[Enhancement] the algorithm of load issue on Windows

[mercyblitz]

@alphatan

---

My research of this problem.

According to this answer of the question "Alternate of getSystemLoadAverage() for Windows?", the method getSystemLoadAverage of java.lang.management.OperatingSystemMXBean would return -1 in Windows.

It'd be suggested to use com.sun.management.OperatingSystemMXBean and its getSystemCpuLoad() and getProcessCpuLoad() instead.

[diecui1202]

@mercyblitz Any progress with this ?