[Boost-commit] svn:boost r82637 - trunk/libs/thread/example

Subject: [Boost-commit] svn:boost r82637 - trunk/libs/thread/example
From: vicente.botet_at_[hidden]
Date: 2013-01-27 12:29:24

Author: viboes
Date: 2013-01-27 12:29:24 EST (Sun, 27 Jan 2013)
New Revision: 82637
URL: http://svn.boost.org/trac/boost/changeset/82637

Log:
Thread: Added performance test for shared_mutex.
Added:
   trunk/libs/thread/example/perf_shared_mutex.cpp   (contents, props changed)

Added: trunk/libs/thread/example/perf_shared_mutex.cpp
==============================================================================
--- (empty file)
+++ trunk/libs/thread/example/perf_shared_mutex.cpp	2013-01-27 12:29:24 EST (Sun, 27 Jan 2013)
@@ -0,0 +1,75 @@
+//  (C) Copyright 2013 Andrey
+//  (C) Copyright 2013 Vicente J. Botet Escriba
+//
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+// This performance test is based on the performance test provided by maxim.yegorushkin
+// at https://svn.boost.org/trac/boost/ticket/7422
+
+#define BOOST_THREAD_DONT_PROVIDE_INTERRUPTIONS
+#define BOOST_THREAD_USES_CHRONO
+
+#include <iostream>
+#include <boost/thread/lock_types.hpp>
+#include <boost/thread/thread.hpp>
+#include <boost/chrono/stopwatches/simple_stopwatch.hpp>
+#include <boost/chrono/chrono_io.hpp>
+
+#include <boost/thread/shared_mutex.hpp>
+
+using namespace boost;
+
+shared_mutex mtx;
+const int cycles = 10000;
+
+void shared()
+{
+  int cycle(0);
+  while (++cycle < cycles)
+  {
+    shared_lock<shared_mutex> lock(mtx);
+  }
+}
+
+void unique()
+{
+  int cycle(0);
+  while (++cycle < cycles)
+  {
+    unique_lock<shared_mutex> lock(mtx);
+  }
+}
+typedef boost::chrono::simple_stopwatch<> Stopwatch;
+
+int main()
+{
+  boost::chrono::high_resolution_clock::duration best_time(std::numeric_limits<boost::chrono::high_resolution_clock::duration::rep>::max());
+  for (int i =100; i>0; --i) {
+    boost::chrono::high_resolution_clock clock;
+    boost::chrono::high_resolution_clock::time_point s1 = clock.now();
+    thread t0(shared);
+    thread t1(shared);
+    thread t2(unique);
+    //thread t11(shared);
+    //thread t12(shared);
+    //thread t13(shared);
+
+    t0.join();
+    t1.join();
+    t2.join();
+    //t11.join();
+//    t12.join();
+  //  t13.join();
+    boost::chrono::high_resolution_clock::time_point f1 = clock.now();
+    //std::cout << "     Time spent:" << (f1 - s1) << std::endl;
+    best_time = std::min(best_time, f1 - s1);
+
+  }
+  std::cout << "Best Time spent:" << best_time << std::endl;
+  std::cout << "Time spent/cycle:" << best_time/cycles/3 << std::endl;
+
+  return 1;
+}
+