Draft: Fortran Support

Testing using level 2

Disqualified Tests:

• Passing NULL/MPI_REQUEST_NULL causes compile errors in Fortran, disqualifying InvalidParam tests that do this
  • Disqualifies 17 tests (lvl1) / 136 (lvl2)
• A lot of tests are currently removed due to datatypes, i.e., MPI C types that do not exist / are not implemented yet for Fortran
  • No effect on lvl1, as only MPI_INT and MPI_DOUBLE are used / 501 disqualified (lvl2)

Unfixable, but not disqualified:

• InvalidParam-Status-mpi_recv-002: MPI_STATUSES_IGNORE rejected by compiler, different rank than expected
  • Error class does not exist for Fortran. Disqualifies 1 test (lvl1) / 16 (lvl2)

MPI Issues:

• https://github.com/open-mpi/ompi/issues/9534 - Causes issues with Precv_Init / Psend_init. Need recent OpenMPI version to avoid this
• https://github.com/open-mpi/ompi/pull/13308 - Bug in OpenMPI-git causes compilation failure as well

Types are translated from C to Fortran where applicable, though currently only for MPI_INT -> MPI_INTEGER, MPI_DOUBLE -> MPI_DOUBLE_PRECISION, MPI_C_BOOL -> MPI_LOGICAL as most Fortran MPI types are optional. Tests are formatted using fprettify (available from pip, added to Pipfile).

Common Issues encountered:

• MPI does not differentiate between bool and int, but does between integer and logical.
  • Workaround: Use bool where applicable in C code, then translate to logical
• Different integer size expectations cause compilation failures (no automatic extension)
  • Workaround: During parsing of apis.json, save the integer width, and perform explicit widening if needed.
• C usage of address-of-integer as a one-dimensional array does not work in Fortran
  • Workaround: Replace uses thereof with proper arrays
• Array Indexing starts at 1
  • Workaround: Implement explicit indexing to match C

MPI-BugBench bugs (since remembering to write them down):

• Deadlock in CallOrdering-mpi_improbe-mpi_send-001, wrong parameter used as flag
  • Note: Deadlock also happens in InvalidParam-flag-mpi_iprobe-002, but intended? (not_allocated flag is not waited on, but the "normal" one)

scripts/Infrastructure/TemplateFactory.py

@@ -879,16 +879,14 @@ def get_intercomm(comm_create_func: str, tm: TemplateManager, before_idx: int =
         call = MPICallFactory.mpi_comm_group("MPI_COMM_WORLD", "&" + world_group)
         call.set_identifier(identifier)
         tm.insert_instruction(call, before_instruction=before_inst)
-        inst = Instruction("int triplet[3];"
-                           "triplet[0] =0;"
-                           "triplet[1] =nprocs;"
-                           "triplet[2] =2;", identifier=identifier)
-        tm.insert_instruction(inst, before_instruction=before_inst)
+        tm.add_stack_variable("int", "triplet", arr_dim=3)
+        tm.insert_instruction(ArrAsgn("triplet", 0, 0), before_instruction=before_inst)
+        tm.insert_instruction(ArrAsgn("triplet", 1, "nprocs"), before_instruction=before_inst)
+        tm.insert_instruction(ArrAsgn("triplet", 2, 2), before_instruction=before_inst)
         call = MPICallFactory.mpi_group_incl(world_group, "1", "&triplet", "&" +even_group)
         call.set_identifier(identifier)
         tm.insert_instruction(call, before_instruction=before_inst)
-        inst = Instruction("triplet[0] =1;", identifier=identifier)
-        tm.insert_instruction(inst, before_instruction=before_inst)
+        tm.insert_instruction(ArrAsgn("triplet", 0, 1), before_instruction=before_inst)
         call = MPICallFactory.mpi_group_incl(world_group, "1", "&triplet", "&" +odd_group)
         call.set_identifier(identifier)
         tm.insert_instruction(call, before_instruction=before_inst)