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https://github.com/wolfpld/tracy.git
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Automatic timer fallback
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parent
92b182d47e
commit
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@ -322,24 +322,50 @@ static void InitFailure( const char* msg )
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exit( 1 );
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}
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static bool checkHardwareSupportsInvariantTSC()
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{
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const char* noCheck = GetEnvVar( "TRACY_NO_INVARIANT_CHECK" );
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if( noCheck && noCheck[0] == '1' )
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{
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return true;
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}
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uint32_t regs[4];
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CpuId( regs, 1 );
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if( !( regs[3] & ( 1 << 4 ) ) )
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{
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#if !defined TRACY_TIMER_QPC && !defined TRACY_TIMER_FALLBACK
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InitFailure( "CPU doesn't support RDTSC instruction." );
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#endif
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return false;
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}
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CpuId( regs, 0x80000007 );
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if( regs[3] & ( 1 << 8 ) )
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{
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return true;
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}
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return false;
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}
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#if defined TRACY_TIMER_FALLBACK && defined TRACY_HW_TIMER
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bool hardwareSupportsInvariantTSC()
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{
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static bool cachedResult = checkHardwareSupportsInvariantTSC();
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return cachedResult;
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}
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#endif
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static int64_t SetupHwTimer()
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{
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#if !defined TRACY_TIMER_QPC && !defined TRACY_TIMER_FALLBACK
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uint32_t regs[4];
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CpuId( regs, 1 );
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if( !( regs[3] & ( 1 << 4 ) ) ) InitFailure( "CPU doesn't support RDTSC instruction." );
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CpuId( regs, 0x80000007 );
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if( !( regs[3] & ( 1 << 8 ) ) )
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if(!checkHardwareSupportsInvariantTSC())
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{
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const char* noCheck = GetEnvVar( "TRACY_NO_INVARIANT_CHECK" );
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if( !noCheck || noCheck[0] != '1' )
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{
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#if defined _WIN32
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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." );
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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." );
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#else
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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." );
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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." );
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#endif
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}
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}
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#endif
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@ -3451,23 +3477,32 @@ void Profiler::HandleDisconnect()
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void Profiler::CalibrateTimer()
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{
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#ifdef TRACY_HW_TIMER
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std::atomic_signal_fence( std::memory_order_acq_rel );
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const auto t0 = std::chrono::high_resolution_clock::now();
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const auto r0 = GetTime();
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std::atomic_signal_fence( std::memory_order_acq_rel );
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std::this_thread::sleep_for( std::chrono::milliseconds( 200 ) );
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std::atomic_signal_fence( std::memory_order_acq_rel );
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const auto t1 = std::chrono::high_resolution_clock::now();
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const auto r1 = GetTime();
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std::atomic_signal_fence( std::memory_order_acq_rel );
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const auto dt = std::chrono::duration_cast<std::chrono::nanoseconds>( t1 - t0 ).count();
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const auto dr = r1 - r0;
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m_timerMul = double( dt ) / double( dr );
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#else
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m_timerMul = 1.;
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#ifdef TRACY_HW_TIMER
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# if !defined TRACY_TIMER_QPC && defined TRACY_TIMER_FALLBACK
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const bool needCalibration = hardwareSupportsInvariantTSC();
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# else
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const bool needCalibration = true;
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# endif
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if (needCalibration)
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{
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std::atomic_signal_fence( std::memory_order_acq_rel );
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const auto t0 = std::chrono::high_resolution_clock::now();
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const auto r0 = GetTime();
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std::atomic_signal_fence( std::memory_order_acq_rel );
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std::this_thread::sleep_for( std::chrono::milliseconds( 200 ) );
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std::atomic_signal_fence( std::memory_order_acq_rel );
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const auto t1 = std::chrono::high_resolution_clock::now();
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const auto r1 = GetTime();
