Re: [PATCH] pi_stress: limit the number of inversion groups to the number of online cores

[John Kacur <jkacur@redhat.com>]

On Tue, 21 Jul 2020, Clark Williams wrote:

> Each inversion group is three SCHED_FIFO threads, so the chances of more groups
> than online cores actually getting to run is very slim. Limit the number of
> groups requested to be <= the number of online cpus.
> 
> Signed-off-by: Clark Williams <williams@redhat.com>
> ---
>  src/pi_tests/pi_stress.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/src/pi_tests/pi_stress.c b/src/pi_tests/pi_stress.c
> index 0ed844c636cd..ce446d4ea037 100644
> --- a/src/pi_tests/pi_stress.c
> +++ b/src/pi_tests/pi_stress.c
> @@ -1327,6 +1327,12 @@ void process_command_line(int argc, char **argv)
>  			break;
>  		case 'g':
>  			ngroups = strtol(optarg, NULL, 10);
> +			if (ngroups > num_processors) {
> +				pi_error("the number of groups cannot exceed "
> +					 "the number of online processors (%d)\n",
> +					 num_processors);
> +				exit(-1);
> +			}
>  			pi_info("number of groups set to %d\n", ngroups);
>  			break;
>  		case 'r':
> -- 
> 2.26.2
> 
> 
Signed-off-by: John Kacur <jkacur@redhat.com>