[Mpi3-tools] Meeting Notes from 5/11, next meetings

[Marty Itzkowitz]

On 5/27/09 12:42 AM, Supalov, Alexander wrote:
> Hi everybody,
>
> I added my comments to the proposal for lack of feedback per email. Please consider at F2F. Slight correction to item 5: 
>
> Reads "Likewise, the MPI-stall can probably be fairly well statistically approximated by mapping PC to the progress engine routines and its dependants."
>
> Should read "Likewise, the MPI-stall can probably be fairly well statistically approximated by mapping PC to the progress engine routines and its dependants, except memcpy and equivalents, and wire access routines".
>   

Yes, that's true, but it implies that the tools would know a lot of 
detail about the MPI implementation.
We wanted to avoid that, since every MPI implementation (and the Sun 
profiling tools
support seven different versions) is different.

In the Sun MPI profiler we also (by default, although it can be changed) 
suppress all call frames
below the first user call into MPI, to avoid overwhelming the user with 
details that he or she
can do nothing about.  Doing so removed more than half the functions 
from the function
list data for a run.

    Marty