add stress, os_perf_state_minimum, min-os-perf, max-os-perf

tools/stress.cpp

@@ -0,0 +1,49 @@
+#include <iostream>
+
+#include <cmath>
+
+#include <omp.h>
+#include <cstring>
+#include <chrono>
+#include <vector>
+#include <iostream>
+
+int main(int argc, char **argv) {
+
+size_t numThreads = std::stoi(argv[1]);
+std::vector<size_t> totals(numThreads, 0);
+omp_set_num_threads(numThreads);
+
+auto start = std::chrono::system_clock::now();
+double time = std::stod(argv[2]);
+
+#pragma omp parallel
+{
+  size_t tid = omp_get_thread_num();
+  double a = rand();
+  while (true) {
+    for (size_t i = 0; i < 500; ++i) {
+      double x;
+      asm volatile(""::"r"(a));
+      x = sqrt(a);
+      asm volatile(""::"r"(x));
+
+      asm volatile(""::"r"(a));
+      x = sqrt(a);
+      asm volatile(""::"r"(x));
+    }
+    totals[tid] += 1000;
+    auto elapsed = (std::chrono::system_clock::now() - start).count() / 1e9;
+    if (elapsed > time) {
+      break;
+    }
+  }
+}
+
+size_t sum = 0;
+for (auto t : totals) {
+  sum += t;
+}
+std::cout << (double)sum / time << "\n";
+
+};