# blade create cpu load

创建 CPU 负载的混沌实验

## 介绍

CPU 相关的混沌实验包含 CPU 满载，可以指定核数、具体核满载或者总 CPU 负载百分比。

旨在 CPU 在特定负载下，验证服务质量、监控告警、流量调度、弹性伸缩等能力。

load、fullload、fl 命令都可以，即 `blade create cpu load`、`blade create cpu fullload` 或 `blade create cpu fl`

执行命令：

```
blade create cpu load [flags]
```

## 参数

```
--timeout string   设定运行时长，单位是秒，通用参数
--cpu-count string     指定 CPU 满载的个数
--cpu-list string      指定 CPU 满载的具体核，核索引从 0 开始 (0-3 or 1,3)
--cpu-percent string   指定 CPU 负载百分比，取值在 0-100
```

## 案例

```
# 创建 CPU 满载实验
blade create cpu load

# 返回结果如下
{"code":200,"success":true,"result":"beeaaf3a7007031d"}

# code 的值等于 200 说明执行成功，其中 result 的值就是 uid。使用 top 命令验证实验效果
Tasks: 100 total,   2 running,  98 sleeping,   0 stopped,   0 zombie
%Cpu0  : 21.3 us, 78.7 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu1  : 20.9 us, 79.1 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu2  : 20.5 us, 79.5 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu3  : 20.9 us, 79.1 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st

# 4 核都满载，实验生效，销毁实验
blade destroy beeaaf3a7007031d

# 返回结果如下
{"code":200,"success":true,"result":"command: cpu load --help false --debug false"}

# 指定随机两个核满载
blade create cpu load --cpu-count 2

# 使用 top 命令验证结果如下，实验生效
Tasks: 100 total,   2 running,  98 sleeping,   0 stopped,   0 zombie
%Cpu0  : 17.9 us, 75.1 sy,  0.0 ni,  7.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu1  :  3.0 us,  6.7 sy,  0.0 ni, 90.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu2  :  0.7 us,  0.7 sy,  0.0 ni, 98.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu3  : 19.7 us, 80.3 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st

# 指定索引是 0，3 的核满载，核的索引从 0 开始
blade create cpu load --cpu-list 0,3

# 使用 top 命令验证结果如下，实验生效
Tasks: 101 total,   2 running,  99 sleeping,   0 stopped,   0 zombie
%Cpu0  : 23.5 us, 76.5 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu1  :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu2  :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu3  : 20.9 us, 79.1 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st

# 指定索引 1 到 3 的核满载
blade create cpu load --cpu-list 1-3

Tasks: 102 total,   4 running,  98 sleeping,   0 stopped,   0 zombie
%Cpu0  :  2.4 us,  7.1 sy,  0.0 ni, 90.2 id,  0.0 wa,  0.0 hi,  0.3 si,  0.0 st
%Cpu1  : 20.0 us, 80.0 sy,  0.0 ni,  0.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu2  : 15.7 us, 78.7 sy,  0.0 ni,  5.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu3  : 19.1 us, 78.9 sy,  0.0 ni,  2.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st

# 指定百分比负载
blade create cpu load --cpu-percent 60

# 可以看到 CPU 总的使用率达到 60%， 空闲 40%
Tasks: 100 total,   1 running,  99 sleeping,   0 stopped,   0 zombie
%Cpu(s): 15.8 us, 44.1 sy,  0.0 ni, 40.0 id,  0.0 wa,  0.0 hi,  0.1 si,  0.0 st
```

## 实现原理

利用消耗CPU时间片来做。详见代码：[burncpu](https://github.com/chaosblade-io/chaosblade-exec-os/blob/master/exec/bin/burncpu/burncpu.go)

## 常见问题


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