From 9d9d81ad71a52c33ba4db9f8a6059d435d279316 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Sun, 9 Mar 2008 16:13:47 +0000
Subject:  * basic support for multicore CPU via a .evalOMP() which   
 internaly uses OpenMP if enabled at compile time.  * added a bench/ folder
 with a couple benchmarks and benchmark tools.

---
 bench/BenchTimer.h | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 bench/BenchTimer.h

(limited to 'bench/BenchTimer.h')

diff --git a/bench/BenchTimer.h b/bench/BenchTimer.h
new file mode 100644
index 000000000..e86c6ce13
--- /dev/null
+++ b/bench/BenchTimer.h
@@ -0,0 +1,75 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra. Eigen itself is part of the KDE project.
+//
+// Copyright (C) 2008 Gael Guennebaud <g.gael@free.fr>
+// Copyright (C) 2006-2008 Benoit Jacob <jacob@math.jussieu.fr>
+//
+// Eigen is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 3 of the License, or (at your option) any later version.
+//
+// Alternatively, you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License and a copy of the GNU General Public License along with
+// Eigen. If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef EIGEN_BENCH_TIMER_H
+#define EIGEN_BENCH_TIMER_H
+
+#include <sys/time.h>
+#include <unistd.h>
+#include <cstdlib>
+
+namespace Eigen
+{
+
+/** Elapsed time timer keeping the best try.
+  */
+class BenchTimer
+{
+public:
+
+  BenchTimer() : m_best(1e99) {}
+
+  ~BenchTimer() {}
+
+  inline void start(void) {m_start = getTime();}
+  inline void stop(void)
+  {
+    m_best = std::min(m_best, getTime() - m_start);
+  }
+
+  /** Return the best elapsed time.
+    */
+  inline double value(void)
+  {
+      return m_best;
+  }
+
+  static inline double getTime(void)
+  {
+      struct timeval tv;
+      struct timezone tz;
+      gettimeofday(&tv, &tz);
+      return (double)tv.tv_sec + 1.e-6 * (double)tv.tv_usec;
+  }
+
+protected:
+
+  double m_best, m_start;
+
+};
+
+}
+
+#endif // EIGEN_BENCH_TIMER_H
-- 
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