On recent x86, RDTSC returns some pseudo-counter that measures time instead of clock cycles. Given this, how do I measure actual clock cycles for the ...
On recent x86, RDTSC returns some pseudo-counter that measures time instead of clock cycles. Given this, how do I measure actual clock cycles for the ...
I have a code like that: In release builds, this prints garbage like “38 cycles” because VC++ compiler reordered my code: What’s the best way to ...
In a busy loop, some codes contiguously get the current time twice and count their time interval. The time interval is supposed to be small, since the ...
I am trying to use the following inline assembly in C to read the high word (%edx) of Time Stamp Counter for time measurement: Unfortunately, the c ...
I'm confused whether rdtscp monotonically increments in a multi-core environment. According to the document: __rdtscp, rdtscp seems a processor-based ...
I am trying to reproduce How to Benchmark Code Execution Times on Intel IA-32 and IA-64 Instruction Set Architectures White Paper. This white paper pr ...
I'm trying to time a subroutine using rdtscp. This is my procedure: if LOOP_SIZE is small enough, I get consistent and expected results. However, w ...
I work on programming language profiler and I am looking for a timer solution for Windows with better than 100 ns resolution. QueryPerformanceCoun ...
I used to benchmark Linux System Calls with rdtsc to get the counter difference before and after the system call. I interpreted the result as wall clo ...
i am attempting to use rdtsc for a timer, but both the eax and edx registers either remain empty or they form a number very different from the one giv ...
I have 4 test functions - foo1(), foo2(), foo3() and foo4(). For measurements I use following program: And so on, for foo3() and foo4(). I have t ...
Some times I need a proper way to measure performance at nanosecond from my user space application in order to include the syscall delays in my measur ...
I wanted to benchmark the time needed to do a single addition on my Skylake (i5-6500) CPU. C is low-level enough for me, so I wrote the following code ...
As far as I know, the main difference in runtime ordering in a processor with respect to rdtsc and rdtscp instruction is that whether the execution wa ...
I wrote a basic code to find out the amount of clock cycles taken by nop. We know nop takes one clock cycle. But the output is not 1. It is someti ...
I have two processes in C++ (these are not parent and child processes). Each has been pinned to a specific core using taskset. So, for instance, proce ...
I am timing multiple NOP instructions and a single NOP instruction in C++, using rdtsc. However, I don't get an increase in the number of cycles it ta ...
I'm writing a program that measures the performance of matrix multiplication with rdtsc(), Read Time Stamp Counter. However, when I combined the matr ...
I'm trying to count, using rdtsc, how many cycles it takes write something using sys_write. I was able to test the printf and scanf functions. They wo ...
Can different processes run RDTSC at the same time? Or is this a resource that only one core can operate on at the same time? TSC is in every core (at ...