【cpu_loading】/proc/stat统计cpu的使用率
2024-05-09 18:44:37
参考：http://www.blogjava.net/fjzag/articles/317773.html
基于目前正在开发的手机
proc伪文件系统
/proc文件系统是一个伪文件系统，它只存在内存当中，而不占用外存空间。它以文件系统的方式为内核与进程提供通信的接口。用户和应用程序可以通过/proc得到系统的信息，并可以改变内核的某些参数。由于系统的信息，如进程，是动态改变的，所以用户或应用程序读取/proc目录中的文件时，proc文件系统是动态从系统内核读出所需信息并提交的。
/proc目录中有一些以数字命名的目录，它们是进程目录。系统中当前运行的每一个进程在/proc下都对应一个以进程号为目录名的目录/proc/pid，它们是读取进程信息的接口。此外，在Linux 2.6.0-test6以上的版本中/proc/pid目录中有一个task目录，/proc/pid/task目录中也有一些以该进程所拥有的线程的线程号命名的目录/proc/pid/task/tid，它们是读取线程信息的接口。
proc/stat
该文件中的所有值都是系统启动至今的数据，不同内核版本时间单位可能不同
cat stat
cpu 69904 21104 138494 23477594 1232 0 317 0 0 0
cpu0 28792 2066 56307 2858036 131 0 125 0 0 0
cpu1 27146 1804 51688 2860147 84 0 15 0 0 0
cpu2 5561 1066 10786 2943586 87 0 105 0 0 0
cpu3 4716 642 7122 2951398 35 0 6 0 0 0
cpu4 2109 9525 8942 2952628 626 0 40 0 0 0
cpu5 916 2241 2465 2968654 145 0 10 0 0 0
cpu6 361 1950 682 2971229 62 0 8 0 0 0
cpu7 300 1808 501 2971912 60 0 6 0 0 0
intr 10805705 0 3500279 5996187 0 0 1 18 54 973 26755 0 0 115777 0 5 31482 0 0 0 0 77498 0 22550 28 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4610 0 0 0 0 0 0 0 0 0 0 0 0 27384 0 0 2965 2947 0 17 1 0 0 1 0 1 270 0 0 6 10 249 0 0 0 0 0 0 0
ctxt 7732037
btime 1325375998
processes 28877
procs_running 1
procs_blocked 0
softirq 5725677 1 2134789 0 0 0 0 74120 1979642 0 1537125cpu 69904 21104 138494 23477594 1232 0 317 0 0 0
是CPU总的使用情况：
进程的nice，进程的nice值一般是-20～19，他影响的是cpu分配给进程的时间片
对nice值一个形象比喻，假设在一个CPU轮转中，有2个runnable的进程A和B，如果他们的nice值都为0，假设内核会给他们每人分配1k个cpu时间片。但是假设进程A的为0，但是B的值为-10，那么此时CPU可能分别给A和B分配1k和1.5k的时间片。故可以形象的理解为，nice的值影响了内核分配给进程的cpu时间片的多少，时间片越多的进程，其优先级越高
参数： 解析
(jiffies是内核中的一个全局变量，用来记录自系统启动一来产生的节拍数，在linux中，一个节拍大致可理解为操作系统进程调度的最小时间片，不同linux内核可能值有不同，通常在1ms到10ms之间)类似time_in_stat里面的时间取的是10ms
user：69904 处于用户态的运行时间，不包含nice值为负的进程
nice：21104 nice值为负的进程所占用的CPU时间
system：138494 核心态（内核态）的运行时间
idle：23477594 除I/O等待时间以外的其他等待时间
iowait：1232 IO等待时间（since 2.5.41之后加入）
irq：0 硬中断时间
softirq:317 软中断的时间
stealstolen：0 which is the time spent in other operating systems when running in a virtualized environment(since 2.6.11)
guest:0 which is the time spent running a virtual CPU for guest operating systems under the control of the Linux kernel(since 2.6.24)
至于这个结论，我不是很赞同啊
总的cpu时间totalCpuTime = user + nice + system + idle + iowait + irq + softirq + stealstolen + guest
下面是根据上面的内容计算出的cpu的使用率
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/time.h>#include "cpu_loading.h"static si get_argv(char *time_char)
{char *ch = time_char;si ret = 0;if( *ch == '0'){fprintf(stderr, "interval should not be zero\n");return INVALID_ARGV;}for(ch=time_char; *ch; ch++){if( *ch == '-' || !(*ch >= '0' || *ch <= '9')){fprintf(stderr, "please input the correct argv time(no negative)\n");return INVALID_ARGV;}ret = ret*10+(*ch-'0');}return ret;
}static s8 get_init_freq_count(const char *cpu_cur_path, u8 *size, ui *cpu_available_freq)
