timer: hack use of clock_gettime

better solution needed later
 workaround for #3003

Signed-off-by: Howard Pritchard <[email protected]>

Author: hppritcha

ompi/mpi/c/wtick.c

@@ -60,8 +60,13 @@ double MPI_Wtick(void)
 #elif OPAL_TIMER_USEC_NATIVE
     return 0.000001;
 #endif
+#else
+#if defined(__linux__) && OPAL_HAVE_CLOCK_GETTIME
+    /* QAD no call clock_getres */
+    return 1.0e-09;
 #else
     /* Otherwise, we already return usec precision. */
     return 0.000001;
 #endif
+#endif
 }

ompi/mpi/c/wtime.c

@@ -25,6 +25,9 @@
 #include <sys/time.h>
 #endif
 #include <stdio.h>
+#ifdef HAVE_TIME_H
+#include <time.h>
+#endif  /* HAVE_TIME_H */
 
 #include MCA_timer_IMPLEMENTATION_HEADER
 #include "ompi/mpi/c/bindings.h"
@@ -52,12 +55,18 @@ double MPI_Wtime(void)
 #elif OPAL_TIMER_USEC_NATIVE
     wtime = ((double) opal_timer_base_get_usec()) / 1000000.0;
 #endif
+#else
+#if defined(__linux__) && OPAL_HAVE_CLOCK_GETTIME
+    struct timespec tp = {.tv_sec = 0, .tv_nsec = 0};
+    (void) clock_gettime(CLOCK_MONOTONIC, &tp);
+    return (tp.tv_sec + tp.tv_nsec/1.0e+9);
 #else
     /* Fall back to gettimeofday() if we have nothing else */
     struct timeval tv;
     gettimeofday(&tv, NULL);
     wtime = tv.tv_sec;
     wtime += (double)tv.tv_usec / 1000000.0;
+#endif
 #endif
 
     OPAL_CR_NOOP_PROGRESS();