diff --git a/tests/cpu/test02/main.c b/tests/cpu/test02/main.c
new file mode 100644
index 0000000..008fabc
--- /dev/null
+++ b/tests/cpu/test02/main.c
@@ -0,0 +1,16 @@
+#include <fcntl.h>  
+#include <stdio.h> 
+#include <stdlib.h> 
+
+int main()  
+{  	
+	char    c;  
+	int     in;
+	int 	i;
+
+	in = open("in.txt", O_RDONLY);  
+	for(i=0; i<100; i++){
+		read(in,&c,1);
+	}
+	return 0;  
+} 
\ No newline at end of file
diff --git a/tests/cpu/test03/main.c b/tests/cpu/test03/main.c
new file mode 100644
index 0000000..aa84635
--- /dev/null
+++ b/tests/cpu/test03/main.c
@@ -0,0 +1,41 @@
+#include <stdio.h>  
+#include <stdlib.h>  
+#include <sys/time.h>  
+#include <time.h>  
+#include <sched.h>  
+#include <sys/types.h>  
+#include <unistd.h>      //pipe()  
+  
+int main()  
+{  
+    int x, i, fd[2], p[2];  
+    char send    = 's';  
+    char receive;  
+    pipe(fd);  
+    pipe(p);  
+    struct timeval tv;  
+    struct sched_param param;  
+    param.sched_priority = 0;  
+  
+    while ((x = fork()) == -1); 
+    if (x==0) {  
+        sched_setscheduler(getpid(), SCHED_FIFO, &param);  
+        gettimeofday(&tv, NULL);  
+        printf("Before Context Switch Time%u s, %u us\n", tv.tv_sec, tv.tv_usec);  
+        for (i = 0; i < 10000; i++) {  
+            read(fd[0], &receive, 1);  
+            write(p[1], &send, 1);  
+        }  
+        exit(0);  
+    }  
+    else {  
+        sched_setscheduler(getpid(), SCHED_FIFO, &param);  
+        for (i = 0; i < 10000; i++) {  
+            write(fd[1], &send, 1);  
+            read(p[0], &receive, 1);  
+        }  
+        gettimeofday(&tv, NULL);  
+        printf("After Context SWitch Time%u s, %u us\n", tv.tv_sec, tv.tv_usec);  
+    }  
+    return 0;  
+} 
\ No newline at end of file
diff --git a/tests/cpu/test04/main.go b/tests/cpu/test04/main.go
new file mode 100644
index 0000000..4bc6cc8
--- /dev/null
+++ b/tests/cpu/test04/main.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+	"fmt"
+	"time"
+	"runtime"
+)
+
+func cal()  {
+	for i :=0 ; i<1000000 ;i++{
+		//fmt.Printf("call:%d\n",i)
+		runtime.Gosched()
+	}
+}
+
+func main() {
+	runtime.GOMAXPROCS(1)
+
+	currentTime:=time.Now()
+	fmt.Println(currentTime)
+
+	go cal()
+	for i :=0 ; i<1000000 ;i++{
+		//fmt.Printf("main:%d\n",i)
+		runtime.Gosched()
+	}
+
+	currentTime=time.Now()
+	fmt.Println(currentTime)
+}
diff --git a/tests/cpu/test05/main.c b/tests/cpu/test05/main.c
new file mode 100644
index 0000000..a423f8c
--- /dev/null
+++ b/tests/cpu/test05/main.c
@@ -0,0 +1,91 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <pthread.h>
+
+int pipes[20][3];
+char buffer[10];
+int running = 1;
+
+void inti()
+{
+	int i =20;
+	while(i--)
+	{
+		if(pipe(pipes[i])<0)
+			exit(1);
+		pipes[i][2] = i;
+	}
+}
+
+void distroy()
+{
+	int i =20;
+	while(i--)
+	{
+		close(pipes[i][0]);
+		close(pipes[i][1]);
+	}
+}
+
+double self_test()
+{
+	int i =20000;
+	struct timeval start, end;
+	gettimeofday(&start, NULL);
+	while(i--)
+	{
+		if(write(pipes[0][1],buffer,10)==-1)
+			exit(1);
+		read(pipes[0][0],buffer,10);
+	}
+	gettimeofday(&end, NULL);
+	return (double)(1000000*(end.tv_sec-start.tv_sec)+ end.tv_usec-start.tv_usec)/20000;
+}
+
+void *_test(void *arg)
+{
+	int pos = ((int *)arg)[2];
+	int in = pipes[pos][0];
+	int to = pipes[(pos + 1)%20][1];
+	while(running)
+	{
+		read(in,buffer,10);
+		if(write(to,buffer,10)==-1)
+			exit(1);
+	}
+}
+
+double threading_test()
+{
+	int i = 20;
+	struct timeval start, end;
+	pthread_t tid;
+	while(--i)
+	{
+		pthread_create(&tid,NULL,_test,(void *)pipes[i]);
+	}
+	i = 10000;
+	gettimeofday(&start, NULL);
+	while(i--)
+	{
+		if(write(pipes[1][1],buffer,10)==-1)
+			exit(1);
+		read(pipes[0][0],buffer,10);
+	}
+	gettimeofday(&end, NULL);
+	running = 0;
+	if(write(pipes[1][1],buffer,10)==-1)
+		exit(1);
+	return (double)(1000000*(end.tv_sec-start.tv_sec)+ end.tv_usec-start.tv_usec)/10000/20;
+}
+
+
+int main()
+{
+	inti();
+	printf("%6.6f\n",self_test());
+	printf("%6.6f\n",threading_test());
+	distroy();
+	exit(0);
+}
\ No newline at end of file
diff --git a/tests/index.md b/tests/index.md
index fdbfe2a..c0630ca 100644
--- a/tests/index.md
+++ b/tests/index.md
@@ -1,6 +1,10 @@
 
 ## CPU相关实验
 - [likely 和 unlikely 汇编结果对比](tests/cpu/test01)
+- [read 系统调用开销](tests/cpu/test02)
+- [read 进程上下文切换开销](tests/cpu/test03)
+- [read 协程上下文切换开销](tests/cpu/test04)
+- [read 线程上下文切换开销](tests/cpu/test05)
 
 ## 磁盘相关实验
 - [使用fio磁盘压测工具进行性能压测分析](tests/disk/test01)
diff --git a/tests/network/index.md b/tests/network/index.md
deleted file mode 100644
index 5f062b4..0000000
--- a/tests/network/index.md
+++ /dev/null
@@ -1,9 +0,0 @@
-
-- [PHP单语言的百万连接测试源码](tests/network/test01)
-- [通过多 IP 达成单机百万连接（支持c、java、php三种语言）](tests/network/test02)
-- [通过端口重用达成单机百万连接（支持c、java、php三种语言）](tests/network/test03)
-- [一个模拟 tcpdump 的简单抓包程序](tests/network/test04)
-- [用 bridge 连接本机上的多组 veth，使其可以互相通信](tests/network/test05)
-- [命令行使用 namespace 的简单实验](tests/network/test06)
-- [手工模拟实现一个可以和外部通信的容器网络](tests/network/test07)
-- [socket端口复用SO_REUSEPORT测试](tests/network/test08)
\ No newline at end of file