From 960adfbc3e19b684f5f3839782f2c1399eabd533 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 30 Apr 2014 19:52:18 +0200
Subject: Add performance example

---
 examples/performance/driver.cxx | 138 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 examples/performance/driver.cxx

(limited to 'examples/performance/driver.cxx')

diff --git a/examples/performance/driver.cxx b/examples/performance/driver.cxx
new file mode 100644
index 0000000..7d096d6
--- /dev/null
+++ b/examples/performance/driver.cxx
@@ -0,0 +1,138 @@
+// file      : examples/performance/driver.cxx
+// copyright : not copyrighted - public domain
+
+#include <string>
+#include <fstream>
+#include <iostream>
+
+#include <xml/parser.hxx>
+
+#include "time.hxx"
+
+using namespace std;
+using namespace xml;
+
+const unsigned long iterations = 1000;
+
+int
+main (int argc, char* argv[])
+{
+  if (argc != 2)
+  {
+    cerr << "usage: " << argv[0] << " <xml-file>" << endl;
+    return 1;
+  }
+
+  try
+  {
+    ifstream ifs;
+    ifs.exceptions (ios_base::failbit);
+    ifs.open (argv[1], ios::in | ios::ate);
+
+    size_t size (ifs.tellg ());
+    ifs.seekg (0, ios::beg);
+
+    char* buf = new char[size];
+    ifs.read (buf, size);
+
+    cerr << "  document size:  " << size << " bytes" << endl;
+
+    unsigned long start_count;
+    unsigned long end_count;
+
+    // Warmup.
+    //
+    for (unsigned long i (0); i < 10; ++i)
+    {
+      start_count = 0;
+      end_count = 0;
+
+      // Configure the parser to receive attributes as events without
+      // creating the attribute map.
+      //
+      parser p (buf,
+                size,
+                argv[1],
+                parser::receive_default | parser::receive_attributes_event);
+
+      for (parser::event_type e (p.next ()); e != parser::eof; e = p.next ())
+      {
+        switch (e)
+        {
+        case parser::start_element:
+          start_count++;
+          break;
+        case parser::end_element:
+          end_count++;
+          break;
+        default:
+          break;
+        }
+      }
+    }
+
+    cerr << "  elements:       " << start_count << endl;
+
+    os::time start;
+
+    for (unsigned long i (0); i < iterations; ++i)
+    {
+      start_count = 0;
+      end_count = 0;
+
+      // Configure the parser to receive attributes as events without
+      // creating the attribute map.
+      //
+      parser p (buf,
+                size,
+                argv[1],
+                parser::receive_default | parser::receive_attributes_event);
+
+      for (parser::event_type e (p.next ()); e != parser::eof; e = p.next ())
+      {
+        switch (e)
+        {
+        case parser::start_element:
+          start_count++;
+          break;
+        case parser::end_element:
+          end_count++;
+          break;
+        default:
+          break;
+        }
+      }
+    }
+
+    os::time end;
+
+    delete[] buf;
+
+    os::time time (end - start);
+    double ms (
+      static_cast<double> (
+        time.sec () * 1000000ULL + time.nsec () / 1000ULL));
+
+    cerr << "  time:           " << time << " sec" << endl;
+
+    // Calculate throughput in documents/sec.
+    //
+    double tpd ((iterations / ms) * 1000000);
+    cerr << "  throughput:     " << tpd << " documents/sec" << endl;
+
+    // Calculate throughput in MBytes/sec.
+    //
+    double tpb (((size * iterations) / ms) * 1000000/(1024*1024));
+    cerr << "  throughput:     " << tpb << " MBytes/sec" << endl;
+  }
+  catch (const ios_base::failure&)
+  {
+    cerr << "io failure" << endl;
+    return 1;
+  }
+  catch (const xml::exception& e)
+  {
+    cerr << e.what () << endl;
+    return 1;
+  }
+}
-- 
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