MPI: Difference between revisions

MPI (view source)

924 bytes added , 7 years ago

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@@ Line 619: / Line 619: @@
      return(0);
+}
+}}
+</tab>
+<tab name="Boost (C++)">
+{{File
+  |name=phello3.cpp
+  |lang="cpp"
+  |contents=
+#include <iostream>
+#include <string>
+#include <boost/mpi.hpp>
+using namespace std;
+using namespace boost;
+int main(int argc, char *argv[])
+{
+    mpi::environment env(argc, argv);
+    mpi::communicator world;
+    int rank = world.rank();
+    int size = world.size();
+    string outmessage = "Hello, world! from process " + to_string(rank) + " of " + to_string(size);
+    string inmessage;
+    int sendto = (rank + 1) % size;
+    int recvfrom = (rank + size - 1) % size;
+    cout << outmessage << endl;
+    if (!(rank % 2)) {
+        world.send(sendto,0,outmessage);
+        world.recv(recvfrom,0,inmessage);
+    }
+    else {
+        world.recv(recvfrom,0,inmessage);
+        world.send(sendto,0,outmessage);
+    }
+    cout << "[P_" << rank << "] process " << recvfrom << " said: \"" << inmessage << "\"" << endl;
+    return 0;
 }
 }}