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std::atomic_signal_fence( std::memory_order_acq_rel );
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const auto dt = std::chrono::duration_cast<std::chrono::nanoseconds>( t1 - t0 ).count();
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const auto dr = r1 - r0;
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m_timerMul = double( dt ) / double( dr );
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}
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#endif
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}
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@ -26,11 +26,11 @@
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# include <mach/mach_time.h>
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#endif
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#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 ) )
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#if ( defined _WIN32 || ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 ) || ( defined TARGET_OS_IOS && TARGET_OS_IOS == 1 ) )
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# define TRACY_HW_TIMER
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#endif
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#if !defined TRACY_HW_TIMER
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#if defined TRACY_TIMER_FALLBACK || !defined TRACY_HW_TIMER
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# include <chrono>
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#endif
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@ -67,6 +67,23 @@ TRACY_API uint32_t GetThreadHandle();
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TRACY_API bool ProfilerAvailable();
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TRACY_API int64_t GetFrequencyQpc();
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#if defined TRACY_TIMER_FALLBACK && defined TRACY_HW_TIMER && ( defined __i386 || defined _M_IX86 || defined __x86_64__ || defined _M_X64 )
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TRACY_API bool hardwareSupportsInvariantTSC(); // check, if we need fallback scenario
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#else
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# if defined TRACY_HW_TIMER
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tracy_force_inline bool hardwareSupportsInvariantTSC()
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{
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return true; // this is checked at startup
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}
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# else
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tracy_force_inline bool hardwareSupportsInvariantTSC()
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{
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return false;
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}
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# endif
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#endif
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struct SourceLocationData
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{
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const char* name;
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@ -166,25 +183,39 @@ public:
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{
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#ifdef TRACY_HW_TIMER
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# if defined TARGET_OS_IOS && TARGET_OS_IOS == 1
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return mach_absolute_time();
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if (hardwareSupportsInvariantTSC())
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{
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return mach_absolute_time();
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}
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# elif defined _WIN32
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# ifdef TRACY_TIMER_QPC
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return GetTimeQpc();
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# else
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return int64_t( __rdtsc() );
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if (hardwareSupportsInvariantTSC())
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{
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return int64_t( __rdtsc() );
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}
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# endif
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# elif defined __i386 || defined _M_IX86
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uint32_t eax, edx;
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asm volatile ( "rdtsc" : "=a" (eax), "=d" (edx) );
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return ( uint64_t( edx ) << 32 ) + uint64_t( eax );
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if (hardwareSupportsInvariantTSC())
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{
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uint32_t eax, edx;
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asm volatile ( "rdtsc" : "=a" (eax), "=d" (edx) );
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return ( uint64_t( edx ) << 32 ) + uint64_t( eax );
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}
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# elif defined __x86_64__ || defined _M_X64
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uint64_t rax, rdx;
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asm volatile ( "rdtsc" : "=a" (rax), "=d" (rdx) );
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return (int64_t)(( rdx << 32 ) + rax);
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if (hardwareSupportsInvariantTSC())
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{
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uint64_t rax, rdx;
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asm volatile ( "rdtsc" : "=a" (rax), "=d" (rdx) );
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return (int64_t)(( rdx << 32 ) + rax);
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}
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# else
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# error "TRACY_HW_TIMER detection logic needs fixing"
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# endif
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#else
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#endif
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#if !defined TRACY_HW_TIMER || defined TRACY_TIMER_FALLBACK
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# if defined __linux__ && defined CLOCK_MONOTONIC_RAW
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struct timespec ts;
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clock_gettime( CLOCK_MONOTONIC_RAW, &ts );
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@ -193,6 +224,8 @@ public:
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return std::chrono::duration_cast<std::chrono::nanoseconds>( std::chrono::high_resolution_clock::now().time_since_epoch() ).count();
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# endif
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#endif
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return 0; // unreacheble branch
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}
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tracy_force_inline uint32_t GetNextZoneId()
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