{FILE *fp = NULL;fp = fopen(cpu_cur_path, "r");u8 i = 0;if(fp==NULL){fprintf(stderr, "failed opend file:", cpu_cur_path);return INVALID_ARGV;}// even freq // odd countfor(i=0; i<MAX_AVALLABLE_FREQ; i=i+2){cpu_available_freq[i+1] = 0;if(fscanf(fp,"%d", cpu_available_freq+i)!=1)break;}*size = i;fclose(fp);return 0;
}static void debug_cpufreq_count(u8 cpu0_size, ui *cpu0_available_freq,
u8 cpu4_size, ui *cpu4_available_freq)
{u8 i = 0;for(i=0;i<cpu0_size; i=i+2){printf("%d\t%d\n", cpu0_available_freq[i], cpu0_available_freq[i+1]);}printf("\n");for(i=0;i<cpu4_size; i=i+2){printf("%d\t%d\n", cpu4_available_freq[i], cpu4_available_freq[i+1]);}
}static s8 calculate_freq_percent(const u8 cpu_size, ui *cpu_available_freq, ui total_count, char *file_path)
{u8 i = 0;FILE *fp = NULL;fp = fopen(file_path, "r");ui cur_cpu = 0;if(fp==NULL){fprintf(stderr, "", file_path);return FAILED_OPEN_FILE;}while(fscanf(fp,"%d", &cur_cpu)==1){for(i=0;i<cpu_size; i=i+2){if(cur_cpu==cpu_available_freq[i]){cpu_available_freq[i+1]++;break;}}}fclose(fp);return 0;
}static s8 statistic_cpu_stat(const char *stat_path, ui count)
{FILE *fp = NULL;FILE *fp_cpu = NULL;char cpu_stat[BUFFER_SIZE];char *result_stat;u8 i = 0;fp = fopen(stat_path, "r");if(fp==NULL){fprintf(stderr, "failed opend file:\n", stat_path);return INVALID_ARGV;}if(count%2==0){fp_cpu = fopen(START_STAT,"a");}else{fp_cpu = fopen(END_STAT,"a");}if(fp_cpu==NULL){fprintf(stderr, "failed opend file:\n");return INVALID_ARGV;}fgets(cpu_stat, BUFFER_SIZE, fp);while(fgets(cpu_stat, BUFFER_SIZE, fp)&&i<8){result_stat = cpu_stat+3;fprintf(fp_cpu, "%s", result_stat);i++;}fclose(fp);fclose(fp_cpu);return 0;
}static s8 store_cpu_freq(ui cur_freq, char *file_path)
{FILE *fp = NULL;fp = fopen(file_path, "a");if(fp==NULL){fprintf(stderr, "failed opend file:\n", file_path);return FAILED_OPEN_FILE;}fprintf(fp, "%d\n", cur_freq);fclose(fp);return 0;
}static ui get_store_cur_freq(const char *file_path, char *store_path)
{FILE *fp = NULL;ui cur_cpu_freq = 0;fp = fopen(file_path, "r");if(fp==NULL){fprintf(stderr, "failed opend file:\n", file_path);return INVALID_ARGV;}fscanf(fp, "%d", &cur_cpu_freq);fclose(fp);store_cpu_freq(cur_cpu_freq, store_path);return 0;
}static void clear_envirment()
{remove(LITTLE_CORE);remove(BIG_CORE);remove(START_STAT);remove(END_STAT);
}
static s8 data_simpling(si accummulate_time, si interval, ui total_count)
{ struct timeval start, end;float timeuse = 0.0;ui count = 0;u8 i = 0;gettimeofday(&start, NULL);while(count<total_count){get_store_cur_freq(CPU0_CUR_FREQ_PATH, LITTLE_CORE);get_store_cur_freq(CPU4_CUR_FREQ_PATH, BIG_CORE);statistic_cpu_stat(PROC_CPU_STAT, count);usleep(100000);count++;}gettimeofday(&end, NULL);timeuse = (1000000 * ( end.tv_sec - start.tv_sec ) + end.tv_usec - start.tv_usec)/1000.0;printf("time_use is %.2f\n", timeuse);}static s8 compute_cpu_loading(char *start_file, char *end_file, float *pcpu_set)
