Use the OPAL timers toi report timers as accurately as possible.

This commit was SVN r11442.

ompi/mpi/c/wtick.c

@@ -22,6 +22,7 @@
 #endif
 #include <stdio.h>
 
+#include MCA_timer_IMPLEMENTATION_HEADER
 #include "ompi/mpi/c/bindings.h"
 #include "ompi/runtime/mpiruntime.h"
 
@@ -38,5 +39,12 @@ static const char FUNC_NAME[] = "MPI_Wtick";
 
 double MPI_Wtick(void)
 {
-    return (double)0.000001;
+#if OPAL_TIMER_USEC_NATIVE
+    return 0.000001;
+#else
+    if( (opal_timer_t)0 == opal_timer_base_get_freq() ) {
+        opal_output( 0, "No timer frequency\n" );
+    }
+    return (double)opal_timer_base_get_freq();
+#endif  /* OPAL_TIMER_USEC_NATIVE */
 }

ompi/mpi/c/wtime.c

@@ -22,6 +22,8 @@
 #endif
 #include <stdio.h>
 
+#include MCA_timer_IMPLEMENTATION_HEADER
+#include "opal/prefetch.h"
 #include "ompi/mpi/c/bindings.h"
 #include "ompi/runtime/mpiruntime.h"
 
@@ -38,10 +40,9 @@ static const char FUNC_NAME[] = "MPI_Wtime";
 
 double MPI_Wtime(void)
 {
-    struct timeval tv;
-    double wtime;
-    gettimeofday(&tv, NULL);
-    wtime = tv.tv_sec;
-    wtime += (double)tv.tv_usec / 1000000.0;
-    return wtime;
+#if OPAL_TIMER_USEC_NATIVE
+    return (double)opal_timer_base_get_usec();
+#else
+    return (double)opal_timer_base_get_cycles();
+#endif  /* OPAL_TIMER_USEC_NATIVE */
 }