Re: [Caml-list] Multiplication of matrix in C and OCaml

[Brian Hurt <bhurt@janestcapital.com>]

>I'd feel better if the code is benchmarked in a way
>that the result of the multiplication is output to a file and to
>subtract the constant contribution of that to the run time that the
>time is measured for various problem sizes (number of matrices). 
>

For the C side, I recommend using clock() to time the runs.  This also 
factors out the cost of creating the random matricies.  Basically, you 
just do:

#include <time.h>

...
    {
        clock_t start, stop;
        ...
        start = clock();
        /* stuff to time here */
        stop = clock();
        printf("The amount of time taken = %f seconds\n", 
((double)(stop-start))/((double) CLOCKS_PER_SEC));
        /* write result to file */
    }

In Ocaml, Unix.gettimeofday can be used similiarly:

    let start = Unix.gettimeofday() in
    (* stuff to time here *)
    let stop = Unix.gettimeofday() in
    Printf.printf "The amount of time taken = %f seconds\n" (stop -. start);
     (* write results to file *)

Brian