androbench 代码实现

AndroBench是一个Android平台上的存储性能测试工具，它可以测试存储设备的读写速度、随机读写速度、SQLite数据库性能等。下面是一个简单的C语言实现AndroBench的代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#define FILE_SIZE 1024*1024*10 // 10MB
#define BLOCK_SIZE 4096 // 4KB

void test_write_speed(char *filename) {
    FILE *fp;
    char *buf;
    int i, j;
    clock_t start, end;
    double duration, speed;

    buf = (char *)malloc(BLOCK_SIZE);
    memset(buf, 'A', BLOCK_SIZE);

    fp = fopen(filename, "wb");
    if (fp == NULL) {
        printf("Failed to open file %s\n", filename);
        return;
    }

    start = clock();
    for (i = 0; i < FILE_SIZE / BLOCK_SIZE; i++) {
        fwrite(buf, BLOCK_SIZE, 1, fp);
    }
    end = clock();

    duration = (double)(end - start) / CLOCKS_PER_SEC;
    speed = (double)FILE_SIZE / duration / 1024 / 1024;

    printf("Write speed: %.2f MB/s\n", speed);

    fclose(fp);
    free(buf);
}

void test_read_speed(char *filename) {
    FILE *fp;
    char *buf;
    int i, j;
    clock_t start, end;
    double duration, speed;

    buf = (char *)malloc(BLOCK_SIZE);

    fp = fopen(filename, "rb");
    if (fp == NULL) {
        printf("Failed to open file %s\n", filename);
        return;
    }

    start = clock();
    for (i = 0; i < FILE_SIZE / BLOCK_SIZE; i++) {
        fread(buf, BLOCK_SIZE, 1, fp);
    }
    end = clock();

    duration = (double)(end - start) / CLOCKS_PER_SEC;
    speed = (double)FILE_SIZE / duration / 1024 / 1024;

    printf("Read speed: %.2f MB/s\n", speed);

    fclose(fp);
    free(buf);
}

int main(int argc, char *argv[]) {
    char *filename = "test.bin";

    test_write_speed(filename);
    test_read_speed(filename);

    return 0;
}

这个示例代码实现了AndroBench中的写入和读取测试，它会在当前目录下创建一个10MB的二进制文件，并测试写入和读取这个文件的速度。你可以根据需要修改文件大小和块大小来进行测试。