Re: [igt-dev] [PATCH i-g-t] benchmarks/gem_wsim: Randomise random seed

["Ser, Simon" <simon.ser@intel.com>]

On Thu, 2019-05-16 at 19:58 +0100, Chris Wilson wrote:
> To avoid hitting the same rut on each benchmark run, start with a new
> random seed. To allow hitting the same rut again, let it be specified
> by the user.
> 
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> ---
>  benchmarks/gem_wsim.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/benchmarks/gem_wsim.c b/benchmarks/gem_wsim.c
> index 48568ce40..cf2a44746 100644
> --- a/benchmarks/gem_wsim.c
> +++ b/benchmarks/gem_wsim.c
> @@ -2282,8 +2282,9 @@ int main(int argc, char **argv)
>  	igt_require(fd);
>  
>  	init_clocks();
> +	srand(time(NULL));

Maybe the seed used for the run should be printed to stderr, so that's
it's easy to re-run a failure?

> -	while ((c = getopt(argc, argv, "hqv2RSHxGdc:n:r:w:W:a:t:b:p:")) != -1) {
> +	while ((c = getopt(argc, argv, "hqv2RSHxGdc:n:r:w:W:a:t:b:p:s:")) != -1) {
>  		switch (c) {
>  		case 'W':
>  			if (master_workload >= 0) {
> @@ -2300,6 +2301,9 @@ int main(int argc, char **argv)
>  		case 'p':
>  			prio = atoi(optarg);
>  			break;
> +		case 's':
> +			srand(atoi(optarg));
> +			break;
>  		case 'a':
>  			if (append_workload_arg) {
>  				if (verbose)
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