perfstat_cpu_util 接口
perfstat_cpu_util 接口返回类型为 perfstat_cpu_util_t的一组结构，该结构在 libperfstat.h 文件中定义
perfstat_cpu_util 接口包含以下字段:| 项 | 描述信息 |
|---|---|
| CPU ID | 保留 CPU 标识 |
| 授权 | 分区的权利 |
| 用户百分比 | 用户方式下的利用率百分比 |
| 内核百分比 | 内核方式下的利用率百分比 |
| 空闲百分比 | 空闲方式下的利用率百分比 |
| 等待百分比 | 处于等待方式的利用率百分比 |
| 物理繁忙 | 物理 CPU 正忙 |
| 物理耗用时间 | 分区使用的总 CPU 数 |
| 自由百分比 | 上一个时间间隔内的平均频率 (以百分比计) |
| 授权百分比 | 已使用权利的百分比 |
| 总线百分比 | 权利繁忙百分比 |
| 闲置捐赠比例 | 捐赠的空闲周期百分比 |
| 总线 (busy_donated_pct) | 捐赠的忙碌周期百分比 |
| 闲置被盗率 | 失窃的空闲周期所占的百分比 |
| 总线 (busy_stolen_pct) | 窃用的忙碌周期所占的百分比 |
| 浮点 l_user_pct | 以逻辑处理器记号表示的用户方式的利用率百分比 |
| 浮点 l_kern_pct | 内核方式下的利用率相对于逻辑处理器刻度的百分比 |
| 浮点 l_idle_pct | 以空闲方式使用逻辑处理器记号的百分比 |
| 浮点 l_wait_pct | 以逻辑处理器刻度标记表示的处于等待方式的利用率百分比 |
| u_longlong_t 时间差 | 对利用率求值的增量时间百分比 (以毫秒计) |
可以通过使用perfstat_cpu_util ，将 perfstat_rawdata_t 数据结构的类型字段分别指定为 UTIL_CPU_TOTAL 或 UTIL_CPU 来获取系统利用率和每个 CPU 利用率。 UTIL_CPU_TOTAL 和 UTIL_CPU 是可在 perfstat_rawdata_t 数据结构定义中引用的宏。
将
perrfstat_cpu_util API 用于系统级别的利用率如下所示:#include <libperfstat.h>
#define PERIOD 5
void main()
{
perfstat_cpu_total_t *newt, *oldt;
perfstat_cpu_util_t *util;
perfstat_rawdata_t data;
int rc;
oldt = (perfstat_cpu_total_t*)malloc(sizeof(perfstat_cpu_total_t)*1);
if(oldt==NULL){
perror ("malloc");
exit(-1);
}
newt = (perfstat_cpu_total_t*)malloc(sizeof(perfstat_cpu_total_t)*1);
if(newt==NULL){
perror ("malloc");
exit(-1);
}
util = (perfstat_cpu_util_t*)malloc(sizeof(perfstat_cpu_util_t)*1);
if(util==NULL){
perror ("malloc");
exit(-1);
}
rc = perfstat_cpu_total(NULL, oldt, sizeof(perfstat_cpu_total_t), 1);
if(rc <= 0)
{
perror("Error in perfstat_cpu_total");
exit(-1);
}
sleep(PERIOD);
rc = perfstat_cpu_total(NULL, newt, sizeof(perfstat_cpu_total_t), 1);
if(rc <= 0)
{
perror("Error in perfstat_cpu_total");
exit(-1);
}
data.type = UTIL_CPU_TOTAL;
data.curstat = newt; data.prevstat= oldt;
data.sizeof_data = sizeof(perfstat_cpu_total_t);
data.cur_elems = 1;
data.prev_elems = 1;
rc = perfstat_cpu_util(&data, util,sizeof(perfstat_cpu_util_t), 1);
if(rc <= 0)
{
perror("Error in perfstat_cpu_util");
exit(-1);
}
printf("=======Overall CPU Utilization Metrics=======\n");
printf("Utilization Metrics for a period of %d seconds\n",PERIOD);
printf("User Percentage = %f\n",util->user_pct);
printf("System Percentage = %f\n",util->kern_pct);
printf("Idle Percentage = %f\n",util->idle_pct);
printf("Wait Percentage = %f\n",util->wait_pct);
printf("Physical Busy = %f\n",util->physical_busy);
printf("Physical Consumed = %f\n",util->physical_consumed);
printf("Freq Percentage = %f\n",util->freq_pct);
printf("Entitlement Used Percentage = %f\n",util->entitlement_pct);
printf("Entitlement Busy Percentage = %f\n",util->busy_pct);
printf("Idle Cycles Donated Percentage = %f\n",util->idle_donated_pct);
printf("Busy Cycles Donated Percentage = %f\n",util->busy_donated_pct);
printf("Idle Cycles Stolen Percentage = %f\n",util->idle_stolen_pct);
printf("Busy Cycles Stolen Percentage = %f\n",util->busy_stolen_pct);
printf("User percentage for logical cpu in ticks = %f\n",util->l_user_pct);
printf("Sytem percentage for logical cpu in ticks= %f\n",util->l_kern_pct);
printf("Idle percentage for logical cpu in ticks= %f\n",util->l_idle_pct);
printf("Wait percentage for logical cpu in ticks= %f\n",util->l_wait_pct);
