cpu-time

I want to run some benchmarks on a C++ algorithm and want to get the CPU time it takes, depending on inputs. I use Visual Studio 2012 on Windows 7. I already discovered one way to calculate the CPU time in Windows: How can I measure CPU time and wall clock time on both Linux/Windows? However, I use the system() command in my algorithm, which is not measured that way. So, how can I measure CPU time and include the times of my script calls via system()? I should add a small example. This is my get_cpu_time-function (From the link described above): double get_cpu_time(){ FILETIME a,b,c,d; if

If I had the following code clock_t t; t = clock(); //algorithm t = clock() - t; t would equal the number of ticks to run the program. Is this the same is CPU time? Are there any other ways to measure CPU time in C++? OS -- Debian GNU/Linux I am open to anything that will work. I am wanting to compare the CPU time of two algorithms. clock() is specified to measure CPU time however not all implementations do this. In particular Microsoft's implementation in VS does not count additional time when multiple threads are running, or count less time when the program's threads are sleeping/waiting.

What is the difference in CPU cycles (or, in essence, in 'speed') between x /= y; and #include <cmath> x = sqrt(y); EDIT: I know the operations aren't equivalent, I'm just arbitrarily proposing x /= y as a benchmark for x = sqrt(y) osgx The answer to your question depends on your target platform. Assuming you are using most common x86 cpus, I can give you this link http://instlatx64.atw.hu/ This is a collection of measured instruction latency (How long will it take to CPU to get result after it has argument) and how they are pipelined for many x86 and x86_64 processors. If your target is not