diff options
Diffstat (limited to 'indra/llcommon/llfasttimer_class.cpp')
| -rw-r--r-- | indra/llcommon/llfasttimer_class.cpp | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/indra/llcommon/llfasttimer_class.cpp b/indra/llcommon/llfasttimer_class.cpp index bce87ada96..bd594b06cf 100644 --- a/indra/llcommon/llfasttimer_class.cpp +++ b/indra/llcommon/llfasttimer_class.cpp @@ -35,10 +35,13 @@ #include <boost/bind.hpp> + #if LL_WINDOWS +#include "lltimer.h" #elif LL_LINUX || LL_SOLARIS #include <sys/time.h> #include <sched.h> +#include "lltimer.h" #elif LL_DARWIN #include <sys/time.h> #include "lltimer.h" // get_clock_count() @@ -61,6 +64,8 @@ BOOL LLFastTimer::sMetricLog = FALSE; LLMutex* LLFastTimer::sLogLock = NULL; std::queue<LLSD> LLFastTimer::sLogQueue; +#define USE_RDTSC 0 + #if LL_LINUX || LL_SOLARIS U64 LLFastTimer::sClockResolution = 1000000000; // Nanosecond resolution #else @@ -234,10 +239,23 @@ U64 LLFastTimer::countsPerSecond() // counts per second for the *32-bit* timer #else // windows or x86-mac or x86-linux or x86-solaris U64 LLFastTimer::countsPerSecond() // counts per second for the *32-bit* timer { +#if USE_RDTSC || !LL_WINDOWS //getCPUFrequency returns MHz and sCPUClockFrequency wants to be in Hz static U64 sCPUClockFrequency = U64(LLProcessorInfo().getCPUFrequency()*1000000.0); // we drop the low-order byte in our timers, so report a lower frequency +#else + // If we're not using RDTSC, each fasttimer tick is just a performance counter tick. + // Not redefining the clock frequency itself (in llprocessor.cpp/calculate_cpu_frequency()) + // since that would change displayed MHz stats for CPUs + static bool firstcall = true; + static U64 sCPUClockFrequency; + if (firstcall) + { + QueryPerformanceFrequency((LARGE_INTEGER*)&sCPUClockFrequency); + firstcall = false; + } +#endif return sCPUClockFrequency >> 8; } #endif @@ -482,6 +500,19 @@ void LLFastTimer::NamedTimer::resetFrame() { if (sLog) { //output current frame counts to performance log + + static S32 call_count = 0; + if (call_count % 100 == 0) + { + llinfos << "countsPerSecond (32 bit): " << countsPerSecond() << llendl; + llinfos << "get_clock_count (64 bit): " << get_clock_count() << llendl; + llinfos << "LLProcessorInfo().getCPUFrequency() " << LLProcessorInfo().getCPUFrequency() << llendl; + llinfos << "getCPUClockCount32() " << getCPUClockCount32() << llendl; + llinfos << "getCPUClockCount64() " << getCPUClockCount64() << llendl; + llinfos << "elapsed sec " << ((F64)getCPUClockCount64())/((F64)LLProcessorInfo().getCPUFrequency()*1000000.0) << llendl; + } + call_count++; + F64 iclock_freq = 1000.0 / countsPerSecond(); // good place to calculate clock frequency F64 total_time = 0; @@ -763,3 +794,144 @@ LLFastTimer::LLFastTimer(LLFastTimer::FrameState* state) ////////////////////////////////////////////////////////////////////////////// +// +// Important note: These implementations must be FAST! +// + + +#if LL_WINDOWS +// +// Windows implementation of CPU clock +// + +// +// NOTE: put back in when we aren't using platform sdk anymore +// +// because MS has different signatures for these functions in winnt.h +// need to rename them to avoid conflicts +//#define _interlockedbittestandset _renamed_interlockedbittestandset +//#define _interlockedbittestandreset _renamed_interlockedbittestandreset +//#include <intrin.h> +//#undef _interlockedbittestandset +//#undef _interlockedbittestandreset + +//inline U32 LLFastTimer::getCPUClockCount32() +//{ +// U64 time_stamp = __rdtsc(); +// return (U32)(time_stamp >> 8); +//} +// +//// return full timer value, *not* shifted by 8 bits +//inline U64 LLFastTimer::getCPUClockCount64() +//{ +// return __rdtsc(); +//} + +// shift off lower 8 bits for lower resolution but longer term timing +// on 1Ghz machine, a 32-bit word will hold ~1000 seconds of timing +#if USE_RDTSC +U32 LLFastTimer::getCPUClockCount32() +{ + U32 ret_val; + __asm + { + _emit 0x0f + _emit 0x31 + shr eax,8 + shl edx,24 + or eax, edx + mov dword ptr [ret_val], eax + } + return ret_val; +} + +// return full timer value, *not* shifted by 8 bits +U64 LLFastTimer::getCPUClockCount64() +{ + U64 ret_val; + __asm + { + _emit 0x0f + _emit 0x31 + mov eax,eax + mov edx,edx + mov dword ptr [ret_val+4], edx + mov dword ptr [ret_val], eax + } + return ret_val; +} + +std::string LLFastTimer::sClockType = "rdtsc"; + +#else +//LL_COMMON_API U64 get_clock_count(); // in lltimer.cpp +// These use QueryPerformanceCounter, which is arguably fine and also works on amd architectures. +U32 LLFastTimer::getCPUClockCount32() +{ + return (U32)(get_clock_count()>>8); +} + +U64 LLFastTimer::getCPUClockCount64() +{ + return get_clock_count(); +} + +std::string LLFastTimer::sClockType = "QueryPerformanceCounter"; +#endif + +#endif + + +#if (LL_LINUX || LL_SOLARIS) && !(defined(__i386__) || defined(__amd64__)) +// +// Linux and Solaris implementation of CPU clock - non-x86. +// This is accurate but SLOW! Only use out of desperation. +// +// Try to use the MONOTONIC clock if available, this is a constant time counter +// with nanosecond resolution (but not necessarily accuracy) and attempts are +// made to synchronize this value between cores at kernel start. It should not +// be affected by CPU frequency. If not available use the REALTIME clock, but +// this may be affected by NTP adjustments or other user activity affecting +// the system time. +U64 LLFastTimer::getCPUClockCount64() +{ + struct timespec tp; + +#ifdef CLOCK_MONOTONIC // MONOTONIC supported at build-time? + if (-1 == clock_gettime(CLOCK_MONOTONIC,&tp)) // if MONOTONIC isn't supported at runtime then ouch, try REALTIME +#endif + clock_gettime(CLOCK_REALTIME,&tp); + + return (tp.tv_sec*LLFastTimer::sClockResolution)+tp.tv_nsec; +} + +U32 LLFastTimer::getCPUClockCount32() +{ + return (U32)(LLFastTimer::getCPUClockCount64() >> 8); +} + +std::string LLFastTimer::sClockType = "clock_gettime"; + +#endif // (LL_LINUX || LL_SOLARIS) && !(defined(__i386__) || defined(__amd64__)) + + +#if (LL_LINUX || LL_SOLARIS || LL_DARWIN) && (defined(__i386__) || defined(__amd64__)) +// +// Mac+Linux+Solaris FAST x86 implementation of CPU clock +U32 LLFastTimer::getCPUClockCount32() +{ + U64 x; + __asm__ volatile (".byte 0x0f, 0x31": "=A"(x)); + return (U32)(x >> 8); +} + +U64 LLFastTimer::getCPUClockCount64() +{ + U64 x; + __asm__ volatile (".byte 0x0f, 0x31": "=A"(x)); + return x; +} + +std::string LLFastTimer::sClockType = "rdtsc"; +#endif + |