如何在 C 中获取 CPU 和内存使用情况？ （在 Linux 系统中）

Question

我写的一个C程序是关于Vigenere加密和解码的。然后，我想在这个程序中添加 CPU 和内存使用情况。

但是，我不知道在这个程序中添加什么资源（CPU 和内存）利用率代码。我只想知道这个程序中的资源（CPU 和内存）利用率。

以下代码是我的vigenere加密和解码的C程序

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <omp.h>

int char_to_index(char c)
{
    /*if(c>='A' && c<='Z'){
        c=c+32;
    }*/
    char x = c;
    char result = x - 'a';
    return (int)result;
}

char index_to_char(int c)
{
    int result = c + 97;
    return (char)result;
}

char * xorencrypt(char * message, char * key) {
    int i;
    size_t messagelen = strlen(message);
    size_t keylen = strlen(key);

    char * encrypted = malloc(messagelen+1);
    //start to parallel
    omp_set_num_threads(8);
    #pragma omp parallel \
    private(i)
#pragma omp for
    for (i = 0; i < messagelen; i++) {
        int buf1 = char_to_index(message[i]);
        int buf2 = char_to_index(key[i % keylen]);
        char r = index_to_char(buf1 ^ buf2);
        encrypted[i] = r;
    }

    encrypted[messagelen] = '\0';

    return encrypted;
}

char * xordecode(char * cript, char * key) {
    int i;
    size_t criptlen = strlen(cript);
    size_t keylen = strlen(key);

    char * message = malloc(criptlen+1);
    //start to parallel
    omp_set_num_threads(8);
    #pragma omp parallel \
    private(i)
#pragma omp for
    for (i = 0; i < criptlen; i++) {
        int buf1 = char_to_index(cript[i]);
        int buf2 = char_to_index(key[i % keylen]);
        char r = index_to_char(buf1 ^ buf2);
        message[i] = r;
    }

    message[criptlen] = '\0';

    return message;
}

int    time_substract(struct timeval *result, struct timeval *begin,struct timeval *end)
{
    if(begin->tv_sec > end->tv_sec)    return -1;
    if((begin->tv_sec == end->tv_sec) && (begin->tv_usec > end->tv_usec))    return -2;
    result->tv_sec    = (end->tv_sec - begin->tv_sec);
    result->tv_usec    = (end->tv_usec - begin->tv_usec);

    if(result->tv_usec < 0)
    {
        result->tv_sec--;
        result->tv_usec += 1000000;
    }
    return 0;
}

int main(int argc, const char * argv[]) {
    //count time!!!
    struct timeval start,stop,diff;
    memset(&start,0,sizeof(struct timeval));
    memset(&stop,0,sizeof(struct timeval));
    memset(&diff,0,sizeof(struct timeval));
    gettimeofday(&start,0);
    //count time!!!

    char * message = "By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. By using the article the, we’ve shown that it was one specific day that was long and one specific cup of tea that tasted good. ";
    printf("Input    : %s\n",message);
    char * key = "key";

    char * encrypted = xorencrypt(message, key);
    printf("Encrypted: %s\n", encrypted);

    char * message1 = xordecode(encrypted, key);
    printf("Decrypted: %s\n", message1);

    //count time!!!
    gettimeofday(&stop,0);
    time_substract(&diff,&start,&stop);
    printf("Total time : %d s,%d us\n",(int)diff.tv_sec,(int)diff.tv_usec);
    //count time!!!
    return 0;
}

Answer 1

您可能想看看getrusage() 系统调用。

它可以告诉您有关正在使用的内存类型以及使用了多少 CPU 时间的详细信息，包括进程本身和内核中的情况。