On 11 Jul 26, Daniel Lezcano wrote:
> This little program takes the cpu # as parameter, set the affinity and
> renice itself to the maximum priority. It increments a counter during
> one second, display the coutner's value and exit.
>
> Signed-off-by: Daniel Lezcano <daniel.lezc...@linaro.org>
Have you looked at the cpuburn program?
> ---
> utils/cpucycle.c | 108
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 108 insertions(+), 0 deletions(-)
> create mode 100644 utils/cpucycle.c
>
> diff --git a/utils/cpucycle.c b/utils/cpucycle.c
> new file mode 100644
> index 0000000..dc4a7d7
> --- /dev/null
> +++ b/utils/cpucycle.c
> @@ -0,0 +1,108 @@
> +/*******************************************************************************
> + * PM-QA validation test suite for the power management on ARM
> + *
> + * Copyright (C) 2011, Linaro Limited.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version 2
> + * of the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
> 02110-1301, USA.
> + *
> + * Contributors:
> + * Daniel Lezcano <daniel.lezc...@linaro.org> (IBM Corporation)
> + * - initial API and implementation
> + *
> +
> *******************************************************************************/
> +
> +#define _GNU_SOURCE
> +#include <sched.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <stdbool.h>
> +#include <signal.h>
> +#include <unistd.h>
> +#include <regex.h>
> +#include <sys/types.h>
> +#include <sys/time.h>
> +#include <sys/resource.h>
> +
> +static bool intr;
> +
> +void sigalarm(int sig)
> +{
> + intr = true;
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + regex_t reg;
> + const char *regex = "cpu[0-9].*";
> + char **aargv = NULL;
> + regmatch_t m[1];
> + cpu_set_t cpuset;
> + long counter = 0;
> + int i;
> +
> + if (argc == 1) {
> + fprintf(stderr, "%s <cpuN> [cpuM] ... \n", argv[0]);
> + return 1;
> + }
> +
> + aargv = &argv[1];
> +
> + if (regcomp(®, regex, 0)) {
> + fprintf(stderr, "failed to compile the regex\n");
> + return 1;
> + }
> +
> + CPU_ZERO(&cpuset);
> +
> + for (i = 0; i < (argc - 1); i++) {
> +
> + char *aux;
> + int cpu;
> +
> + if (regexec(®, aargv[i], 1, m, 0)) {
> + fprintf(stderr, "'%s' parameter not recognized, " \
> + "should be cpu[0-9]\n", aargv[i]);
> + return 1;
> + }
> +
> + aux = aargv[i] + 3;
> + cpu = atoi(aux);
> +
> + CPU_SET(cpu, &cpuset);
> + }
> +
> + if (sched_setaffinity(0, sizeof(cpuset), &cpuset)) {
> + perror("sched_setaffinity");
> + return 1;
> + }
> +
> + if (setpriority(PRIO_PROCESS, 0, -20) < 0) {
> + perror("setpriority");
> + return 1;
> + }
> +
> + signal(SIGALRM, sigalarm);
> +
> + /* warmup */
> + alarm(1);
> + for (counter = 0, intr = false; !intr ; counter++);
> +
> + alarm(1);
> + for (counter = 0, intr = false; !intr ; counter++);
> +
> + printf("%ld\n", counter);
> +
> + return 0;
> +}
> --
> 1.7.4.1
>
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