1 files changed, 112 insertions, 0 deletions
diff --git a/tests/functional_tests/cpu_power_test.cpp b/tests/functional_tests/cpu_power_test.cpp
new file mode 100644
index 000000000..54c4bfc9f
--- /dev/null
+++ b/tests/functional_tests/cpu_power_test.cpp
@@ -0,0 +1,112 @@
+// Copyright (c) 2014-2021, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+const char * descr = 
+"This program prints the time (ms) needed to calculate a mathematical challenge. It's purpose \n\
+is to be able to use the result to compare the CPU power available on the machine it's being executed \n\
+and under the given circumstances, which can differ for the same machine. For example: \n\
+The printed value will be different when using 2 of 2 cores, when there an another process \n\
+running on one of the cores core, and when no other intense process running. \n\
+ \n\
+The program expects a one argument: a numerical value of the threads to start the calculations on. \n\
+ \n\
+Prints: \n\
+Time to calculate a mathematical challenge in MILLISECONDS. \n\
+ \n\
+Returns: \n\
+0 on success, \n\
+1 on a missing argument, \n\
+2 on an incorrect format of the argument.\n";
+
+#include <iostream>
+#include <future>
+#include <vector>
+#include <sstream>
+#include <chrono>
+
+using namespace std;
+
+/**
+Uses Leibniz Formula for Pi.
+https://en.wikipedia.org/wiki/Leibniz_formula_for_%CF%80
+*/
+static double calcPi(const size_t max_iter)
+{
+    const double n = 4;
+    double pi = 0;
+    double d = 1;
+    for (size_t i = 1; i < max_iter; ++i)
+    {
+        const double a = 2.0 * (i % 2) - 1.0;
+        pi += a * n / d;
+        d += 2;
+    }
+    return pi;
+}
+
+int main(int argc, const char ** argv)
+{
+    const size_t max_iter = 1e9;
+    if (argc < 2)
+    {
+        cout << "Please pass the number of threads to run.\n";
+        
+        cout << '\n' << descr << '\n';
+        return 1;
+    }
+    
+    // Convert argument to an integer.
+    int numThreads = 1;
+    const char * numThreadsStr = argv[1];
+    std::istringstream iss(numThreadsStr);
+    if (! (iss >> numThreads) )
+    {
+        cout << "Incorrect format of number of threads = '" << numThreadsStr << "'\n";
+        return 2;
+    }
+    // Run the calculation in parallel.
+    std::vector<std::future<double>> futures;
+    for(int i = 0; i < numThreads; ++i) 
+    {
+        futures.push_back(std::async(calcPi, max_iter));
+    }    
+    
+    // Start measuring the time.
+    const std::chrono::steady_clock::time_point tbegin = std::chrono::steady_clock::now();
+    for(auto & e : futures) 
+    {
+       e.get();
+    }
+    // Stop measuring the time.
+    const std::chrono::steady_clock::time_point tend = std::chrono::steady_clock::now();
+    
+    // Print the measured duration.
+    cout << std::chrono::duration_cast<std::chrono::milliseconds>(tend - tbegin).count() << std::endl;
+    return 0;
+}
+