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[Help-gsl] random number sequence

From: Sergey Mkrtchyan
Subject: [Help-gsl] random number sequence
Date: Mon, 19 May 2008 16:58:08 -0400

Hi List,

I've bumped into really weird problem.

I have a piece of code which looks like...

        const gsl_rng_type *T;
        gsl_rng *r;


        gsl_rng_default_seed = rand()/(((double)RAND_MAX + 1)/10000000);

        T = gsl_rng_default;
        r = gsl_rng_alloc(T);


for(steps = 1; steps <= number_of_eq_steps; steps++){
                        rand_monomer_number = 1 + gsl_rng_uniform_int(r, N);

                        printf("random number = %lu\n", rand_monomer_number);

It works perfectly, but the problem is, that if I ran the program very
quickly one after another(or if two separate instances start at the
same time) it gives me the same sequence of random numbers, but if I
delay running the same thing for very little it gives different

I have to do some averaging, and I submit the same job on the cluster
1000 times, and usually they start running group by group so I end up
having the same results for every 10 or so jobs.

Any help is highly appreciated, I'm kind of stuck with this and
nothing comes to my mind.


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