Changes between Initial Version and Version 1 of MPITransformation

Timestamp:

04/01/14 16:06:35 (12 years ago)

Author:

zmanchun

Comment:

--

MPITransformation

@@ +1 @@
+Given an MPI program:
+
+{{{
+#include <mpi.h>
+ ...
+#include <stdio.h>
+
+int a, b, ...;
+
+... function(){
+  ...
+}
+...
+
+int main(){
+  ....
+}
+}}}
+
+It is translate to a CIVL-C program:
+
+{{{
+#include <mpi.h> // all included files are moved above to the new file scope.
+...
+#include <stdio.h>
+
+$input int argc;//optional, only necessary when the original main function has arguments.
+$input char** argv;//optional, only necessary when the original main function has arguments.
+$input int NPROCS;
+$gcomm GCOMM_WORLD = $gcomm_create($here, NPROCS);
+
+void MPI_Process(int _rank){
+  ...
+}
+
+void main(){
+  $proc procs[NPROCS];
+   
+  for(int i = 0; i < NPROCS; i++){
+    procs[i] = $spawn MPI_Process(i);
+  }
+  for(int i = 0; i < NPROCS; i++){
+    $wait(procs[i]);
+  }
+  $gcomm_destroy(GCOMM_WORLD);
+}
+}}}
+
+Whereas `MPI_Process()` is a wrapper of the original MPI program with some additional :
+
+{{{
+void MPI_Process(){
+  $comm MPI_COMM_WORLD = $comm_create(...);
+  
+  //SLIGHTLY-MODIFIED ORIGINAL PROGRAM;
+  int a, b, ...;
+  ... function(){...}
+  ...
+  ... __main(){...} // renamed main() to __main()
+  ....
+  //ORIGINAL PROGRAM ENDS HERE;
+  __main();
+  $comm_destroy(MPI_COMM_WORLD);
+}
+}}}