printf("delta time in milliseconds = %llu \n",util->delta_time);
printf("=============================================\n");
}=======Overall CPU Utilization Metrics=======
Utilization Metrics for a period of 5 seconds
User Percentage = 0.050689
System Percentage = 0.262137
Idle Percentage = 99.687172
Wait Percentage = 0.000000
Physical Busy = 0.003128
Physical Consumed = 0.008690
Freq Percentage = 99.935417
Entitlement Used Percentage = 0.869017
Entitlement Busy Percentage = 0.312826
Idle Cycles Donated Percentage = 0.000000
Busy Cycles Donated Percentage = 0.000000
Idle Cycles Stolen Percentage = 0.000000
Busy Cycles Stolen Percentage = 0.000000
User percentage for logical cpu in ticks = 0.000000
Sytem percentage for logical cpu in ticks= 0.082034
Idle percentage for logical cpu in ticks= 99.917969
Wait percentage for logical cpu in ticks= 0.000000
delta time in milliseconds = 4980使用
perfstat_cpu_util 接口计算每个 CPU 的系统利用率和 CPU 利用率的示例代码如下所示:#include <libperfstat.h>
#define PERIOD 5
void main()
{
perfstat_rawdata_t data;
perfstat_cpu_util_t *util;
perfstat_cpu_t *newt,*oldt;
perfstat_id_t id;
int i,cpu_count,rc;
/* Check how many perfstat_cpu_t structures are available */
cpu_count = perfstat_cpu(NULL, NULL,sizeof(perfstat_cpu_t),0);
/* check for error */
if(cpu_count <= 0)
{
perror("Error in perfstat_cpu");
exit(-1);
}
/* allocate enough memory */
oldt = (perfstat_cpu_t *)calloc(cpu_count,sizeof(perfstat_cpu_t));
if(oldt == NULL)
{
perror("Memory Allocation Error");
exit(-1);
}
/* set name to first cpu */
strcpy(id.name,FIRST_CPU);
/* ask to get all the structures available in one call */
rc = perfstat_cpu(&id, oldt, sizeof(perfstat_cpu_t), cpu_count);
/* check for error */
if(rc <=0)
{
perror("Error in perfstat_cpu");
exit(-1);
}
data.type = UTIL_CPU;
data.prevstat= oldt;
data.sizeof_data = sizeof(perfstat_cpu_t);
data.prev_elems = cpu_count;
sleep(PERIOD);
/* Check how many perfstat_cpu_t structures are available after a defined period */
cpu_count = perfstat_cpu(NULL, NULL,sizeof(perfstat_cpu_t),0);
/* Check for error */
if(cpu_count <= 0)
{
perror("Error in perfstat_cpu");
exit(-1);
}
data.cur_elems = cpu_count;
if(data.prev_elems != data.cur_elems)
{
perror("The number of CPUs has become different for defined period");
exit(-1);
}
/* allocate enough memory */
newt = (perfstat_cpu_t *)calloc(cpu_count,sizeof(perfstat_cpu_t));
util = (perfstat_cpu_util_t *)calloc(cpu_count,sizeof(perfstat_cpu_util_t));
if(newt == NULL || util == NULL)
{
perror("Memory Allocation Error");
exit(-1);
}
data.curstat = newt;
rc = perfstat_cpu(&id, newt, sizeof(perfstat_cpu_t), cpu_count);
if(rc <= 0)
{
perror("Error in perfstat_cpu");
exit(-1);
}
/* Calculate CPU Utilization Metrics*/
rc = perfstat_cpu_util(&data, util, sizeof(perfstat_cpu_util_t), cpu_count);
if(rc <= 0)
{
perror("Error in perfstat_cpu_util");
exit(-1);
}
printf("========= Per CPU Utilization Metrics =========\n");
printf("Utilization Metrics for a period of %d seconds\n",PERIOD);
printf("===============================================\n");
for ( i = 0;i<cpu_count;i++)
{
printf("Utilization metrics for CPU-ID = %s\n",util[i].cpu_id);
printf("User Percentage = %f\n",util[i].user_pct);
printf("System Percentage = %f\n",util[i].kern_pct);
printf("Idle Percentage = %f\n",util[i].idle_pct);
