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Merge pull request #325 from BrychDaneel/automatic_timer_fallback

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Automatic timer fallback
This commit is contained in:
Bartosz Taudul 2022-02-21 13:47:50 +01:00 committed by GitHub
commit d318f75123
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 94 additions and 38 deletions
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83
client/TracyProfiler.cpp
View File

@ -325,24 +325,44 @@ 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
@ -3465,23 +3485,32 @@ 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
}

49
client/TracyProfiler.hpp
View File

@ -26,11 +26,11 @@
# include <mach/mach_time.h>
#endif
#if !defined TRACY_TIMER_FALLBACK && ( defined _WIN32 || ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 ) || ( defined TARGET_OS_IOS && TARGET_OS_IOS == 1 ) )
#if ( defined _WIN32 || ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 ) || ( defined TARGET_OS_IOS && TARGET_OS_IOS == 1 ) )
# define TRACY_HW_TIMER
#endif
#if !defined TRACY_HW_TIMER
#if defined TRACY_TIMER_FALLBACK || !defined TRACY_HW_TIMER
# include <chrono>
#endif
@ -68,6 +68,23 @@ TRACY_API bool ProfilerAvailable();
TRACY_API bool ProfilerAllocatorAvailable();
TRACY_API int64_t GetFrequencyQpc();
#if defined TRACY_TIMER_FALLBACK && defined TRACY_HW_TIMER && ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
TRACY_API bool HardwareSupportsInvariantTSC(); // check, if we need fallback scenario
#else
# if defined TRACY_HW_TIMER
tracy_force_inline bool HardwareSupportsInvariantTSC()
{
return true; // this is checked at startup
}
# else
tracy_force_inline bool HardwareSupportsInvariantTSC()
{
return false;
}
# endif
#endif
struct SourceLocationData
{
const char* name;
@ -167,25 +184,33 @@ public:
{
#ifdef TRACY_HW_TIMER
# if defined TARGET_OS_IOS && TARGET_OS_IOS == 1
return mach_absolute_time();
if( HardwareSupportsInvariantTSC() ) return mach_absolute_time();
# elif defined _WIN32
# ifdef TRACY_TIMER_QPC
return GetTimeQpc();
# else
return int64_t( __rdtsc() );
if( HardwareSupportsInvariantTSC() ) return int64_t( __rdtsc() );
# endif
# elif defined __i386 || defined _M_IX86
uint32_t eax, edx;
asm volatile ( "rdtsc" : "=a" (eax), "=d" (edx) );
return ( uint64_t( edx ) << 32 ) + uint64_t( eax );
if( HardwareSupportsInvariantTSC() )
{
uint32_t eax, edx;
asm volatile ( "rdtsc" : "=a" (eax), "=d" (edx) );
return ( uint64_t( edx ) << 32 ) + uint64_t( eax );
}
# elif defined __x86_64__ || defined _M_X64
uint64_t rax, rdx;
asm volatile ( "rdtsc" : "=a" (rax), "=d" (rdx) );
return (int64_t)(( rdx << 32 ) + rax);
if( HardwareSupportsInvariantTSC() )
{
uint64_t rax, rdx;
asm volatile ( "rdtsc" : "=a" (rax), "=d" (rdx) );
return (int64_t)(( rdx << 32 ) + rax);
}
# else
# error "TRACY_HW_TIMER detection logic needs fixing"
# endif
#else
#endif
#if !defined TRACY_HW_TIMER || defined TRACY_TIMER_FALLBACK
# if defined __linux__ && defined CLOCK_MONOTONIC_RAW
struct timespec ts;
clock_gettime( CLOCK_MONOTONIC_RAW, &ts );
@ -194,6 +219,8 @@ public:
return std::chrono::duration_cast<std::chrono::nanoseconds>( std::chrono::high_resolution_clock::now().time_since_epoch() ).count();
# endif
#endif
return 0; // unreacheble branch
}
tracy_force_inline uint32_t GetNextZoneId()