update example/mpi-nompi print order

- example/mpi-nompi/hello.cc: force deterministic print order by sleeping after print statements. Signed-off-by: Aiden Woodruff <[email protected]>
SCOREC · Feb 19, 2025 · 54dc9ce · 54dc9ce
1 parent 28eaa3a
commit 54dc9ce
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/example/mpi-nompi/hello.cc b/example/mpi-nompi/hello.cc
@@ -1,4 +1,6 @@
+#include <chrono>
 #include <iostream>
+#include <thread>
 
 #include <mpi.h>
 #include <PCU.h>
@@ -23,6 +25,8 @@ int main(int argc, char** argv) {
     if (rank == i)
       std::cout << "Hello from MPI rank: " << rank << "; PCU rank: " <<
         PCUObj->Self() << std::endl;
+    // Print deterministically please and thank you.
+    std::this_thread::sleep_for(std::chrono::milliseconds(5));
     MPI_Barrier(MPI_COMM_WORLD);
   }
   // Test SCOREC functions.
@@ -38,6 +42,8 @@ int main(int argc, char** argv) {
     if (rank == i)
       std::cout << "MPI(" << rank << ") sum: " << sum <<
       "; PCU sum: " << psum << std::endl;
+    // Print deterministically please and thank you.
+    std::this_thread::sleep_for(std::chrono::milliseconds(5));
     MPI_Barrier(MPI_COMM_WORLD);
   }
   // Test Allgather
@@ -53,6 +59,8 @@ int main(int argc, char** argv) {
       print_array(pvals1, PCUObj->Peers());
       std::cout << std::endl;
     }
+    // Print deterministically please and thank you.
+    std::this_thread::sleep_for(std::chrono::milliseconds(5));
     MPI_Barrier(MPI_COMM_WORLD);
   }
   delete vals1;
@@ -69,6 +77,8 @@ int main(int argc, char** argv) {
       print_array(pvals2, 2 * PCUObj->Peers());
       std::cout << std::endl;
     }
+    // Print deterministically please and thank you.
+    std::this_thread::sleep_for(std::chrono::milliseconds(5));
     MPI_Barrier(MPI_COMM_WORLD);
   }
   delete vals2;