Monday, April 15, 2013

Calculating Clock Cycles Of A C Program - C And C++ | Dream.In ...


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    2 Replies - 27 Views - Last Post: Today, 08:50 AM Rate Topic: -----

    #1 brettlee54 ?Icon User is offline

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    Posted Today, 08:21 AM

    I have been working on a project to estimate the energy consumed by an application in a cluster. I have been using a tool called "perf" in linux systems to calculate the clock cycles. I have tried using asm_volatile assembly code in aswell to calculate the cycles.
    But how do i manually calculate it? Let's take a simple "hello World" program for example.
    
 #include<stdio.h> 
    
 main{ 
    
 printf("\n hello world"); } 

    perf gave me a count close to 8lakh cycles.


    Is This A Good Question/Topic? 0

    Replies To: calculating clock cycles of a c program

    #2 jimblumberg ?Icon User is online

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    Re: calculating clock cycles of a c program

    Posted Today, 08:47 AM

    So what is your actual question? What makes you think this is a C/C++ question?

    Maybe you need to investigate what perf is actually doing. Since it is on Linux you can probably find the source code on the Internet.

    Jim


    #3 brettlee54 ?Icon User is offline

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    Re: calculating clock cycles of a c program

    Posted Today, 08:50 AM

    View Postjimblumberg, on 14 April 2013 - 08:47 AM, said:

    So what is your actual question? What makes you think this is a C/C++ question?

    Maybe you need to investigate what perf is actually doing. Since it is on Linux you can probably find the source code on the Internet.

    Jim


    Beause I used _asm_volatile to use a TSC (time stamp counter). My question is, is there any other accurate way of measuring clock cycles in C?? Or is there a manual way of calculating it for a simple "Hello World" program??
    Thank you.

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