printf("Wait Percentage = %f\n",util[i].wait_pct);
printf("Physical Busy = %f\n",util[i].physical_busy);
printf("Physical Consumed = %f\n",util[i].physical_consumed);
printf("Freq Percentage = %f\n",util[i].freq_pct);
printf("Entitlement Used Percentage = %f\n",util[i].entitlement_pct);
printf("Entitlement Busy Percentage = %f\n",util[i].busy_pct);
printf("Idle Cycles Donated Percentage = %f\n",util[i].idle_donated_pct);
printf("Busy Cycles Donated Percentage = %f\n",util[i].busy_donated_pct);
printf("Idle Cycles Stolen Percentage = %f\n",util[i].idle_stolen_pct);
printf("Busy Cycles Stolen Percentage = %f\n",util[i].busy_stolen_pct);
printf("system percentage for logical cpu in ticks = %f\n",util[i].l_kern_pct);
printf("idle percentage for logical cpu in ticks = %f\n",util[i].l_idle_pct);
printf("wait percentage for logical cpu in ticks = %f\n",util[i].l_wait_pct);
printf("delta time in milliseconds = %llu \n",util[i].delta_time);
printf("\n\n");
}
printf("===========================================\n");
}========= Per CPU Utilization Metrics =========
Utilization Metrics for a period of 5 seconds
===============================================
Utilization metrics for CPU-ID = cpu0
User Percentage = 14.850358
System Percentage = 63.440376
Idle Percentage = 21.709267
Wait Percentage = 0.000000
Physical Busy = 0.003085
Physical Consumed = 0.003941
Freq Percentage = 99.975967
Entitlement Used Percentage = 0.394055
Entitlement Busy Percentage = 0.308508
Idle Cycles Donated Percentage = 0.000000
Busy Cycles Donated Percentage = 0.000000
Idle Cycles Stolen Percentage = 0.000000
Busy Cycles Stolen Percentage = 0.000000
system percentage for logical cpu in ticks = 0.000000
idle percentage for logical cpu in ticks = 100.000000
wait percentage for logical cpu in ticks = 0.000000
delta time in milliseconds = 4999
Utilization metrics for CPU-ID = cpu1
User Percentage = 0.000000
System Percentage = 4.720662
Idle Percentage = 95.279335
Wait Percentage = 0.000000
Physical Busy = 0.000065
Physical Consumed = 0.001371
Freq Percentage = 99.938919
Entitlement Used Percentage = 0.137110
Entitlement Busy Percentage = 0.006472
Idle Cycles Donated Percentage = 0.000000
Busy Cycles Donated Percentage = 0.000000
Idle Cycles Stolen Percentage = 0.000000
Busy Cycles Stolen Percentage = 0.000000
system percentage for logical cpu in ticks = 0.000000
idle percentage for logical cpu in ticks = 100.000000
wait percentage for logical cpu in ticks = 0.000000
delta time in milliseconds = 5000
Utilization metrics for CPU-ID = cpu2
User Percentage = 0.000000
System Percentage = 5.848962
Idle Percentage = 94.151039
Wait Percentage = 0.000000
Physical Busy = 0.000079
Physical Consumed = 0.001348
Freq Percentage = 99.900566
Entitlement Used Percentage = 0.134820
Entitlement Busy Percentage = 0.007886
Idle Cycles Donated Percentage = 0.000000
Busy Cycles Donated Percentage = 0.000000
Idle Cycles Stolen Percentage = 0.000000
Busy Cycles Stolen Percentage = 0.000000
system percentage for logical cpu in ticks = 0.000000
idle percentage for logical cpu in ticks = 100.000000
wait percentage for logical cpu in ticks = 0.000000
delta time in milliseconds = 5000
Utilization metrics for CPU-ID = cpu3
User Percentage = 0.000000
