RR-FIFO.sh

3.进程调度/note.md

@@ -18,4 +18,74 @@ cat /proc/sched_debug
 cat /proc/schedstat
 ```
 ![image](./record/pic/3-4.png)
-![image](./record/pic/3-5.png)
\ No newline at end of file
+![image](./record/pic/3-5.png)
+#### 3-6 ps –aux 查看进程状态
+```bash
+ps -aux
+```
+![image](./record/pic/3-6.png)
+* R:TASK_RUNNING  可执行状态,包括就绪和正在 CPU 上执行
+* S:TASK_INTERRUPTIBLE   可中断的睡眠状态,也是操作系统课程中所谓的阻塞状态
+* D:TASK_UNINTERRUPTIBLE 不可中断的睡眠状态
+* T:TASK_STOPPED 或 TASK_TRACED 暂停状态或跟踪状态
+* Z:TASK_DEAD(-EXIT_ZOMBIE) 退出状态,且成为僵尸进程
+* X:TASK_DEAD(-EXIT_DEAD)  退出状态,且进程即将被销毁
+#### 3-7&3-8 就绪与阻塞
+3-7 HelloWorld-loop-getchar 的运行输出
+![image](./record/pic/3-7.png)<br>
+3-8 用 ps 观察 HelloWorld-loop-getchar 进程调度状态变化
+```bash
+ps aux|grep HelloWorld-loop-getchar
+```
+![image](./record/pic/3-8.png)
+
+#### 3-9&3-10 进程的调度统计
+```bash
+cat /proc/15366/status
+```
+![image](./record/pic/3-9.png)
+进程主动切换的次数8,进程主动切换的次数213<br>
+
+```bash
+cat /proc/15363/stat
+```
+![image](./record/pic/3-10.png)
+
+#### 3-11&3-12&3-13&3-14普通进程的 CFS 调度
+* nice 命令可以用-xx 给出调整的数值(降低优先级 xx),也可以用“-n xx”方式直接设定 NICE 值(-
+20~19)
+* taskset -c 0　在命令前加上这条语句可以绑定进程运行在制定CPU<br>
+3-11 执行 Run-NICE.sh 脚本并用 ps –a 查看
+![image](./record/pic/3-11.png)<br>
+
+3-12 用 top 观察优先权不同的两个进程
+![image](./record/pic/3-12.png)
+16460 号进程占用了 CPU 的 90.4%的时间,16461 号进程仅占用了 CPU 的 9.6%的时间。<br>
+
+3-13 /proc/PID/sched
+![image](./record/pic/3-13_1.png)
+![image](./record/pic/3-13_2.png)<br>
+3-14 /proc/PID/schedstat
+![image](./record/pic/3-14.png)
+
+#### 3-15&3-16创建实时进程
+* 以 root 身份运行 RT-process-demo 进程,如果以普通用户运行 RT-process-demo 则会报告不允许创建实时进程。<br>
+
+3-15 用 ps –al 观察 RT-process-demo 的四个观测点
+![image](./record/pic/3-15a.png)
+![image](./record/pic/3-15b.png)
+![image](./record/pic/3-15c.png)
+![image](./record/pic/3-15d.png)<br>
+3-16 用/proc/PID/sched 观察 RT-process-demo 的四个观测点
+![image](./record/pic/3-16a.png)<br>
+
+![image](./record/pic/3-16b.png)<br>
+
+![image](./record/pic/3-16c.png)<br>
+
+![image](./record/pic/3-16d.png)<br>
+
+```bash
+sudo taskset -c 0 ./RR-FIFO.sh
+```
+经过多次测试发现实验结果无法在ubuntu18.04 多核处理(非虚拟机)器下复现

3.进程调度/record/code/HelloWorld-loop-getchar.c

+#include <stdio.h>
+int main()
+{
+    long i,j,temp;
+    printf("HelloWorld!\n");
+    while(1)
+    {
+        for (i=0;i<1024*1024*1024;i++)
+    {
+        temp+=1;
+    }
+        printf("one iteration!\n");
+        getchar();
+    }
+    return 0;
+}
\ No newline at end of file

3.进程调度/record/code/HelloWorld-loop.c

+#include <stdio.h>
+int main()
+{
+    long i,j,temp;
+    printf("HelloWorld!\n");
+    while(1)
+    {
+        for (i=0;i<1024*1024*1024;i++)
+    {
+        temp+=1;
+    }
+        printf("one iteration!\n");
+    }
+    return 0;
+}
\ No newline at end of file

3.进程调度/record/code/RR-FIFO-sched.c

+#include <sched.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+int main(int argc,char ** argv)
+{
+    long i,j,temp;
+    char cmd_str[100];
+    int rc,current_scheduler_policy;
+    struct sched_param my_params;
+    //将要设置的调度参数
+    if(argc!=3)
+    {
