Top "Rdtsc" questions

How to get the CPU cycle count in x86_64 from C++?

I saw this post on SO which contains C code to get the latest CPU Cycle count: CPU Cycle count …

c++ c performance x86 rdtsc

How to count clock cycles with RDTSC in GCC x86?

With Visual Studio I can read the clock cycle count from the processor as shown below. How do I do …

c++ c gcc x86 rdtsc

Getting cpu cycles using RDTSC - why does the value of RDTSC always increase?

I want to get the CPU cycles at a specific point. I use this function at that point: static __inline__ …

linux assembly x86 cpu-usage rdtsc

Difference between rdtscp, rdtsc : memory and cpuid / rdtsc?

Assume we're trying to use the tsc for performance monitoring and we we want to prevent instruction reordering. These are …

c++ c performance assembly rdtsc

rdtsc accuracy across CPU cores

I am sending network packets from one thread and receiving replies on a 2nd thread that runs on a different …

linux multicore rdtsc

CPU Cycle count based profiling in C/C++ Linux x86_64

I am using the following code to profile my operations to optimize on cpu cycles taken in my functions. static __…

c profiling x86-64 cpu rdtsc

Negative clock cycle measurements with back-to-back rdtsc?

I am writing a C code for measuring the number of clock cycles needed to acquire a semaphore. I am …

c x86-64 inline-assembly overhead rdtsc

RDTSC on VisualStudio 2010 Express - C++ does not support default-int

I tried to test rdtsc on VisualStudio 2010. Heres my code: #include <iostream> #include <windows.h> #include &…

c++ visual-studio-2010 visual-studio rdtsc

Calculate system time using rdtsc

Suppose all the cores in my CPU have same frequency, technically I can synchronize system time and time stamp counter …

c++ assembly time rdtsc

rdtsc, too many cycles

#include <stdio.h> static inline unsigned long long tick() { unsigned long long d; __asm__ __volatile__ ("rdtsc" : "=A" (d) ); …

c assembly x86 rdtsc