{FILE *fp_start, *fp_end;ui start_buffer[BUFFER_SIZE], end_buffer[BUFFER_SIZE];memset(start_buffer, 0, BUFFER_SIZE);memset(end_buffer, 0, BUFFER_SIZE);u8 i = 0, cpu_id, j;const u8 cpu_consist = 11;uli total_time = 0;ui idle_time = 0, set = 0;float pcpu = 0.0;fp_start = fopen(start_file, "r");if(fp_start==NULL){fprintf(stderr, "failed opend file", start_file);return FAILED_OPEN_FILE;}fp_end = fopen(end_file, "r");if(fp_end==NULL){fprintf(stderr, "failed opend file", end_file);return FAILED_OPEN_FILE;}while(fscanf(fp_start, "%d", start_buffer+i)==1 &&fscanf(fp_end, "%d", end_buffer+i)==1){if(i==0){cpu_id = start_buffer[i];}ui minus = end_buffer[i]-start_buffer[i];total_time+=minus;if(i==4){idle_time = minus;//printf("%d\t%d\t%d\t%d\n", end_buffer[i], start_buffer[i], idle_time, total_time);}i++;if(i==cpu_consist){set++;pcpu = ((total_time-idle_time)*1.0/total_time);//printf("%d\t%f\n", cpu_id, pcpu);pcpu_set[cpu_id]+=pcpu;i=0;total_time = 0;memset(start_buffer, 0, BUFFER_SIZE);}}set/=8;for(i=0;i<=cpu_id; i++){pcpu_set[i] /=set;printf("cpu%d is %f\n", i, pcpu_set[i]);}fclose(fp_start);fclose(fp_end);return 0;
}int main(int argc, char *argv[])
{si interval , accummulate_time = 0;ui cpu0_freq , cpu4_freq = 0;ui total_count = 0;u8 cpu0_size, cpu4_size, i , j ;ui cpu0_available_freq[MAX_AVALLABLE_FREQ], cpu4_available_freq[MAX_AVALLABLE_FREQ];float pcpu_set[BUFFER_SIZE];// input argc less than 1if( argc < 1 ){fprintf(stderr, "you must input two argv");fprintf(stderr, "first: cal cpu loading tool \n");fprintf(stderr, "secn: interval time(default:100ms) \n");fprintf(stderr, "expl: ./data/cpu_loading 100\n");return INVALID_ARGV;}// input argc 1if(argc==1){interval = 100;accummulate_time = 60;// input argc 2}else if(argc==2){interval = get_argv(argv[1]);if(interval<0){return INVALID_ARGV;}accummulate_time = 60;// input argc 3}else{interval = get_argv(argv[1]);if(interval<0){return INVALID_ARGV;}accummulate_time = get_argv(argv[2]);if(accummulate_time<0){return INVALID_ARGV;}}printf("interval is %d\n", interval);printf("accummulate_time is %d\n", accummulate_time);get_init_freq_count(CPU0_AVAILABLE_FREQ_PATH, &cpu0_size, cpu0_available_freq);get_init_freq_count(CPU4_AVAILABLE_FREQ_PATH, &cpu4_size, cpu4_available_freq);// debug//debug_cpufreq_count(cpu0_size, cpu0_available_freq ,cpu4_size, cpu4_available_freq);total_count = (accummulate_time*1000)/interval;clear_envirment();// data cimplingdata_simpling(accummulate_time, interval, total_count);calculate_freq_percent(cpu0_size, cpu0_available_freq, total_count, LITTLE_CORE);calculate_freq_percent(cpu4_size, cpu4_available_freq, total_count, BIG_CORE);// debugdebug_cpufreq_count(cpu0_size, cpu0_available_freq ,cpu4_size, cpu4_available_freq);// compute pcpuxcompute_cpu_loading(START_STAT, END_STAT, pcpu_set);// show