PGAS Programming with UPC and Fortran Coarrays

Debugging barriersthe optional value exp can be used to check that all threads havereached the same barrierif a thread executes a barrier with different exp tag than the otherthreads, the application reports an expression mismatch and aborts very useful for making sure that all threads are on theintended execution pathUPC 23Work sharing revisited4 th parameter in upc_forall loop represents affinityevaluate if MYTHREAD will execute an iterationaffinity is an integer expression affinity % THREADS == MYTHREADaffinity is a pointer-to-shared object pointed to has affinity to MYTHREAD upc_threadof(affinity)UPC 24–12