Log CPU Usage in Visual Studio

Question

I want to log the CPU usage of my C program in Visual Studio. Using Performance Profile I am able to view the graphical representation of the CPU usage of my C program. But what should I do or what code should I add to my existing code so that I can log the CPU usage of my program for each second in a text or an excel file.

Answer 1

Probably the easiest thing to do would be to create a thread, that just uses GetProcessTimes to get the process' current CPU usage, write it out to the file, sleep a second, and repeat. You can then (for example) set a signal to tell it to exit:

FILETIME creation, done, kernel, user;
int PID;

std::atomic<bool> finished = false;

std::thread logger([&] {
    printf("seconds\n");
    while (!finished) {
        GetProcessTimes(GetCurrentProcess(), &creation, &done, &kernel, &user);

        SYSTEMTIME used_k, used_u;

        FileTimeToSystemTime(&kernel, &used_k);
        FileTimeToSystemTime(&user, &used_u);

        DWORD milliseconds = used_k.wMilliseconds + used_u.wMilliseconds;
        DWORD seconds = used_k.wSecond + used_u.wSecond;

        printf("%d.%3.3d\n", seconds, milliseconds);
        Sleep(1000);
    }
});

// Do work to be timed/logged here

finished = true;
logger.join();