bfs benchmark

benchmarks/opencl/bfs/timer.cc

@@ -0,0 +1,78 @@
+#include <cstdlib>
+#include <cstring>
+#include <fstream>
+#include <iomanip>
+
+#include "timer.h"
+
+
+using namespace std;
+
+double timer::CPU_speed_in_MHz = timer::get_CPU_speed_in_MHz();
+
+
+double timer::get_CPU_speed_in_MHz()
+{
+#if defined __linux__
+    ifstream infile("/proc/cpuinfo");
+    char     buffer[256], *colon;
+
+    while (infile.good()) {
+	infile.getline(buffer, 256);
+
+	if (strncmp("cpu MHz", buffer, 7) == 0 && (colon = strchr(buffer, ':')) != 0)
+	    return atof(colon + 2);
+    }
+#endif
+
+    return 0.0;
+}
+
+
+void timer::print_time(ostream &str, const char *which, double time) const
+{
+    static const char *units[] = { " ns", " us", " ms", "  s", " ks", 0 };
+    const char	      **unit   = units;
+
+    time = 1000.0 * time / CPU_speed_in_MHz;
+
+    while (time >= 999.5 && unit[1] != 0) {
+	time /= 1000.0;
+	++ unit;
+    }
+
+    str << which << " = " << setprecision(3) << setw(4) << time << *unit;
+}
+
+
+ostream &timer::print(ostream &str)
+{
+    str << left << setw(25) << (name != 0 ? name : "timer") << ": " << right;
+
+    if (CPU_speed_in_MHz == 0)
+	str << "could not determine CPU speed\n";
+    else if (count > 0) {
+	double total = static_cast<double>(total_time);
+
+	print_time(str, "avg", total / static_cast<double>(count));
+	print_time(str, ", total", total);
+	str << ", count = " << setw(9) << count << '\n';
+    }
+    else
+	str << "not used\n";
+
+    return str;
+}
+
+
+ostream &operator << (ostream &str, class timer &timer)
+{
+    return timer.print(str);
+}
+
+double timer::getTimeInSeconds()
+{
+    double total = static_cast<double>(total_time);
+    double res = (total / 1000000.0) / CPU_speed_in_MHz;
+    return res;
+}