Re: using the correct tool to time my parallel program

[Ingvald Gjesdal <inggjesd@start.no>]

You can use the return value from times(), which returns the number of
clock ticks since system boot

Ingvald

Mark Farnell wrote:
> I have a parallel program, which calls some message passing functions
> which block.  Then I attempted to use times() (with struct tms) to
> time the program.
> 
> the struct tms gives me the "program time" and the "system time" as
> well as the child process time (if any).  However does it also include
> the time spent when my program is blocked (i.e. network time).
> 
> This is important because although I use gprof to separate the CPU
> time spent by my program vs libraries, when I calculate the total time
> spent, I really need to include the time spent waiting for message
> from network (network time).
> 
> Therefore is times() really appropriate for my purpose?  If not, what
> other functions can I use instead? (such as gettimeofday?)
> 
> Thanks!
> 
> Mark
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Ingvald Gjesdal
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