하이퍼스레딩 구성을 고려하여 물리적 프로세서 및 코어 수를 정확하게 결정하려면 어떻게 해야 합니까?

<code class="c++">#include <iostream>
#include <string>

void cpuID(unsigned i, unsigned regs[4]);

int main() {
  unsigned regs[4];
  char vendor[12];

  // Get vendor
  cpuID(0, regs);
  ((unsigned *)vendor)[0] = regs[1];
  ((unsigned *)vendor)[1] = regs[3];
  ((unsigned *)vendor)[2] = regs[2];
  string cpuVendor = string(vendor, 12);

  // Get CPU features
  cpuID(1, regs);
  unsigned cpuFeatures = regs[3];

  // Logical core count per CPU
  cpuID(1, regs);
  unsigned logical = (regs[1] >> 16) & 0xff;
  cout << " logical cpus: " << logical << endl;
  unsigned cores = logical;

  if (cpuVendor == "GenuineIntel") {
    // Get DCP cache info
    cpuID(4, regs);
    cores = ((regs[0] >> 26) & 0x3f) + 1;
  } else if (cpuVendor == "AuthenticAMD") {
    // Get NC: Number of CPU cores - 1
    cpuID(0x80000008, regs);
    cores = ((unsigned)(regs[2] & 0xff)) + 1;
  }

  cout << "    cpu cores: " << cores << endl;

  // Detect hyper-threads
  bool hyperThreads = cpuFeatures & (1 << 28) && cores < logical;
  cout << "hyper-threads: " << (hyperThreads ? "true" : "false") << endl;

  return 0;
}</code>