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

[Tvrtko Ursulin]

On 16/05/2019 19:58, 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 at chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at 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));
>   
> -	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)
> 

Makes sense, just the help text missing.

I was initially confused at srand when I thought I used your 
hars_petruska library routines but then saw rand() feeds the seed into 
those.

Regards,

Tvrtko