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Modify test harness to show host CPU cycle efficiency.

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Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
This commit is contained in:
Adrian.Conlon 2017-06-25 23:48:15 +01:00
parent a7d9cb0116
commit d22b695682
1 changed files with 16 additions and 2 deletions
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18
inc/TestHarness.h
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@ -14,10 +14,16 @@ namespace EightBit {
std::cout << std::endl; std::cout << std::endl;
std::cout.imbue(std::locale("")); std::cout.imbue(std::locale(""));
std::cout << "Cycles = " << m_totalCycles << std::endl; std::cout << "Guest cycles = " << m_totalCycles << std::endl;
std::cout << "Seconds = " << getElapsedSeconds() << std::endl; std::cout << "Seconds = " << getElapsedSeconds() << std::endl;
std::cout << getCyclesPerSecond() << " cycles/second" << std::endl; std::cout << getCyclesPerSecond() << " cycles/second" << std::endl;
auto elapsedHostCycles = m_finishHostCycles - m_startHostCycles;
std::cout << "Host cycles = " << elapsedHostCycles << std::endl;
auto efficiency = elapsedHostCycles / m_totalCycles;
std::cout << "Efficiency = " << efficiency << std::endl;
} }
std::chrono::steady_clock::duration getElapsedTime() const { std::chrono::steady_clock::duration getElapsedTime() const {
@ -35,12 +41,14 @@ namespace EightBit {
void runLoop() { void runLoop() {
m_startTime = now(); m_startTime = now();
m_totalCycles = 0UL; m_totalCycles = 0UL;
m_startHostCycles = currentHostCycles();
auto& cpu = m_board.getCPUMutable(); auto& cpu = m_board.getCPUMutable();
while (!cpu.isHalted()) { while (!cpu.isHalted()) {
m_totalCycles += cpu.step(); m_totalCycles += cpu.step();
} }
m_finishHostCycles = currentHostCycles();
m_finishTime = now(); m_finishTime = now();
} }
@ -54,9 +62,15 @@ namespace EightBit {
long long m_totalCycles; long long m_totalCycles;
std::chrono::steady_clock::time_point m_startTime; std::chrono::steady_clock::time_point m_startTime;
std::chrono::steady_clock::time_point m_finishTime; std::chrono::steady_clock::time_point m_finishTime;
unsigned __int64 m_startHostCycles;
unsigned __int64 m_finishHostCycles;
std::chrono::steady_clock::time_point now() { static std::chrono::steady_clock::time_point now() {
return std::chrono::steady_clock::now(); return std::chrono::steady_clock::now();
} }
static unsigned __int64 currentHostCycles() {
return __rdtsc();
}
}; };
} }