resultfor(i=0; i<cpu0_size; i=i+2){if(i==0)printf("\t");printf("%d\t", cpu0_available_freq[i]);if(i==cpu0_size-2)printf("\n");}for(i=0; i<cpu0_size; i=i+2){if(i==0)printf("little\t");printf("%.3f%\t", cpu0_available_freq[i+1]*1.0/total_count*100);if(i==cpu0_size-2)printf("\n");}for(i=0;i<4;i++){printf("cpu%d\t", i);for(j=0;j<cpu0_size;j=j+2){printf("%.3f%\t", (cpu0_available_freq[j+1]*1.0/total_count)*100*pcpu_set[i]);}printf("\n");}printf("\n");for(i=0; i<cpu4_size; i=i+2){if(i==0)printf("\t");printf("%d\t", cpu4_available_freq[i]);if(i==cpu4_size-2)printf("\n");}for(i=0; i<cpu4_size; i=i+2){if(i==0)printf("big\t");printf("%.3f%\t", cpu4_available_freq[i+1]*1.0/total_count*100);if(i==cpu4_size-2)printf("\n");}for(i=4;i<8;i++){printf("cpu%d\t", i);for(j=0;j<cpu4_size;j=j+2){printf("%.3f%\t", (cpu4_available_freq[j+1]*1.0/total_count)*100*pcpu_set[i]);}printf("\n");}return 0;
}其中头文件的定义如下：
#define INVALID_ARGV -1
#define FAILED_OPEN_FILE -2
#define MAX_AVALLABLE_FREQ 40
#define BUFFER_SIZE 512#define CPU0_CUR_FREQ_PATH "/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq"
#define CPU4_CUR_FREQ_PATH "/sys/devices/system/cpu/cpu4/cpufreq/scaling_cur_freq"
#define CPU0_AVAILABLE_FREQ_PATH "/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies"
#define CPU4_AVAILABLE_FREQ_PATH "/sys/devices/system/cpu/cpu4/cpufreq/scaling_available_frequencies"
#define PROC_CPU_STAT "/proc/stat"
#define LITTLE_CORE "/sdcard/little_core"
#define BIG_CORE "/sdcard/big_core"
#define START_STAT "/sdcard/stat_start.txt"
#define END_STAT "/sdcard/stat_end.txt"typedef signed int si;
typedef signed char s8;
typedef unsigned char u8;
typedef unsigned int ui;
typedef unsigned long int uli;运行结果如下：
从另一个维度计算cpu_loading，简称
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/time.h>#include "cpu_loading.h"static void debug_cpufreq_count(u8 cpu0_size, ui *cpu0_available_freq,
u8 cpu4_size, ui *cpu4_available_freq, ui total_count)
{u8 i = 0;for(i=0;i<cpu0_size; i=i+2){printf("%d\t%.2f%\n", cpu0_available_freq[i], cpu0_available_freq[i+1]*1.0/total_count*100);}printf("\n");for(i=0;i<cpu4_size; i=i+2){printf("%d\t%.2f%\n", cpu4_available_freq[i], cpu4_available_freq[i+1]*1.0/total_count*100);}
}static si get_argv(char *time_char)
{char *ch = time_char;si ret = 0;if( *ch == '0'){fprintf(stderr, "interval should not be zero\n");return INVALID_ARGV;}for(ch=time_char; *ch; ch++){if( *ch == '-' || !(*ch >= '0' || *ch <= '9')){fprintf(stderr, "please input the correct argv time(no negative)\n");return INVALID_ARGV;}ret = ret*10+(*ch-'0');}return ret;
}static s8 get_init_freq_count(const char *cpu_cur_path, u8 *size, ui *cpu_available_freq)
{FILE *fp = NULL;fp = fopen(cpu_cur_path, "r");u8 i = 0;if(fp==NULL){fprintf(stderr, "failed opend file:", cpu_cur_path);return INVALID_ARGV;}// even freq // odd countfor(i=0; i<MAX_AVALLABLE_FREQ; i=i+2){cpu_available_freq[i+1] = 0;if(fscanf(fp,"%d", cpu_available_freq+i)!=1)break;}*size = i;fclose(fp);return 0;
