¡@
c++ Programming Glossary: rdtschttp://stackoverflow.com/questions/13772567/get-cpu-cycle-count inline uint64_t get_cycles uint64_t t __asm volatile rdtsc A t return t EDIT3 From above code I get the error error C2400.. stdint.h Windows #ifdef _WIN32 #include intrin.h uint64_t rdtsc return __rdtsc Linux GCC #else uint64_t rdtsc unsigned int lo.. #ifdef _WIN32 #include intrin.h uint64_t rdtsc return __rdtsc Linux GCC #else uint64_t rdtsc unsigned int lo hi __asm__ __volatile__..
C++ high precision time measurement in Windows http://stackoverflow.com/questions/1825720/c-high-precision-time-measurement-in-windows core the code is executing on. See this MSDN article. rdtsc has the same problem This is not just a theoretical problem..
http://stackoverflow.com/questions/6432669/variance-in-rdtsc-overhead inline unsigned long long __attribute__ always_inline rdtsc64 unsigned int hi lo __asm__ __volatile__ xorl eax eax n t cpuid.. int hi lo __asm__ __volatile__ xorl eax eax n t cpuid n t rdtsc a lo d hi no inputs rbx rcx return unsigned long long hi 32ull.. long long hi 32ull unsigned long long lo unsigned int find_rdtsc_overhead const int trials 1000000 std vector unsigned long long..
Finding out the CPU clock frequency (per core, per processor) http://stackoverflow.com/questions/8351944/finding-out-the-cpu-clock-frequency-per-core-per-processor There's no portable way to get the processor frequency. rdtsc does NOT always give the correct frequency due to effects such.. frequency The easy way to get the CPU frequency is to call rdtsc twice with a fixed time duration in between. Then dividing out.. will give you the frequency. The problem is that rdtsc does not give the true frequency of the processor. Because real..
Microsecond resolution timestamps on Windows http://stackoverflow.com/questions/2414359/microsecond-resolution-timestamps-on-windows not always run at CPU speed. In fact it might try to avoid RDTSC especially on multi processor multi core systems it will use..
Sub-millisecond precision timing in C or C++ http://stackoverflow.com/questions/2904887/sub-millisecond-precision-timing-in-c-or-c . No memory allocation no sockets no mutexes nada. Use the RDTSC to spin in a while loop waiting for your target time to arrive... time. Sleep for this duration and then upon waking spin on RDTSC if you're on a single CPU... use QueryPerformanceCounter or..
http://stackoverflow.com/questions/6432669/variance-in-rdtsc-overhead in RDTSC overhead I'm constructing a micro benchmark to measure performance.. of the measurement code itself. I'm measuring with RDTSC and I'm using the following code to find the measurement overhead.. assembly intel rdtsc share improve this question RDTSC can return inconsistent results for a number of reasons On some..
QueryPerformanceCounter Status? http://stackoverflow.com/questions/7287663/queryperformancecounter-status TSC correctly synced between cores so the problems with RDTSC based timers are eliminated. The hot fix can be gotten from..
How to measure the time that a piece of code takes to execute? http://stackoverflow.com/questions/7497630/how-to-measure-the-time-that-a-piece-of-code-takes-to-execute gettimeofday is sufficient. If you want to get precise use RDTSC If you want to get really precise you'll want something like..
timespec equivalent for windows http://stackoverflow.com/questions/8583308/timespec-equivalent-for-windows don't work. Other possibilites for Windows might be RDTSC see the Wikipedia article. And HPET which isn't available with..
The implementation of random_device in VS2010? http://stackoverflow.com/questions/9549357/the-implementation-of-random-device-in-vs2010 integrity. High precision internal CPU counters such as RDTSC RDMSR RDPMC Low level system information Idle Process Time Io..
|