While testing Pythons time.clock() function on FreeBSD I've noticed it always returns the same value, around 0.156 The time.time() function works properly but I need a something with a slightly higher resolution. Does anyone the C function it's bound to and if there is an alternative high resolution timer? I'm not profiling so the Tim...
I'm writing a portable Socket class that supports timeouts for both sending and receiving... To implement these timeouts I'm using select().... But, I sometimes need to know how long I was blocked inside select() which of course on Linux I would implement by calling gettimeofday() before and after I call select() and then using timersub(...
Hi, Is there a more Object Oriented alternative to using gettimeofday() in C++ on linux? I like for instance to be able to write code similar to this: DateTime now = new DateTime; DateTime duration = new DateTime(2300, DateTime.MILLISECONDS) DateTime deadline = now + duration; while(now < deadline){ DoSomething(); delete now;...
Hi, Could someone please help me to use gettimeofday() function with Visual Studio C++ 2008 on Windows XP? here is a code that I found somewhere on the net: #include < time.h > #include <windows.h> #if defined(_MSC_VER) || defined(_MSC_EXTENSIONS) #define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64 #else #define DELTA_EPOCH_I...
I want to measure the running times of selected loops in a C program so as to see what percentage of the total time for executing the program (on linux) is spent in these loops. I should be able to specify the loops for which the performance should be measured. I have tried out several tools (vtune, hpctoolkit, oprofile) in the last few ...
I have an experimental library whose performance I'm trying to measure. To do this, I've written the following: struct timeval begin; gettimeofday(&begin, NULL); { // Experiment! } struct timeval end; gettimeofday(&end, NULL); // Print the time it took! std::cout << "Time: " << 100000 * (end.tv_sec - begin.tv_sec) + (end.tv_usec - ...
Update: fixed delta calculations in code, still the issue remains Folks, could you please explain why I'm getting very strange results from time to time using the the following code: #include <unistd.h> #include <sys/time.h> #include <stdio.h> int main() { struct timeval start, end; long mtime1, mtime2, diff; while(1) { g...
A simple C program which uses gettimeofday() works fine when compiled without any flags ( gcc-4.5.1) but doesn't give output when compiled with the flag -mno-sse. #include <stdio.h> #include <stdlib.h> int main() { struct timeval s,e; float time; int i; gettimeofday(&s, NULL); for( i=0; i< 10000; i++); gettimeof...
I do not really wish to profile because I was wanting to do many different small benchmarks on different simple functions. For the life of me I cannot find a way to record the amount of milliseconds in C++, I am using Linux by the way. Can you suggest the method to get the system clock in milliseconds (I may settle with seconds if I can...
My process runs multiple instances (processes) and multiple threads and all of them write to the same database. As soon as the request is placed, a unique req id is generated for the record to be added to the proprietary db. Here are our limitations: It cannot be more than 9 char length, needs to have hhmmss as the first 6 chars. We deci...
Hi, i am measuring physical time between two events like this: #include <time.h> #include <sys/time.h> timeval wall_time0; timeval wall_time1; // start of period measurement gettimeofday( &wall_time0 , 0); ...stuff happening // end of period measurement gettimeofday( &wall_time1 , 0); return ( ( wall_time1.tv_sec - wall_time0.tv_...