}static void clear_envirment()
{remove(LITTLE_CORE);remove(BIG_CORE);remove(START_STAT);remove(END_STAT);remove(PCPU_PATH);
}static s8 statistic_cpu_stat(const char *stat_path, ui count)
{FILE *fp = NULL;FILE *fp_cpu = NULL;char cpu_stat[BUFFER_SIZE];char *result_stat;u8 i = 0;fp = fopen(stat_path, "r");if(fp==NULL){fprintf(stderr, "failed opend file:\n", stat_path);return INVALID_ARGV;}if(count%2==0){fp_cpu = fopen(START_STAT,"a");}else{fp_cpu = fopen(END_STAT,"a");}if(fp_cpu==NULL){fprintf(stderr, "failed opend file:\n");return INVALID_ARGV;}// aband sum pcpu fgets(cpu_stat, BUFFER_SIZE, fp);while(fgets(cpu_stat, BUFFER_SIZE, fp)&&i<8){result_stat = cpu_stat+3;fprintf(fp_cpu, "%s", result_stat);i++;}fclose(fp);fclose(fp_cpu);return 0;
}static s8 store_cpu_freq(ui cur_freq, char *file_path)
{FILE *fp = NULL;fp = fopen(file_path, "a");if(fp==NULL){fprintf(stderr, "failed opend file:\n", file_path);return FAILED_OPEN_FILE;}fprintf(fp, "%d\n", cur_freq);fclose(fp);return 0;
}static ui get_store_cur_freq(const char *file_path, char *store_path)
{FILE *fp = NULL;ui cur_cpu_freq = 0;fp = fopen(file_path, "r");if(fp==NULL){fprintf(stderr, "failed opend file:\n", file_path);return INVALID_ARGV;}fscanf(fp, "%d", &cur_cpu_freq);fclose(fp);store_cpu_freq(cur_cpu_freq, store_path);return 0;
}static s8 data_simpling(si accummulate_time, si interval, ui total_count)
{ struct timeval start, end;float timeuse = 0.0;ui count = 0;u8 i = 0;gettimeofday(&start, NULL);while(count<total_count){get_store_cur_freq(CPU0_CUR_FREQ_PATH, LITTLE_CORE);get_store_cur_freq(CPU4_CUR_FREQ_PATH, BIG_CORE);statistic_cpu_stat(PROC_CPU_STAT, count);usleep(interval*1000);count++;}gettimeofday(&end, NULL);timeuse = (1000000 * ( end.tv_sec - start.tv_sec ) + end.tv_usec - start.tv_usec)/1000.0;printf("time_use is %.2f\n", timeuse);}static s8 store_pcpu(u8 cpu_id, float pcpu)
{FILE *fp = NULL;fp = fopen(PCPU_PATH, "a");if(fp==NULL){fprintf(stderr, "failed opend file:\n", PCPU_PATH);return FAILED_OPEN_FILE;}fprintf(fp, "%f\n", pcpu);fclose(fp);return 0;
}static si compute_cpu_loading_freq(char *start_file, char *end_file, float *pcpu_set)
{FILE *fp_start, *fp_end;ui start_buffer[BUFFER_SIZE], end_buffer[BUFFER_SIZE];memset(start_buffer, 0, BUFFER_SIZE);memset(end_buffer, 0, BUFFER_SIZE);u8 i = 0, cpu_id, j;const u8 cpu_consist = 11;uli total_time = 0;ui idle_time = 0, set = 0;float pcpu = 0.0;fp_start = fopen(start_file, "r");if(fp_start==NULL){fprintf(stderr, "failed opend file", start_file);return FAILED_OPEN_FILE;}fp_end = fopen(end_file, "r");if(fp_end==NULL){fprintf(stderr, "failed opend file", end_file);return FAILED_OPEN_FILE;}while(fscanf(fp_start, "%d", start_buffer+i)==1 &&fscanf(fp_end, "%d", end_buffer+i)==1){if(i==0){cpu_id = start_buffer[i];}ui minus = end_buffer[i]-start_buffer[i];total_time+=minus;if(i==4){idle_time = minus;//printf("%d\t%d\t%d\t%d\n", end_buffer[i], start_buffer[i], idle_time, total_time);}i++;if(i==cpu_consist){set++;pcpu = ((total_time-idle_time)*1.0/total_time);store_pcpu(cpu_id, pcpu);pcpu_set[cpu_id]+=pcpu;i=0;total_time = 0;memset(start_buffer, 0, BUFFER_SIZE);}}set/=8;fclose(fp_start);fclose(fp_end);return set;
}static s8 calculate_freq_percent(const u8 cpu0_size, ui *cpu0_available_freq,
ui total_count, const u8 cpu4_size, ui *cpu4_available_freq, si set_group)
{u8 i = 0, k;ui j = 0;FILE *fp_cpu0 = NULL;FILE *fp_cpu4 = NULL;FILE *fp_stat = NULL;ui cpu0_cur_cpu, cpu4_cur_cpu;float pcpu[BUFFER_SIZE];float pcpu_per[MAX_AVALLABLE_FREQ][BUFFER_SIZE*10];ui pcpu_per_count[MAX_AVALLABLE_FREQ][BUFFER_SIZE*10];fp_cpu0 = fopen(LITTLE_CORE, "r");if(fp_cpu0==NULL){fprintf(stderr, "", LITTLE_CORE);return FAILED_OPEN_FILE;}fp_cpu4 =fopen(BIG_CORE, "r");if(fp_cpu4==NULL){fprintf(stderr, "", BIG_CORE);return FAILED_OPEN_FILE;}fp_stat = fopen(PCPU_PATH, "r");if(fp_stat==NULL){fprintf(stderr, "", PCPU_PATH);return FAILED_OPEN_FILE;}while(fscanf(fp_cpu0,"%d", &cpu0_cur_cpu)==1&&fscanf(fp_cpu4,"%d", &cpu4_cur_cpu)==1){for(i=0;i<cpu0_size; i=i+2){if(cpu0_cur_cpu==cpu0_available_freq[i]){cpu0_available_freq[i+1]++;break;}} for(i=0;i<cpu4_size; i=i+2){if(cpu4_cur_cpu==cpu4_available_freq[i]){cpu4_available_freq[i+1]++;break;}}if(j%2==1){i=0;while(fscanf(fp_stat, "%f", pcpu+i)==1){pcpu_per[i][cpu0_cur_cpu/1000]+=pcpu[i];pcpu_per_count[i][cpu0_cur_cpu/1000]++;//printf("%d\t%d\t%f\t%d\n", i, cpu0_cur_cpu, pcpu[i], pcpu_per_count[i][cpu0_cur_cpu/1000]);i++;if(i>3){break;}}while(fscanf(fp_stat, "%f", pcpu+i)==1){pcpu_per[i][cpu4_cur_cpu/1000]+=pcpu[i];pcpu_per_count[i][cpu4_cur_cpu/1000]++;//printf("%d\t%d\t%.2f\t%d\n", i, cpu4_cur_cpu, pcpu[i],pcpu_per_count[i][cpu4_cur_cpu/1000]);i++;if(i>7){break;}}}j++;}fclose(fp_cpu0);fclose(fp_stat);for(j=0;j<cpu0_size;j=j+2){if(j==0)printf(" \t");printf("%d\t", cpu0_available_freq[j]);if(j==cpu0_size-2)printf("\n");}for(i=0;i<4;i++){printf("%d\t", i);for(j=0;j<cpu0_size;j=j+2){if(pcpu_per_count[i][cpu0_available_freq[j]/1000]!=0){printf("%.2f%\t", pcpu_per[i][cpu0_available_freq[j]/1000]/(pcpu_per_count[i][cpu0_available_freq[j]/1000])*100);}else{printf("0.00%\t");} }printf("\n");}printf("\n");for(j=0;j<cpu4_size;j=j+2){if(j==0)printf(" \t");printf("%d\t", cpu4_available_freq[j]);if(j==cpu4_size-2)printf("\n");}for(i=4;i<8;i++){printf("%d\t", i);for(j=0;j<cpu4_size;j=j+2){if(pcpu_per_count[i][cpu4_available_freq[j]/1000]!=0){printf("%.2f%\t", pcpu_per[i][cpu4_available_freq[j]/1000]/(pcpu_per_count[i][cpu4_available_freq[j]/1000])*100);}else{printf("0.00%\t");} }printf("\n");}return 0;
}int main(int argc, char *argv[])
