本软件包是一款轻量级的系统负荷监视器，用户可以在必要的时候 dump 出来，系统的历史负荷情况，方便进行性能分析
参考 menuconfig 配置描述
软件包默认使用 RT-Thread 自带的系统初始化方式，进行自动初始化( sys_load_monitor_init )。如果系统已经开启了自动初始化功能，那么无需再调用初始化代码。
可以通过下面两种方式进行 dump:
- 调用
sys_load_monitor_dump函数 - shell 中执行
sys_load命令
执行后，近期的系统负荷将会被输出到控制台中，大致情况如下：
msh />sys_load
RUNNING | 31 23 15 7 0 | ready thread list..
-------- | -------------------------------- | -------------------
thread-j | * * * * $ | thread-k(20) thread-m(24) thread-n(26) thread-o(28)
thread-e | * * $ | thread-l(22) thread-m(24)
thread-h | * * * * * $ | thread-k(20) thread-l(22) thread-m(24) thread-n(26)
thread-b | * * * $ | thread-j(18) thread-l(22) thread-o(28)
thread-d | * * * * * * $ | thread-e(08) utest (20) thread-l(22) thread-m(24)
thread-f | * * * * * * * $ | thread-g(12) thread-h(14) utest (20) thread-l(22)
thread-a | * * * * * * $ | thread-j(18) thread-k(20) utest (20) thread-l(22)
thread-b | * * * * * $ | utest (20) thread-l(22) thread-m(24) thread-n(26)
thread-g | * * * * * $ | utest (20) thread-l(22) thread-m(24) thread-n(26)
thread-h | * * * * * * * $ | thread-i(16) thread-j(18) utest (20) thread-l(22)
thread-f | * * * * * $ | thread-i(16) thread-l(22) thread-m(24) thread-n(26)
thread-i | * $ | thread-o(28)
thread-k | * * * * $ | thread-l(22) thread-m(24) thread-n(26) thread-o(28)
thread-b | * * * * * $ | thread-j(18) tshell (20) thread-l(22) thread-m(24)
thread-e | * * * * * $ | thread-k(20) thread-l(22) thread-m(24) thread-n(26)
thread-l | * * * $ | thread-m(24) thread-n(26) thread-o(28)
thread-m | $ |
thread-h | * $ | thread-o(28)
tshell | * * * $ | thread-k(20) thread-m(24) thread-n(26) thread-o(28)
msh /> 每行记录了一条系统的历史线程运行情况
- 第一列：当前执行线程的名称
- 中间列：当前线程的调用状态，按照优先级进行排列。
$: 代表当前正在运行线程的优先级*: 代表处于就绪状态的线程优先级
- 第三列：就绪列表中的线程列表