TL: minor changes

Author: tlunet

pySDC/helpers/fieldsIO.py

@@ -518,7 +518,7 @@ def setupMPI(cls, comm: MPI.Intracomm, iLoc, nLoc):
         cls.comm = comm
         cls.iLoc = iLoc
         cls.nLoc = nLoc
-        cls.mpiFile = None
+        cls.mpiFile:MPI.File = None
 
     @property
     def MPI_ON(self):

pySDC/playgrounds/dedalus/sdc.py

@@ -763,15 +763,17 @@ def initSpaceTimeMPI(nProcSpace=None, nProcTime=None, groupTime=False):
         if gRank == 0:
             print(' -- finished MPI initialization')
 
-        # MPI decomposition -- space are close
+        # MPI space-time decomposition
         if groupTime:
+            # time-ranks are consecutive global ranks
             sColor = gRank % nProcTime
             sComm = gComm.Split(sColor, gRank)
             gComm.Barrier()
             tColor = (gRank - gRank % nProcTime) / nProcTime
             tComm = gComm.Split(tColor, gRank)
             gComm.Barrier()
         else:
+            # space-ranks are consecutive global ranks
             tColor = gRank % nProcSpace
             tComm = gComm.Split(tColor, gRank)
             gComm.Barrier()