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Notes 2019 01 24
- James Clark
- Marc-Andre Hermanns
- Jithin Jose
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How would we communicate that other functions than our list are allowed?
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Should we allow implementations to allow other functions?
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How would a tool infer which functions are allowed?
- No plans for an API for this in the first version of the API.
Feedback in the virtual meeting was generally positive on extending the list of supported functions. However, concerns were raised as not to overload the interface.
Should we have several classes?
E.g., MPI_T_event_read is mandatory (providing basic functionality)
Should we require calls on a specific CB level?
E.g., MPI_T_event_read needs to be available for every level, MPI_T_event_handle_alloc may be ok to be limited to lower levels.
| Functionname | Include | Minimum Level* | Comment |
|---|---|---|---|
| MPI_T_EVENT_GET_NUM | yes | ? | |
| MPI_T_EVENT_GET_INFO | yes | ? | |
| MPI_T_EVENT_GET_INDEX | yes | ? | |
| MPI_T_EVENT_HANDLE_SET_INFO | yes | ? | |
| MPI_T_EVENT_HANDLE_GET_INFO | yes | ? | |
| MPI_T_EVENT_SET_DROPPED_HANDLER | yes | ? |
* Discussion on Minimum Levels required per function postponed
| Functionname | Include | Minimum Level* | Comment |
|---|---|---|---|
| MPI_T_PVAR_GET_NUM | yes | ? | |
| MPI_T_PVAR_GET_INFO | yes | ? | |
| MPI_T_PVAR_GET_INDEX | yes | ? | |
| MPI_T_PVAR_SESSION_CREATE | maybe | ? | Does a tool need multiple sessions? |
| MPI_T_PVAR_SESSION_FREE | maybe | ? | Does a tool need multiple sessions? |
| MPI_T_PVAR_HANDLE_ALLOC | yes | ? | |
| MPI_T_PVAR_HANDLE_FREE | yes | ? |
* Discussion on Minimum Levels required per function postponed
Should we/can we include variables here? Callbacks are asynchronous on the different processes, thus coordination between processes may be hard/impossible.
- Reading may be valuable for all scopes, writing should only be available for
MPI_T_SCOREP_LOCAL.
Should we include this for completeness?
- Let's revisit this again after reading the Category section.
Feedback from Virtual Meeting was a bit scarce on this, but providing the source index as a parameter to the dropped callback seems the more flexible approach.
- Choose option 2 (Source index delivered to Dropped Handler)