* [Xenomai] xenomai-2.6.3 with freescale imx6 kernel threads binding cpu
@ 2014-01-16 9:40 嵌入式工程师
0 siblings, 0 replies; 4+ messages in thread
From: 嵌入式工程师 @ 2014-01-16 9:40 UTC (permalink / raw
To: xenomai@xenomai.org, Gilles Chanteperdrix
I use xenomai-2.6.3 with freescale imx6 kernel-3.0.35 threads binding cpu。
rt_task_create(&t1, "task1", 4096, 88, T_FPU|T_CPU(0)rt_task_create(&t1, "task1", 4096, 88, T_FPU|T_CPU(1));
But will randomly select binding cpu, not what I want cpu1,what is wrong？
thanks!
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Xenomai] xenomai-2.6.3 with freescale imx6 kernel threads binding cpu
@ 2014-01-16 9:45 嵌入式工程师
2014-01-16 22:33 ` Gilles Chanteperdrix
0 siblings, 1 reply; 4+ messages in thread
From: 嵌入式工程师 @ 2014-01-16 9:45 UTC (permalink / raw
To: Gilles Chanteperdrix, xenomai@xenomai.org
Just the wrong message，below is my question。
I use xenomai-2.6.3 with freescale imx6 kernel-3.0.35 threads binding cpu。
rt_task_create(&t1, "task1", 4096, 88, T_FPU|T_CPU(1));
But will randomly select binding cpu, not what I want cpu1,what is wrong？
thanks!
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Xenomai] xenomai-2.6.3 with freescale imx6 kernel threads binding cpu
2014-01-16 9:45 [Xenomai] xenomai-2.6.3 with freescale imx6 kernel threads binding cpu 嵌入式工程师
@ 2014-01-16 22:33 ` Gilles Chanteperdrix
2014-01-16 22:58 ` Gilles Chanteperdrix
0 siblings, 1 reply; 4+ messages in thread
From: Gilles Chanteperdrix @ 2014-01-16 22:33 UTC (permalink / raw
To: 嵌入式工程师; +Cc: xenomai@xenomai.org
On 01/16/2014 10:45 AM, 嵌入式工程师 wrote:
>
>
> Just the wrong message，below is my question。
>
>
> I use xenomai-2.6.3 with freescale imx6 kernel-3.0.35 threads binding cpu。
> rt_task_create(&t1, "task1", 4096, 88, T_FPU|T_CPU(1));
> But will randomly select binding cpu, not what I want cpu1,what is wrong？
> thanks!
Hi,
I have been trying to reproduce this issue with the program which
follows, and was unable to do it. Could you try to run this program on
your system? Or post a program, reduced to its simplest possible form,
demonstrating the issue you observe?
Regards.
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <sched.h>
#include <unistd.h>
#include <native/task.h>
void body(void *cookie)
{
long target_cpu = (long)cookie;
long real_cpu = sched_getcpu();
if (real_cpu < 0) {
perror("sched_getcpu");
exit(EXIT_FAILURE);
}
if (real_cpu != target_cpu) {
fprintf(stderr, "Real cpu is %ld instead of %ld\n",
real_cpu, target_cpu);
exit(EXIT_FAILURE);
}
}
int main(void)
{
int nrcpus = sysconf(_SC_NPROCESSORS_ONLN);
double divider = 1 / sqrt(RAND_MAX);
unsigned i = 0;
if (nrcpus < 0) {
perror("sysconf(_SC_NPROCESSORS_ONLN)");
return EXIT_FAILURE;
}
srandom(time(NULL));
for(;;) {
char name[80];
long target_cpu;
cpu_set_t cpu_set;
RT_TASK task;
long mycpu;
int err;
++i;
target_cpu = (int)(random() * divider) % nrcpus;
mycpu = (int)(random() * divider) % nrcpus;
CPU_ZERO(&cpu_set);
CPU_SET(mycpu, &cpu_set);
err = sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
if (err < 0) {
perror("sched_setaffinity");
return EXIT_FAILURE;
}
fprintf(stderr, "%09d: mine: %ld, target: %ld\n",
i, mycpu, target_cpu);
snprintf(name, sizeof(name), "task%d", i);
err = rt_task_create(&task, name, 65536, 88,
