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Automatic timer fallback

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This commit is contained in:
Daniil Brychikov
2022-02-11 17:01:56 +03:00
parent 92b182d47e
commit 73f6c66cde
2 changed files with 106 additions and 38 deletions
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client/TracyProfiler.cpp
+62 -27
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@@ -322,24 +322,50 @@ static void InitFailure( const char* msg )
exit( 1 );
}
static bool checkHardwareSupportsInvariantTSC()
{
const char* noCheck = GetEnvVar( "TRACY_NO_INVARIANT_CHECK" );
if( noCheck && noCheck[0] == '1' )
{
return true;
}
uint32_t regs[4];
CpuId( regs, 1 );
if( !( regs[3] & ( 1 << 4 ) ) )
{
#if !defined TRACY_TIMER_QPC && !defined TRACY_TIMER_FALLBACK
InitFailure( "CPU doesn't support RDTSC instruction." );
#endif
return false;
}
CpuId( regs, 0x80000007 );
if( regs[3] & ( 1 << 8 ) )
{
return true;
}
return false;
}
#if defined TRACY_TIMER_FALLBACK && defined TRACY_HW_TIMER
bool hardwareSupportsInvariantTSC()
{
static bool cachedResult = checkHardwareSupportsInvariantTSC();
return cachedResult;
}
#endif
static int64_t SetupHwTimer()
{
#if !defined TRACY_TIMER_QPC && !defined TRACY_TIMER_FALLBACK
uint32_t regs[4];
CpuId( regs, 1 );
if( !( regs[3] & ( 1 << 4 ) ) ) InitFailure( "CPU doesn't support RDTSC instruction." );
CpuId( regs, 0x80000007 );
if( !( regs[3] & ( 1 << 8 ) ) )
if(!checkHardwareSupportsInvariantTSC())
{
const char* noCheck = GetEnvVar( "TRACY_NO_INVARIANT_CHECK" );
if( !noCheck || noCheck[0] != '1' )
{
#if defined _WIN32
InitFailure( "CPU doesn't support invariant TSC.\nDefine TRACY_NO_INVARIANT_CHECK=1 to ignore this error, *if you know what you are doing*.\nAlternatively you may rebuild the application with the TRACY_TIMER_QPC or TRACY_TIMER_FALLBACK define to use lower resolution timer." );
InitFailure( "CPU doesn't support invariant TSC.\nDefine TRACY_NO_INVARIANT_CHECK=1 to ignore this error, *if you know what you are doing*.\nAlternatively you may rebuild the application with the TRACY_TIMER_QPC or TRACY_TIMER_FALLBACK define to use lower resolution timer." );
#else
InitFailure( "CPU doesn't support invariant TSC.\nDefine TRACY_NO_INVARIANT_CHECK=1 to ignore this error, *if you know what you are doing*.\nAlternatively you may rebuild the application with the TRACY_TIMER_FALLBACK define to use lower resolution timer." );
InitFailure( "CPU doesn't support invariant TSC.\nDefine TRACY_NO_INVARIANT_CHECK=1 to ignore this error, *if you know what you are doing*.\nAlternatively you may rebuild the application with the TRACY_TIMER_FALLBACK define to use lower resolution timer." );
#endif
}
}
#endif
@@ -3451,23 +3477,32 @@ void Profiler::HandleDisconnect()
void Profiler::CalibrateTimer()
{
#ifdef TRACY_HW_TIMER
std::atomic_signal_fence( std::memory_order_acq_rel );
const auto t0 = std::chrono::high_resolution_clock::now();
const auto r0 = GetTime();
std::atomic_signal_fence( std::memory_order_acq_rel );
std::this_thread::sleep_for( std::chrono::milliseconds( 200 ) );
std::atomic_signal_fence( std::memory_order_acq_rel );
const auto t1 = std::chrono::high_resolution_clock::now();
const auto r1 = GetTime();
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 );
#else
m_timerMul = 1.;
#ifdef TRACY_HW_TIMER
# if !defined TRACY_TIMER_QPC && defined TRACY_TIMER_FALLBACK
const bool needCalibration = hardwareSupportsInvariantTSC();
# else
const bool needCalibration = true;
# endif
if (needCalibration)
{
std::atomic_signal_fence( std::memory_order_acq_rel );
const auto t0 = std::chrono::high_resolution_clock::now();
const auto r0 = GetTime();
std::atomic_signal_fence( std::memory_order_acq_rel );
std::this_thread::sleep_for( std::chrono::milliseconds( 200 ) );
std::atomic_signal_fence( std::memory_order_acq_rel );
const auto t1 = std::chrono::high_resolution_clock::now();
const auto r1 = GetTime();
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
}