a regular thread, and you can explore the state of each of them as
usual.
@verbatim
-smpirun -wraper valgrind ...other args...
-smpirun -wraper "gdb -args" --cfg=contexts/factory:thread ...other args...
+smpirun -wrapper valgrind ...other args...
+smpirun -wrapper "gdb --args" --cfg=contexts/factory:thread ...other args...
@endverbatim
@subsection SMPI_use_colls Simulating collective operations