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Use rdtscp to measure time on windows.

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This commit is contained in:
Bartosz Taudul 2017-09-23 21:33:05 +02:00
parent bd9ffc16b5
commit 7770014844
2 changed files with 38 additions and 2 deletions
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37
client/TracyProfiler.cpp
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@ -4,6 +4,11 @@
# include <sys/time.h>
#endif
#if defined _MSC_VER || defined __CYGWIN__
# include <intrin.h>
#endif
#include <atomic>
#include <assert.h>
#include <chrono>
#include <limits>
@ -40,8 +45,7 @@ Profiler s_profiler;
static Profiler* s_instance = nullptr;
Profiler::Profiler()
: m_timeBegin( GetTime() )
, m_mainThread( GetThreadHandle() )
: m_mainThread( GetThreadHandle() )
, m_shutdown( false )
, m_id( 0 )
, m_stream( LZ4_createStream() )
@ -51,6 +55,9 @@ Profiler::Profiler()
assert( !s_instance );
s_instance = this;
CalibrateTimer();
m_timeBegin = GetTime();
m_thread = std::thread( [this] { Worker(); } );
SetThreadName( m_thread, "Tracy Profiler" );
}
@ -74,7 +81,12 @@ uint64_t Profiler::GetNewId()
int64_t Profiler::GetTime()
{
#if defined _MSC_VER || defined __CYGWIN__
unsigned int ui;
return int64_t( __rdtscp( &ui ) * s_instance->m_timerMul );
#else
return std::chrono::duration_cast<std::chrono::nanoseconds>( std::chrono::high_resolution_clock::now().time_since_epoch() ).count();
#endif
}
uint64_t Profiler::ZoneBegin( QueueZoneBegin&& data )
@ -245,4 +257,25 @@ bool Profiler::HandleServerQuery()
return true;
}
void Profiler::CalibrateTimer()
{
#if defined _MSC_VER || defined __CYGWIN__
unsigned int ui;
std::atomic_signal_fence( std::memory_order_acq_rel );
const auto t0 = std::chrono::high_resolution_clock::now();
const auto r0 = __rdtscp( &ui );
std::atomic_signal_fence( std::memory_order_acq_rel );
std::this_thread::sleep_for( std::chrono::milliseconds( 100 ) );
std::atomic_signal_fence( std::memory_order_acq_rel );
const auto t1 = std::chrono::high_resolution_clock::now();
const auto r1 = __rdtscp( &ui );
std::atomic_signal_fence( std::memory_order_acq_rel );
const auto dt = std::chrono::duration_cast<std::chrono::nanoseconds>( t1 - t0 ).count();
const auto dr = r1 - r0;
m_timerMul = double( dt ) / double( dr );
#endif
}
}

3
client/TracyProfiler.hpp
View File

@ -36,6 +36,9 @@ private:
bool HandleServerQuery();
void CalibrateTimer();
double m_timerMul;
int64_t m_timeBegin;
uint64_t m_mainThread;
std::thread m_thread;