shows how to use omp's timer

srinathv · Apr 1, 2015 · e38891c · e38891c
1 parent 42282c1
commit e38891c
Show file tree

Hide file tree

Showing 2 changed files with 22 additions and 0 deletions.
diff --git a/codingTests/cplusplus/testVec.cpp b/codingTests/cplusplus/testVec.cpp
@@ -29,10 +29,12 @@ int main(){
 #ifdef USE_TAU
   TAU_START("std::vector.push_back loop");
 #endif
+#pragma omp parallel for
     for (int i = 0; i < N; ++i)
     {
         v1.push_back(float(i));
     }
+
 #ifdef USE_TAU
   TAU_STOP("std::vector.push_back loop");
 #endif

diff --git a/codingTests/openmp/omp_get_wtime.cpp b/codingTests/openmp/omp_get_wtime.cpp
@@ -0,0 +1,20 @@
+// omp_get_wtime.cpp
+// compile with: /openmp
+#include <omp.h>
+#include <stdio.h>
+#include <chrono>
+#include <thread>
+
+int main() {
+    double start = omp_get_wtime( );
+//    sleep(1000);
+    std::this_thread::sleep_for(std::chrono::milliseconds(10000));
+    double end = omp_get_wtime( );
+    double wtick = omp_get_wtick( );
+
+    printf("start = %.16g\nend = %.16g\ndiff = %.16g\n",
+             start, end, end - start);
+
+    printf("wtick = %.16g\n1/wtick = %.16g\n",
+             wtick, 1.0 / wtick);
+}