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.lezcano@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.lezcano@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