System Percentage = 4.644570
Idle Percentage = 95.355431
Wait Percentage = 0.000000
Physical Busy = 0.000061
Physical Consumed = 0.001312
Freq Percentage = 99.925430
Entitlement Used Percentage = 0.131174
Entitlement Busy Percentage = 0.006092
Idle Cycles Donated Percentage = 0.000000
Busy Cycles Donated Percentage = 0.000000
Idle Cycles Stolen Percentage = 0.000000
Busy Cycles Stolen Percentage = 0.000000
system percentage for logical cpu in ticks = 0.000000
idle percentage for logical cpu in ticks = 100.000000
wait percentage for logical cpu in ticks = 0.000000
delta time in milliseconds = 5000
Utilization metrics for CPU-ID = cpu4
User Percentage = 0.000000
System Percentage = 55.325123
Idle Percentage = 44.674877
Wait Percentage = 0.000000
Physical Busy = 0.000153
Physical Consumed = 0.000276
Freq Percentage = 99.927551
Entitlement Used Percentage = 0.027605
Entitlement Busy Percentage = 0.015273
Idle Cycles Donated Percentage = 0.000000
Busy Cycles Donated Percentage = 0.000000
Idle Cycles Stolen Percentage = 0.000000
Busy Cycles Stolen Percentage = 0.000000
system percentage for logical cpu in ticks = 0.000000
idle percentage for logical cpu in ticks = 100.000000
wait percentage for logical cpu in ticks = 0.000000
delta time in milliseconds = 4999
Utilization metrics for CPU-ID = cpu5
User Percentage = 0.000000
System Percentage = 1.854463
Idle Percentage = 98.145538
Wait Percentage = 0.000000
Physical Busy = 0.000002
Physical Consumed = 0.000113
Freq Percentage = 99.612183
Entitlement Used Percentage = 0.011326
Entitlement Busy Percentage = 0.000210
Idle Cycles Donated Percentage = 0.000000
Busy Cycles Donated Percentage = 0.000000
Idle Cycles Stolen Percentage = 0.000000
Busy Cycles Stolen Percentage = 0.000000
system percentage for logical cpu in ticks = 0.255102
idle percentage for logical cpu in ticks = 99.744896
wait percentage for logical cpu in ticks = 0.000000
delta time in milliseconds = 3913
Utilization metrics for CPU-ID = cpu6
User Percentage = 0.000000
System Percentage = 1.776852
Idle Percentage = 98.223145
Wait Percentage = 0.000000
Physical Busy = 0.000002
Physical Consumed = 0.000115
Freq Percentage = 99.475967
Entitlement Used Percentage = 0.011506
Entitlement Busy Percentage = 0.000204
Idle Cycles Donated Percentage = 0.000000
Busy Cycles Donated Percentage = 0.000000
Idle Cycles Stolen Percentage = 0.000000
Busy Cycles Stolen Percentage = 0.000000
system percentage for logical cpu in ticks = 0.255102
idle percentage for logical cpu in ticks = 99.744896
wait percentage for logical cpu in ticks = 0.000000
delta time in milliseconds = 3912
Utilization metrics for CPU-ID = cpu7
User Percentage = 0.000000
System Percentage = 2.138275
Idle Percentage = 97.861725
Wait Percentage = 0.000000
Physical Busy = 0.000002
Physical Consumed = 0.000112
Freq Percentage = 99.593727
Entitlement Used Percentage = 0.011205
Entitlement Busy Percentage = 0.000240
Idle Cycles Donated Percentage = 0.000000
Busy Cycles Donated Percentage = 0.000000
Idle Cycles Stolen Percentage = 0.000000
Busy Cycles Stolen Percentage = 0.000000
system percentage for logical cpu in ticks = 0.255102
idle percentage for logical cpu in ticks = 99.744896
wait percentage for logical cpu in ticks = 0.000000
delta time in milliseconds = 3912