Dear all, I hope all of you had a good start into the new year. Let me apologize in advance for the lengthy text following. I am currently in the discussion with the developers of the metric modules for Scalasca and Score-P, and I think we need some clarification. Please correct me in my understanding if anything of the following is not correct. Here is the current quote of the advice to users in the ticket PDF: "[...]Further, there is no guarantee that number of variables, variable indices, and variable names are the same across processes." I read the following out of this: A variable indicating a metric X may be called "foo" on one process and "bar" on another. Is that correct? a) How should a tool aggregate and correlate metrics if there is no way on knowing which belong together (after all indices and names are different)? b) Does this allow the namespaces of metrics to overlap? If the variable for metric X is "foo" on one process and "bar" on another. Is the other process allowed to have a variable "foo" that actually reports some different metric? How will a tool get the difference? I know that the new "Advice to implementers" is supposed to clarify this. But I am unsure whether making this a sole "quality of implementation" issue will work for providers of portable tools. Also, with differences among runs, tools like the Cube Algebra (where you can compute averages of multiple measurements) do not work anymore, as Cube will not know whether "foo" of run one correlates to "foo" of run two, rendering the whole tool moot. Cheers, Marc-Andre -- Marc-Andre Hermanns German Research School for Simulation Sciences GmbH c/o Laboratory for Parallel Programming 52062 Aachen | Germany Tel +49 241 80 99753 Fax +49 241 80 6 99753 Web www.grs-sim.de Members: Forschungszentrum Jülich GmbH | RWTH Aachen University Registered in the commercial register of the local court of Düren (Amtsgericht Düren) under registration number HRB 5268 Registered office: Jülich Executive board: Prof. Marek Behr, Ph.D | Prof. Dr. Sebastian M. Schmidt