{si interval , accummulate_time = 0, set_group;ui cpu0_freq , cpu4_freq = 0;ui total_count = 0;u8 cpu0_size, cpu4_size, i , j ;ui cpu0_available_freq[MAX_AVALLABLE_FREQ], cpu4_available_freq[MAX_AVALLABLE_FREQ];float pcpu_set[BUFFER_SIZE];// input argc less than 1if( argc < 1 ){fprintf(stderr, "you must input two argv");fprintf(stderr, "first: cal cpu loading tool \n");fprintf(stderr, "secn: interval time(default:100ms) \n");fprintf(stderr, "expl: ./data/cpu_loading 100\n");return INVALID_ARGV;}// input argc 1if(argc==1){interval = 100;accummulate_time = 60;// input argc 2}else if(argc==2){interval = get_argv(argv[1]);if(interval<0){return INVALID_ARGV;}accummulate_time = 60;// input argc 3}else{interval = get_argv(argv[1]);if(interval<0){return INVALID_ARGV;}accummulate_time = get_argv(argv[2]);if(accummulate_time<0){return INVALID_ARGV;}}printf("interval is %d\n", interval);printf("accummulate_time is %d\n", accummulate_time);get_init_freq_count(CPU0_AVAILABLE_FREQ_PATH, &cpu0_size, cpu0_available_freq);get_init_freq_count(CPU4_AVAILABLE_FREQ_PATH, &cpu4_size, cpu4_available_freq);// debug//debug_cpufreq_count(cpu0_size, cpu0_available_freq ,cpu4_size, cpu4_available_freq);total_count = (accummulate_time*1000)/interval;clear_envirment();// data cimplingdata_simpling(accummulate_time, interval, total_count);set_group = compute_cpu_loading_freq(START_STAT, END_STAT, pcpu_set);calculate_freq_percent(cpu0_size, cpu0_available_freq, total_count, cpu4_size,cpu4_available_freq, set_group);return 0;
}#define INVALID_ARGV -1
#define FAILED_OPEN_FILE -2
#define MAX_AVALLABLE_FREQ 40
#define BUFFER_SIZE 512#define CPU0_CUR_FREQ_PATH "/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq"
#define CPU4_CUR_FREQ_PATH "/sys/devices/system/cpu/cpu4/cpufreq/scaling_cur_freq"
#define CPU0_AVAILABLE_FREQ_PATH "/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies"
#define CPU4_AVAILABLE_FREQ_PATH "/sys/devices/system/cpu/cpu4/cpufreq/scaling_available_frequencies"
#define PROC_CPU_STAT "/proc/stat"
#define LITTLE_CORE "/sdcard/little_core"
#define BIG_CORE "/sdcard/big_core"
#define START_STAT "/sdcard/stat_start.txt"
#define END_STAT "/sdcard/stat_end.txt"
#define PCPU_PATH "/sdcard/stat_result.txt"typedef signed int si;
typedef signed char s8;
typedef unsigned char u8;
typedef unsigned int ui;
typedef unsigned long int uli;计算结果如下：
interval is 100
accummulate_time is 20
time_use is 20596.07
768000 884000 1000000 1100000 1200000
0 41.64% 45.50% 45.19% 54.13% 52.41%
1 28.25% 28.78% 28.97% 24.77% 42.26%
2 23.41% 24.57% 16.36% 27.08% 46.81%
3 22.34% 15.81% 29.40% 20.00% 20.95%
768000 1050000 1225000 1400000 1500000 1570000
4 1.07% 5.82% 26.26% 10.00% 20.00% 40.00%
5 0.03% 4.00% 0.00% 0.00% 0.00% 0.00%
6 0.03% 0.00% 0.00% 0.00% 0.00% 0.00%
7 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%
io从
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