+        printf("usage:RR-FIFO-sched sched_class priority \nsched_class: 0 for CFS; 1 forFIFO; 2 for RR\n");
+        exit(1);
+    }
+    my_params.sched_priority=atoi(argv[2]);
+    rc=sched_setscheduler(0,atoi(argv[1]),&my_params);
+    if(rc<0)
+    {
+        perror("sched_setscheduler error\n");
+        exit(0);
+    }
+    current_scheduler_policy=sched_getscheduler(0);
+    printf("the PID:%d current scheduler = %d \n", getpid(),current_scheduler_policy);
+    for(i=0;i<1024*1024*1024;i++)
+        for(j=0;j<10;j++)
+            temp++;
+    sprintf(cmd_str,"cat /proc/%d/sched > ./sched-%d ; date >> ./sched-%d", getpid(),
+    getpid(), getpid());
+    system(cmd_str);
+    //记录各个进程的/proc/PID/sched 以及时间信息
+    return 0;
+}
\ No newline at end of file

3.进程调度/record/code/RR-FIFO.sh

+./RR-FIFO-sched 2 90&
+./RR-FIFO-sched 2 90&
+sleep 5s
+./RR-FIFO-sched 1 95&
\ No newline at end of file

3.进程调度/record/code/RT-process-demo.c

+#include <sched.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+
+int main()
+{
+    int rc,current_scheduler_policy;
+    struct sched_param my_params;
+    //将要设置的调度参数
+    current_scheduler_policy=sched_getscheduler(0);
+    printf("SCHED_OTHER = %d SCHED_FIFO =%d SCHED_RR=%d \n", SCHED_OTHER, SCHED_FIFO,SCHED_RR);
+    printf("the current scheduler = %d \n", current_scheduler_policy);
+    printf("press any key to change the current scheduler and priority to SCHED_RR\n");
+    getchar();
+    //checkpoint 1
+    my_params.sched_priority=sched_get_priority_max(SCHED_RR); // 最高的 RR 实时优先级
+    rc=sched_setscheduler(0,SCHED_RR,&my_params);
+    //设置为 RR 实时进程
+    if(rc<0)
+    {
+        perror("sched_setscheduler to SCHED_RR error");
+        exit(0);
+    }
+    current_scheduler_policy=sched_getscheduler(0);
+    printf("the current scheduler = %d \n", current_scheduler_policy);
+    printf("press any key to change the current scheduler and priority to SCHED_FIFO\n");
+    getchar();
+    //checkpoint 2
+    my_params.sched_priority=sched_get_priority_min(SCHED_FIFO); // 最低 FIFO 实时优先级
+    rc=sched_setscheduler(0,SCHED_FIFO,&my_params);
+    //设置为 FIFO 实时进程
+    if(rc<0)
+    {
+        perror("sched_setscheduler to SCHED_FIFO error");
+        exit(0);
+    }
+    current_scheduler_policy=sched_getscheduler(0);
+    printf("the current scheduler = %d \n", current_scheduler_policy);
+    printf("press any key to ange the current scheduler and priority to SCHED_OTHER(CFS)\n");
+    getchar();
+    //checkpoint 3
+    rc=sched_setscheduler(0,SCHED_OTHER,&my_params);
+    //设置为普通进程 3
+    if(rc<0)
+    {
+        perror("sched_setscheduler to SCHED_OTHER error");
+        exit(0);
+    }
+    current_scheduler_policy=sched_getscheduler(0);
+    printf("the current scheduler = %d \n", current_scheduler_policy);
+    printf("press any key to exit\n");
+    getchar();
+    //checkpoint 4
+    return 0;
+}
\ No newline at end of file

3.进程调度/record/code/Run-NICE.sh

+taskset -c 0 ./HelloWorld-loop &
+taskset -c 0 nice -10 ./HelloWorld-loop &
\ No newline at end of file