Re: [Gems-users] How to replicate simulation runs exactly

["Fuad Tabba" <fuad@xxxxxxxxxxxxxxxxx>]

Hi Dan (and everyone else),

Setting the g_RANDOM_SEED to 1 doesn't seem to be working. Two runs of the simulation produce different timing results. I also searched through the code, srandom is always initialized by g_RANDOM_SEED, and I didn't find an instace where setting g_RANDOM_SEED to 0 would result in passing time(NULL) instead of the seed provided... I've also attached gdb to simics/ruby before loading ruby, with breakpoints set on srandom,srand,random and rand to verify that srandom does indeed get the value I've set for g_RANDOM_SEED, and that it gets called before any calls to random, and my assumptions seem to be correct.

I am using GEMS2.1/ATMTP btw...

Any other ideas or suggestions?

Thanks.

Cheers,
/fuad

On Thu, Oct 30, 2008 at 8:21 AM, Fuad Tabba <fuad@xxxxxxxxxxxxxxxxx> wrote:

Thanks Dan.

Cheers,
/fuad

On Thu, Oct 30, 2008 at 4:49 AM, Dan Gibson <degibson@xxxxxxxx> wrote:

RANDOM_SEED = 0 forces a random seed based on the current value of time(NULL). Most PRNGs cannot handle 0 as a seed. Set RANDOM_SEED to non-zero.

Regards,
Dan

On Tue, Oct 28, 2008 at 10:31 PM, Fuad Tabba <fuad@xxxxxxxxxxxxxxxxx> wrote:

Hi,

Running GEMS/ATMTP, if I run the exact same experiment twice, I get slightly different results in timing. Is it possible to replicate the experiments exactly?

RANDOMIZATION is set to false and RANDOM_SEED is set to 0; but still, I cannot replicate the exact timing...

Is there a way of doing this? Thanks.

Cheers,
/fuad

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