我正在尝试创建一个程序,该程序获取CPU(%)和内存(kB)的使用情况以在Ubuntu Terminal上显示该程序。 我一直在寻找一些显示给我看的命令,我明白了;
ps -p <pid> -o %cpu,%mem
当我直接在终端上对其进行测试时,它可以正常工作。但是在我的程序上,它给了我这个错误: error: garbage option
这是我的代码:
#include <unistd.h>
#include<time.h>
#include <stdio.h>
#include <stdlib.h>
#include<string.h>
int main (int argc, char *argv[], char *envp[]) {
int pid ; /* Process ID */
char usage[150];
char kill[50];
pid = fork () ; /* Process reaplication */
sprintf(usage,"%s%d%s","ps -p ", pid, " %cpu,%mem");
sprintf(kill, "%s%d", "kill -9 ", pid);
if ( pid < 0 ) { /*if fork do not work*/
perror ("Erro: ") ;
exit (-1) ; /* Ends process with error: -1 */
} else if( pid > 0 ) { /* If i'm parent process*/
for(int i=0;i<10;i++) {
system("clear");
printf("Processing (%ds)\n", i);
int aux;
for(aux=i;aux>0;aux--) {
printf("=");
}
printf("=\n");
system(usage);
sleep(1);
}
system(kill);
} else /* senão, sou o processo filho (pid == 0) { */
if(strcmp(argv[1],"cpu")==0) { /* if argv[1] = cpu -> Execute code using intese cpu*/
for(;;){}
}
if(strcmp(argv[1],"cpu-mem")) { /* if argv[1] = cpu-mem -> Execute code using intese cpu and memory */
int moment = clock();
for (;;) {
while(clock() - moment < 5){} /* makes mem use less intense */
malloc(sizeof(1000));
}
}
}
perror ("Erro: ") ; /* if do not work */
printf ("Tchau !\n") ;
exit(0) ; /* Ends process with success (código 0) *
}
因此,我试图将程序分为10个步骤。每个人都要执行命令。步骤之间只有一秒钟
如何使此代码起作用?还有其他我可以用来替代的命令吗?
答案 0 :(得分:2)
已经解决了。我就是这样做的:
#include <unistd.h>
#include<time.h>
#include <stdio.h>
#include <stdlib.h>
#include<string.h>
int main (int argc, char *argv[], char *envp[]) {
int pid ; /* Process ID */
char mem_usage[50];
char cpu_usage[50];
char kill[50];
pid = fork () ; /* Process reaplication */
sprintf(cpu_usage,"%s%d%s","ps -p ", pid, " -o %cpu | grep -v %CPU");
sprintf(mem_usage, "%s%d%s", "pmap -x ", pid," | grep total | awk '{print $3}'");
sprintf(kill, "%s%d", "kill -9 ", pid);
if ( pid < 0 ) { /*if fork do not work*/
perror ("Erro: ") ;
exit (-1) ; /* Ends process with error: -1 */
}
else if( pid > 0 ) /* If i'm parent process*/
{
for(int i=0;i<10;i++)
{
system("clear");
if(i == 0 || i == 3 || i == 6 || i == 9)
{
printf("Processing.\n");
}
else if(i == 1 || i == 4 || i == 7)
{
printf("Processing..\n");
}
else if(i == 2 || i == 5 || i == 8)
{
printf("Processing...\n");
}
printf("%ds\n", i+1);
printf("================\n");
printf("CPU(%%)\n");
system(cpu_usage);
printf("MEM(kB)\n");
system(mem_usage);
sleep(1);
}
system(kill);
}
else /* senão, sou o processo filho (pid == 0) */
{
if(strcmp(argv[1],"cpu")==0) /* if argv[1] = cpu -> Execute code using intese cpu*/
{
for(;;){}
}
if(strcmp(argv[1],"cpu-mem")==0) /* if argv[1] = cpu-mem -> Execute code using intese cpu and memory */
{
int moment = clock();
for (;;) {
sleep(0.001); /* makes mem use less intense */
malloc(50* sizeof(int));
}
}
}
perror ("Erro: ") ; /* if do not work */
printf ("Tchau !\n") ;
exit(0) ; /* Ends process with success (código 0) */
}
我已经使用ps -p <pid> -o %cpu | grep -v %CPU
来获取CPU(%)使用率。
要计算内存(kB)使用情况:pmap -x <pid> " | grep total | awk '{print $3}'"
在这种情况下,我使用awk '{print $3}'
打印来自Comand pmap -x <pid>
和grep total
的第三列,仅打印我需要的行。
有两种方法可以运行此代码:
这是学习CPU和内存如何工作的好练习。