STREAM: Use nano- rather than microsecond precision internally

1 files changed, 11 insertions, 13 deletions

diff --git a/Microbenchmarks/STREAM/support/timer.h b/Microbenchmarks/STREAM/support/timer.h
index b53d95f..901baac 100644
--- a/Microbenchmarks/STREAM/support/timer.h
+++ b/Microbenchmarks/STREAM/support/timer.h
@@ -33,27 +33,25 @@
  *

  */

 

-#include <sys/time.h>

+#include <time.h>

 

-typedef struct Timer{

+typedef struct Timer {

 

-    struct timeval startTime[7];

-    struct timeval stopTime[7];

-    double         time[7];

+    struct timespec startTime[7];

+    struct timespec stopTime[7];

+    uint64_t        nanoseconds[7];

 

-}Timer;

+} Timer;

 

 void start(Timer *timer, int i, int rep) {

     if(rep == 0) {

-        timer->time[i] = 0.0;

+        timer->nanoseconds[i] = 0;

     }

-    gettimeofday(&timer->startTime[i], NULL);

+    clock_gettime(CLOCK_MONOTONIC, &timer->startTime[i]);

 }

 

 void stop(Timer *timer, int i) {

-    gettimeofday(&timer->stopTime[i], NULL);

-    timer->time[i] += (timer->stopTime[i].tv_sec - timer->startTime[i].tv_sec) * 1000000.0 +

-                      (timer->stopTime[i].tv_usec - timer->startTime[i].tv_usec);

+    clock_gettime(CLOCK_MONOTONIC, &timer->stopTime[i]);

+    timer->nanoseconds[i] += (timer->stopTime[i].tv_sec - timer->startTime[i].tv_sec) * 1000000000 +

+                             (timer->stopTime[i].tv_nsec - timer->startTime[i].tv_nsec);

 }

-

-void print(Timer *timer, int i, int REP) { printf("Time (ms): %f\t", timer->time[i] / (1000 * REP)); }