CPU相似性掩码(将线程放入不同的CPU)
我有4个线程,并且尝试将线程1设置为在CPU 1上运行,线程2在CPU
2上运行,等等。但是,当我在下面运行代码时,亲和力掩码返回正确的值,但是当我执行sched_getcpu()在线程上,它们都返回它们正在CPU 4上运行。
有人知道我的问题在这里吗?
提前致谢!
#define _GNU_SOURCE#include <stdio.h>
#include <pthread.h>
#include <stdlib.h>
#include <sched.h>
#include <errno.h>
void *pthread_Message(char *message)
{
printf("%s is running on CPU %d\n", message, sched_getcpu());
}
int main()
{
pthread_t thread1, thread2, thread3, thread4;
pthread_t threadArray[4];
cpu_set_t cpu1, cpu2, cpu3, cpu4;
char *thread1Msg = "Thread 1";
char *thread2Msg = "Thread 2";
char *thread3Msg = "Thread 3";
char *thread4Msg = "Thread 4";
int thread1Create, thread2Create, thread3Create, thread4Create, i, temp;
CPU_ZERO(&cpu1);
CPU_SET(1, &cpu1);
temp = pthread_setaffinity_np(thread1, sizeof(cpu_set_t), &cpu1);
printf("Set returned by pthread_getaffinity_np() contained:\n");
for (i = 0; i < CPU_SETSIZE; i++)
if (CPU_ISSET(i, &cpu1))
printf("CPU1: CPU %d\n", i);
CPU_ZERO(&cpu2);
CPU_SET(2, &cpu2);
temp = pthread_setaffinity_np(thread2, sizeof(cpu_set_t), &cpu2);
for (i = 0; i < CPU_SETSIZE; i++)
if (CPU_ISSET(i, &cpu2))
printf("CPU2: CPU %d\n", i);
CPU_ZERO(&cpu3);
CPU_SET(3, &cpu3);
temp = pthread_setaffinity_np(thread3, sizeof(cpu_set_t), &cpu3);
for (i = 0; i < CPU_SETSIZE; i++)
if (CPU_ISSET(i, &cpu3))
printf("CPU3: CPU %d\n", i);
CPU_ZERO(&cpu4);
CPU_SET(4, &cpu4);
temp = pthread_setaffinity_np(thread4, sizeof(cpu_set_t), &cpu4);
for (i = 0; i < CPU_SETSIZE; i++)
if (CPU_ISSET(i, &cpu4))
printf("CPU4: CPU %d\n", i);
thread1Create = pthread_create(&thread1, NULL, (void *)pthread_Message, thread1Msg);
thread2Create = pthread_create(&thread2, NULL, (void *)pthread_Message, thread2Msg);
thread3Create = pthread_create(&thread3, NULL, (void *)pthread_Message, thread3Msg);
thread4Create = pthread_create(&thread4, NULL, (void *)pthread_Message, thread4Msg);
pthread_join(thread1, NULL);
pthread_join(thread2, NULL);
pthread_join(thread3, NULL);
pthread_join(thread4, NULL);
return 0;
}
回答:
您正在尝试设置未初始化的线程的相似性。
编辑:好的,让我给您更多信息:
不要混合使用线程句柄(存储在pthread_t变量中的东西)和它们代表的内容(在某个地方运行的执行线程)。您试图做的是使用需要线程对象的API在启动之前设置线程的属性。碰巧pthread_create会创建对象并同时开始执行,因此尝试使用pthread_setaffinity_np
不是正确的方法(如果要
更改 当前正在运行的线程的相似性,这将非常有用)。
但是… pthread_create
具有一个属性参数(您正在向其传递NULL)。这将存储有关如何创建线程的信息。
亲和力是您可以通过该参数设置的属性之一。请参阅手册页文档pthread_attr_init
,pthread_attr_setaffinity_np
以了解其精确性
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