Charm++ parallel programming system

[Jozsef Bakosi <jbakosi AT lanl.gov>]

Thanks Ronak,

Okay, then what is measured/denoted by DiagCG::DiagCG_rhs? (That is a
separate color and is not an entry method.) Could it be the following?

 entry void wait4rhs() {
    when ownrhs_complete( tk::Fields& dif ), comrhs_complete()
          serial "rhs" { solve( dif ); } }

I suspect DiagCG::DiagCG_rhs stands for the above DAG label "rhs". If
this is the case, than that measures the cost of solve(). Correct?

Jozsef

On 12.18.2019 18:02, Ronak Buch wrote:
> Hi Jozsef,
> 
> redn_wrapper_advance(CkReductionMsg*impl_msg) just denotes that advance was
> called via a reduction. It includes the unpacking of variables from the
> message after it's been received, but it doesn't include communication or
> synchronization costs.
> 
> Since advance() calls rhs() directly (as in not via a proxy), the time
> spent inside that call to rhs() is also attributed to it.
> 
> Thanks,
> Ronak
> 
> On Wed, Dec 18, 2019 at 1:07 PM Jozsef Bakosi 
> <jbakosi AT lanl.gov>
>  wrote:
> 
> > Hi folks,
> >
> > I have a projections question: I have the following function names when I
> > hover over "Usage Profile" or "Timeline" plots:
> >
> > DiagCG::DiagCG_rhs and
> > DiagCG::redn_wrapper_advance(CkReductionMsg*impl_msg)
> >
> > The corresponding code is the following (DiagCG is a chare array):
> >
> > void
> > DiagCG::dt()
> > {
> >   // Contribute to minimum dt across all chares the advance to next step
> >   contribute( sizeof(tk::real), &mindt, CkReduction::min_double,
> >               CkCallback(CkReductionTarget(DiagCG,advance), thisProxy) );
> > }
> >
> > void
> > DiagCG::advance( tk::real newdt )
> > {
> >   // Compute rhs for next time step
> >   rhs();
> > }
> >
> > void
> > DiagCG::rhs()
> > {
> >   ...
> > }
> >
> > I would like to know how to interpret the usage (percentage) associated to
> > DiagCG::DiagCG_rhs and
> > DiagCG::redn_wrapper_advance(CkReductionMsg*impl_msg). More specifically,
> > what does the latter include in this case? The
> > communication/synchronization costs of the all-to-all? Does it also 
> > involve
> > what advance() calls, e.g., rhs()?
> >
> > Please let me know if you need more information.
> >
> > Thanks,
> > Jozsef