that very
> CPU (sched_setaffinity(2) comes to mind).
unfortunately the HPC people using PAPI would probably be
On Fri, Jan 18, 2019 at 09:09:04AM -0500, Vince Weaver wrote:
> On Fri, 18 Jan 2019, Peter Zijlstra wrote:
>
> > On Fri, Jan 11, 2019 at 04:52:22PM -0500, Vince Weaver wrote:
> > > On Thu, 10 Jan 2019, Vince Weaver wrote:
> > >
> > > > On Thu, 10 Jan 2019, Vince Weaver wrote:
> > > >
> > > > >
On Fri, 18 Jan 2019, Peter Zijlstra wrote:
> On Fri, Jan 11, 2019 at 04:52:22PM -0500, Vince Weaver wrote:
> > On Thu, 10 Jan 2019, Vince Weaver wrote:
> >
> > > On Thu, 10 Jan 2019, Vince Weaver wrote:
> > >
> > > > On Thu, 10 Jan 2019, Vince Weaver wrote:
> > > >
> > > > > However if you
On Fri, Jan 11, 2019 at 04:52:22PM -0500, Vince Weaver wrote:
> On Thu, 10 Jan 2019, Vince Weaver wrote:
>
> > On Thu, 10 Jan 2019, Vince Weaver wrote:
> >
> > > On Thu, 10 Jan 2019, Vince Weaver wrote:
> > >
> > > > However if you create an all-process attached to CPU event:
> > > >
On Thu, 10 Jan 2019, Vince Weaver wrote:
> On Thu, 10 Jan 2019, Vince Weaver wrote:
>
> > On Thu, 10 Jan 2019, Vince Weaver wrote:
> >
> > > However if you create an all-process attached to CPU event:
> > > perf_event_open(attr, -1, X, -1, 0);
> > > the mmap event index is set as if this were
On Thu, 10 Jan 2019, Vince Weaver wrote:
> On Thu, 10 Jan 2019, Vince Weaver wrote:
>
> > However if you create an all-process attached to CPU event:
> > perf_event_open(attr, -1, X, -1, 0);
> > the mmap event index is set as if this were a valid event and so the rdpmc
> > succeeds even
On Thu, 10 Jan 2019, Vince Weaver wrote:
> However if you create an all-process attached to CPU event:
> perf_event_open(attr, -1, X, -1, 0);
> the mmap event index is set as if this were a valid event and so the rdpmc
> succeeds even though it shouldn't (we're trying to read an event value
Hello
I think this is a bug turned up by PAPI. I've been trying to track down
where this happens in the perf_event code myself, but it might be faster
to just report it.
If you create a per-process attached to CPU event:
perf_event_open(attr, 0, X, -1, 0);
the mmap event index is set
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