From 1d9b43e154b838b2a46359d56b913410fb4611c9 Mon Sep 17 00:00:00 2001
From: kronbichler <kronbichler@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Wed, 7 Jan 2009 08:06:20 +0000
Subject: [PATCH] Timer class can now also return the wall time.

git-svn-id: https://svn.dealii.org/trunk@18110 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/base/include/base/timer.h | 29 +++++++++++++++++++++++++++--
 deal.II/base/source/timer.cc      | 31 +++++++++++++++++++++++++++++--
 2 files changed, 56 insertions(+), 4 deletions(-)

diff --git a/deal.II/base/include/base/timer.h b/deal.II/base/include/base/timer.h
index 654f31066a..140e0d13b9 100644
--- a/deal.II/base/include/base/timer.h
+++ b/deal.II/base/include/base/timer.h
@@ -2,7 +2,7 @@
 //    $Id$
 //    Version: $Name$
 //
-//    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 by the deal.II authors
+//    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009 by the deal.II authors
 //
 //    This file is subject to QPL and may not be  distributed
 //    without copyright and license information. Please refer
@@ -52,7 +52,7 @@ DEAL_II_NAMESPACE_OPEN
  * @note Implementation of this class is system
  * dependent. Unfortunately, it does not work with multithreading
  * right now. In this case, we would like to sum up the time needed by
- * all children. Furthermore, a wall clock option would be nice.
+ * all children.
  *
  * @ingroup utilities
  * @author G. Kanschat, W. Bangerth
@@ -95,6 +95,14 @@ class Timer
 				      */
     double operator() () const;
 
+				     /**
+				      * Access to the current wall time
+				      * without disturbing time
+				      * measurement. The elapsed time is
+				      * returned in units of seconds.
+				      */
+    double wall_time () const;
+
   private:
 
 				     /**
@@ -128,6 +136,14 @@ class Timer
 				      */
     double              start_time_children;
 
+				     /**
+				      * Value of the wall time when start()
+				      * was called the last time or when the
+				      * object was created and no stop() was
+				      * issued in between.
+				      */
+    double              start_wall_time;
+
 				     /**
 				      * Accumulated time for all previous
 				      * start()/stop() cycles. The time for
@@ -136,6 +152,15 @@ class Timer
     double              cumulative_time;
 
 
+				     /**
+				      * Accumulated waoo time for all
+				      * previous start()/stop() cycles. The
+				      * wall time for the present cycle is
+				      * not included.
+				      */
+    double              cumulative_wall_time;
+
+
 				     /**
 				      * Store whether the timer is presently
 				      * running.
diff --git a/deal.II/base/source/timer.cc b/deal.II/base/source/timer.cc
index 9f5208ea5a..eda6649283 100644
--- a/deal.II/base/source/timer.cc
+++ b/deal.II/base/source/timer.cc
@@ -2,7 +2,7 @@
 //    $Id$
 //    Version: $Name$
 //
-//    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006 by the deal.II authors
+//    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2005, 2006, 2009 by the deal.II authors
 //
 //    This file is subject to QPL and may not be  distributed
 //    without copyright and license information. Please refer
@@ -35,7 +35,8 @@ DEAL_II_NAMESPACE_OPEN
 
 Timer::Timer()
                 :
-                cumulative_time (0.)
+                cumulative_time (0.),
+		cumulative_wall_time (0.)
 {
   start();
 }
@@ -45,6 +46,11 @@ Timer::Timer()
 void Timer::start ()
 {
   running    = true;
+
+  struct timeval wall_timer;
+  gettimeofday(&wall_timer, NULL);
+  start_wall_time = wall_timer.tv_sec + 1.e-6 * wall_timer.tv_usec;
+
   rusage usage;
   getrusage (RUSAGE_SELF, &usage);
   start_time = usage.ru_utime.tv_sec + 1.e-6 * usage.ru_utime.tv_usec;
@@ -71,6 +77,11 @@ double Timer::stop ()
       const double dtime_children =
 	usage_children.ru_utime.tv_sec + 1.e-6 * usage_children.ru_utime.tv_usec;
       cumulative_time += dtime_children - start_time_children;
+
+      struct timeval wall_timer;
+      gettimeofday(&wall_timer, NULL);
+      cumulative_wall_time += wall_timer.tv_sec + 1.e-6 * wall_timer.tv_usec 
+	- start_wall_time;
     }
   return cumulative_time;
 }
@@ -98,9 +109,25 @@ double Timer::operator() () const
 
 
 
+double Timer::wall_time () const
+{
+  if (running)
+    {
+      struct timeval wall_timer;
+      gettimeofday(&wall_timer, NULL);
+      return wall_timer.tv_sec + 1.e-6 * wall_timer.tv_usec - start_wall_time + 
+	cumulative_wall_time;
+    }
+  else
+    return cumulative_wall_time;
+}
+
+
+
 void Timer::reset ()
 {
   cumulative_time = 0.;
+  cumulative_wall_time = 0.;
   running         = false;
 }
 
-- 
2.39.5