Added a timing test for the single/multi threaded perf ratio (~2:1)

[SVN r12821]

shared_ptr_timing_test.cpp

@@ -0,0 +1,23 @@
+#include <boost/shared_ptr.hpp>
+#include <iostream>
+#include <vector>
+#include <ctime>
+
+int const n = 8 * 1024 * 1024;
+
+int main()
+{
+    std::vector< boost::shared_ptr<int> > v;
+    boost::shared_ptr<int> pi(new int);
+
+    std::clock_t t = std::clock();
+
+    for(int i = 0; i < n; ++i)
+    {
+        v.push_back(pi);
+    }
+
+    t = std::clock() - t;
+
+    std::cout << static_cast<double>(t) / CLOCKS_PER_SEC << '\n';
+}