mpi/c: Force wtick/wtime to use gettimeofday

* See https://github.com/open-mpi/ompi/issues/3003 for a discussion about
   this patch. Once we get a better version in place we can revert this
   change.

Signed-off-by: Joshua Hursey <jhursey@us.ibm.com>

ompi/mpi/c/wtick.c

@@ -12,6 +12,7 @@
  * Copyright (c) 2007-2014 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2015-2016 Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
+ * Copyright (c) 2017      IBM Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -40,6 +41,12 @@ double MPI_Wtick(void)
 {
     OPAL_CR_NOOP_PROGRESS();
 
+    /*
+     * See https://github.com/open-mpi/ompi/issues/3003
+     * For now we are forcing the use of gettimeofday() until we find a
+     * more portable solution.
+     */
+#if 0
 #if OPAL_TIMER_CYCLE_NATIVE
     {
         opal_timer_t freq = opal_timer_base_get_freq();
@@ -52,6 +59,7 @@ double MPI_Wtick(void)
     }
 #elif OPAL_TIMER_USEC_NATIVE
     return 0.000001;
+#endif
 #else
     /* Otherwise, we already return usec precision. */
     return 0.000001;

ompi/mpi/c/wtime.c

@@ -12,6 +12,7 @@
  * Copyright (c) 2006-2014 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2015      Research Organization for Information Science
  *                         and Technology (RIST). All rights reserved.
+ * Copyright (c) 2017      IBM Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -40,10 +41,17 @@ double MPI_Wtime(void)
 {
     double wtime;
 
+    /*
+     * See https://github.com/open-mpi/ompi/issues/3003
+     * For now we are forcing the use of gettimeofday() until we find a
+     * more portable solution.
+     */
+#if 0
 #if OPAL_TIMER_CYCLE_NATIVE
     wtime = ((double) opal_timer_base_get_cycles()) / opal_timer_base_get_freq();
 #elif OPAL_TIMER_USEC_NATIVE
     wtime = ((double) opal_timer_base_get_usec()) / 1000000.0;
+#endif
 #else
     /* Fall back to gettimeofday() if we have nothing else */
     struct timeval tv;