[binutils-gdb] Determine the iteration count based on wallclock instead of user+system time.

[Marcin at sourceware dot org, Ko&#347 at sourceware dot org;cielnicki <mwk at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=fbb7bcbeaad3aebab8935cb4ee5706017b3b9e71

commit fbb7bcbeaad3aebab8935cb4ee5706017b3b9e71
Author: Wei-cheng Wang <cole945@gmail.com>
Date:   Fri Aug 21 01:32:18 2015 +0800

    Determine the iteration count based on wallclock instead of user+system time.
    
    gdb/testsuite/ChangeLog:
    
    2016-02-18  Wei-cheng Wang  <cole945@gmail.com>
    
    	* gdb.trace/tspeed.c (myclock): Return wallclock instead of
    	user+system time.
    	(trace_speed_test): Determine the iteration count for a time
    	between 15..30 seconds.

Diff:
---
 gdb/testsuite/ChangeLog          |  7 +++++++
 gdb/testsuite/gdb.trace/tspeed.c | 16 ++++++----------
 2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index cedbb75..31f8d38 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,10 @@
+2016-02-18  Wei-cheng Wang  <cole945@gmail.com>
+
+	* gdb.trace/tspeed.c (myclock): Return wallclock instead of
+	user+system time.
+	(trace_speed_test): Determine the iteration count for a time
+	between 15..30 seconds.
+
 2016-02-18  Walfred Tedeschi  <walfred.tedeschi@intel.com>
 
 	* gdb.arch/i386-mpx-sigsegv.c: New file.
diff --git a/gdb/testsuite/gdb.trace/tspeed.c b/gdb/testsuite/gdb.trace/tspeed.c
index a379411..5746104 100644
--- a/gdb/testsuite/gdb.trace/tspeed.c
+++ b/gdb/testsuite/gdb.trace/tspeed.c
@@ -56,13 +56,9 @@ int nspertp = 0;
 unsigned long long
 myclock ()
 {
-  struct timeval tm, tm2;
-  struct rusage ru;
-  getrusage (RUSAGE_SELF, &ru);
-  tm = ru.ru_utime;
-  tm2 = ru.ru_stime;
-  return (((unsigned long long) tm.tv_sec) * 1000000) + tm.tv_usec
-    + (((unsigned long long) tm2.tv_sec) * 1000000) + tm2.tv_usec;
+  struct timeval tm;
+  gettimeofday (&tm, NULL);
+  return (((unsigned long long) tm.tv_sec) * 1000000) + tm.tv_usec;
 }
 
 int
@@ -162,9 +158,9 @@ trace_speed_test (void)
     return -1;
 
   if (idelta > mindelta
-      /* Total test time should be between 2 and 5 seconds.  */
-      && (total1 + total2) > (2 * 1000000)
-      && (total1 + total2) < (5 * 1000000)) 
+      /* Total test time should be between 15 and 30 seconds.  */
+      && (total1 + total2) > (15 * 1000000)
+      && (total1 + total2) < (30 * 1000000))
     {
       nsdelta = (((unsigned long long) idelta) * 1000) / iters;
       printf ("Second loop took %d ns longer per iter than first\n", nsdelta);