RandomTime.cpp
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/**
* \file RandomTime.cpp
* \brief Timing %RandomLib
*
* Compile/link with, e.g.,\n
* g++ -I../include -O2 -funroll-loops
* -o RandomTime RandomTime.cpp ../src/Random.cpp\n
* ./RandomTime
*
* See \ref timing, for more information.
*
* Copyright (c) Charles Karney (2006-2011) <charles@karney.com> and licensed
* under the MIT/X11 License. For more information, see
* http://randomlib.sourceforge.net/
**********************************************************************/
#include <iostream>
#include <iomanip>
#include <vector>
#include <string>
#include <ctime>
#if !defined(_MSC_VER)
#include <sys/time.h>
#else
#include <windows.h>
#include <winbase.h>
#endif
#include <RandomLib/Random.hpp>
#include <RandomLib/NormalDistribution.hpp>
#include <RandomLib/RandomSelect.hpp>
#if defined(_MSC_VER)
// Squelch warnings about constant conditional expressions
# pragma warning (disable: 4127)
#endif
double HighPrecMult() {
#if defined(_MSC_VER)
LARGE_INTEGER t;
QueryPerformanceFrequency((LARGE_INTEGER *)&t);
return 1.0/(t.HighPart*std::pow(2.0, 32) + t.LowPart);
#else
return 1.e-6;
#endif
}
long long HighPrecTime() {
#if defined(_MSC_VER)
LARGE_INTEGER t;
QueryPerformanceCounter((LARGE_INTEGER *)&t);
return (static_cast<long long>(t.HighPart) << 32) +
static_cast<long long>(t.LowPart);
#else
timeval t;
gettimeofday(&t, NULL);
return static_cast<long long>(t.tv_sec) * 1000000LL +
static_cast<long long>(t.tv_usec);
#endif
}
// estime is the estimated time for the command in ns. The command is executed
// as many time as necessary to fill a second.
#define TIME(expr,esttime) { \
long long t1, t2; \
long long c1 = r.Count(); \
size_t m = int(1.e9/esttime+1); \
t1=HighPrecTime(); \
for (size_t j = m; j; --j) { expr; } \
t2=HighPrecTime(); \
std::cout << std::setprecision(1) << std::setw(8) << std::scientific \
<< 0.1*std::floor((t2-t1)*HighPrecMult()*1.0e10/m+0.5) << "ns "; \
std::string cmd(#expr); \
std::string::size_type p; \
p = cmd.find("template "); \
if (p != std::string::npos) cmd = cmd.substr(0,p) + cmd.substr(p+9); \
p = cmd.find(" = "); \
if (p != std::string::npos) cmd = cmd.substr(p + 3); \
p = cmd.find("Random::"); \
if (p != std::string::npos) cmd = cmd.substr(0,p)+cmd.substr(p+8); \
p = cmd.find("std::"); \
if (p != std::string::npos) cmd = cmd.substr(0,p)+cmd.substr(p+5); \
if (cmd[0] == '(') \
cmd = cmd.substr(1,cmd.size()-2); \
std::cout << std::setprecision(1) << std::setw(5) << std::fixed \
<< (r.Count()-c1)/float(m) << "rv" << " per " << cmd << "\n"; \
}
template<typename Random>
void Time(Random& r) {
volatile bool b = false;
volatile unsigned i = 0, n = 0;
volatile typename Random::result_type ii = 0;
volatile unsigned long long l = 0;
volatile float f = 0;
volatile double d = 0;
std::vector<unsigned long> v;
ii = r();
if (ii == 0) n = 1;
std::cout << "Using " << r.Name() << " with seed "
<< r.SeedString() << "\n";
std::cout << "Time system random number generator\n";
TIME(i = rand(), 1.0e+01);
std::cout << "Time generation of integer results\n";
TIME(ii = r(), 2.0e+00);
TIME(i = r.template Integer<unsigned>(), 2.6e+00);
TIME(l = r.template Integer<unsigned long long>(), 4.3e+00);
TIME(i = (r.template Integer<unsigned,6>()), 2.6e+00);
TIME(i = r.template Integer<unsigned>(52u), 5.6e+00);
TIME(i = r.template Integer<unsigned>(52u+n), 1.3e+01);
std::cout << "Time generation of real results\n";
TIME(f = r.template Fixed<float>(), 4.9e+00);
TIME(d = r.template Fixed<double>(), 9.5e+00);
TIME(f = r.template Float<float>(), 1.9e+01);
TIME(d = r.template Float<double>(), 1.8e+01);
std::cout << "Time generation of boolean results\n";
TIME(b = r.template Prob<float>(0.28f), 1.1e+01);
TIME(b = r.template Prob<double>(0.28), 7.7e+00);
std::cout << "Time generation of normal distribution\n";
RandomLib::NormalDistribution<float> nf;
RandomLib::NormalDistribution<double> nd;
TIME(f = nf(r), 4.1e+01);
TIME(d = nd(r), 5.4e+01);
std::cout << "Time returning starting seeds\n";
TIME(i = Random::SeedWord(), 1.1e+06);
TIME(v = Random::SeedVector(), 1.9e+04);
r.Reset();
std::cout << "Time getting the ready for first random result\n";
TIME((r.Reset(), r.SetCount(0)), 6.9e+03);
r.SetCount(123);
std::cout << "Time stepping the generator forward and back\n";
TIME(r.StepCount(10000), 6.3e+03);
TIME(r.StepCount(-10000), 1.1e+04);
std::cout << "Time sampling from a discrete distribution\n";
// Weights for throwing a pair of dice
unsigned w[] = { 0, 0, 1, 2, 3, 4, 5, 6, 5, 4, 3, 2, 1 };
RandomLib::RandomSelect<float> seld(w, w+13);
TIME(i = seld(r), 2.8e+01);
std::vector<int> a(101);
for (int m = 0; m < 101; ++m) a[m] = m;
std::cout << "Time shuffling 100 numbers\n";
TIME(std::random_shuffle(a.begin(), a.end(), r), 1.3e+03);
r.SetStride(10);
std::cout << "Time with stride = 10\n";
TIME(ii = r(), 1.0e+01);
TIME(d = nd(r), 8.7e+01);
r.SetStride(100);
std::cout << "Time with stride = 100\n";
TIME(ii = r(), 6.8e+01);
TIME(d = nd(r), 4.1e+02);
r.SetStride();
// Avoid warning about set but unused variables
if (b && i == 0 && l == 0 && f == 0 && d == 0)
r.StepCount(0);
return;
}
int main(int, char**) {
try {
{
typedef RandomLib::SRandom32 R;
R::SelfTest();
R r;
r.StepCount(123);
Time<R>(r);
}
{
typedef RandomLib::SRandom64 R;
R::SelfTest();
R r;
r.StepCount(123);
Time<R>(r);
}
if (false) {
// Skip timing MRandom{32,64}
{
typedef RandomLib::MRandom32 R;
R::SelfTest();
R r;
r.StepCount(123);
Time<R>(r);
}
{
typedef RandomLib::MRandom64 R;
R::SelfTest();
R r;
r.StepCount(123);
Time<R>(r);
}
}
return 0;
}
catch (const std::exception& e) {
std::cerr << "Caught exception: " << e.what() << "\n";
return 1;
}
catch (...) {
std::cerr << "Caught unknown exception\n";
return 1;
}
}