[mpich-discuss] Program execution time:

[Micha Feigin]

On Sat, 15 May 2010 17:22:38 +0500
sankar s <keanesankar at gmail.com> wrote:

> Hi,
> 
> I have developed a simulation program in c using MPI. I am using
> gettickcount() function to find time taken in each core for executing this
> program in a core2 duo processor.
> 
> start=gettickcount() ;
> {
> code
> }
> end=gettickcount();
> time=end-start();
> 
> Its working properly but each time when I ran this code, its giving
> different execution times. its happening for my sequential code without MPI
> also. I am using Windows vista, DELL core 2 duo processor.
> 
>    Is there any way to measure exact execution time in c.Which will not
> change every time, when I run the program.?
> 
> 
> 
> Thanks

How different are the timings?

They are expected to be somewhat different as this is a multi-process
system, so your application is time sharing the CPU.