T_FPU | T_CPU(target_cpu) | T_JOINABLE);
if (err < 0) {
fprintf(stderr, "rt_task_create: %d, %d\n", err, i);
return EXIT_FAILURE;
}
err = rt_task_start(&task, body, (void *)target_cpu);
if (err < 0) {
fprintf(stderr, "rt_task_start: %d\n", err);
return EXIT_FAILURE;
}
err = rt_task_join(&task);
if (err < 0) {
fprintf(stderr, "rt_task_join: %d\n", err);
return EXIT_FAILURE;
}
}
}
--
Gilles.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Xenomai] xenomai-2.6.3 with freescale imx6 kernel threads binding cpu
2014-01-16 22:33 ` Gilles Chanteperdrix
@ 2014-01-16 22:58 ` Gilles Chanteperdrix
0 siblings, 0 replies; 4+ messages in thread
From: Gilles Chanteperdrix @ 2014-01-16 22:58 UTC (permalink / raw
To: 嵌入式工程师; +Cc: xenomai@xenomai.org
On 01/16/2014 11:33 PM, Gilles Chanteperdrix wrote:
> On 01/16/2014 10:45 AM, 嵌入式工程师 wrote:
>>
>>
>> Just the wrong message，below is my question。
>>
>>
>> I use xenomai-2.6.3 with freescale imx6 kernel-3.0.35 threads binding cpu。
>> rt_task_create(&t1, "task1", 4096, 88, T_FPU|T_CPU(1));
>> But will randomly select binding cpu, not what I want cpu1,what is wrong？
>> thanks!
>
> Hi,
>
> I have been trying to reproduce this issue with the program which
> follows,
Or better:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <sched.h>
#include <unistd.h>
#include <native/task.h>
void body(void *cookie)
{
long target_cpu = (long)cookie;
long real_cpu = sched_getcpu();
if (real_cpu < 0) {
perror("sched_getcpu");
exit(EXIT_FAILURE);
}
if (real_cpu != target_cpu) {
fprintf(stderr, "Real cpu is %ld instead of %ld\n",
real_cpu, target_cpu);
exit(EXIT_FAILURE);
}
}
int main(void)
{
int nrcpus = sysconf(_SC_NPROCESSORS_ONLN);
double divider = 1 / sqrt(RAND_MAX);
unsigned i = 0;
if (nrcpus < 0) {
perror("sysconf(_SC_NPROCESSORS_ONLN)");
return EXIT_FAILURE;
}
srandom(time(NULL));
for(;;) {
char name[80];
long target_cpu;
cpu_set_t cpu_set;
RT_TASK task;
long aff;
int err;
++i;
target_cpu = (int)(random() * divider) % nrcpus;
aff = 1 + (int)(random() * divider) % ((1 << nrcpus) - 1);
CPU_ZERO(&cpu_set);
for (err = 0; err < nrcpus; err++)
if (aff & (1 << err))
CPU_SET(err, &cpu_set);
err = sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
if (err < 0) {
perror("sched_setaffinity");
return EXIT_FAILURE;
}
fprintf(stderr, "%09d: affinity: %ld, target: %ld\n",
i, aff, target_cpu);
snprintf(name, sizeof(name), "task%d", i);
err = rt_task_create(&task, name, 65536, 88,
T_FPU | T_CPU(target_cpu) | T_JOINABLE);
if (err < 0) {
fprintf(stderr, "rt_task_create: %d, %d\n", err, i);
return EXIT_FAILURE;
}
err = rt_task_start(&task, body, (void *)target_cpu);
if (err < 0) {
fprintf(stderr, "rt_task_start: %d\n", err);
return EXIT_FAILURE;
}
err = rt_task_join(&task);
if (err < 0) {
fprintf(stderr, "rt_task_join: %d\n", err);
return EXIT_FAILURE;
}
}
}
--
Gilles.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-01-16 22:58 UTC | newest]
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2014-01-16 9:45 [Xenomai] xenomai-2.6.3 with freescale imx6 kernel threads binding cpu 嵌入式工程师
2014-01-16 22:33 ` Gilles Chanteperdrix
2014-01-16 22:58 ` Gilles Chanteperdrix
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2014-01-16 9:40 嵌入式工程师
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