Improved task scheduling for parallel and distributed compilation based on memory/cpu usage

[waruqi]

Is your feature request related to a problem? Please describe.

• parallel compilation
• distributed compilation
• get memory usage info
• get cpu usage info

With limited memory resources inside docker, ensure that the project can be compiled successfully.

Describe the solution you'd like

...

Describe alternatives you've considered

No response

Additional context

No response

[waruqi]

get meminfo

$ xmake l os.meminfo
{
  availsize = 4755, -- MB
  totalsize = 16381, -- MB
  usagerate = 0.7097246810329, -- 70%
  pagesize = 4096 -- bytes
}

[waruqi]

get cpu info

$ xmake l os.cpuinfo
{
  model = 142,
  family = 6,
  model_name = "Intel(R) Core(TM) i7-8569U CPU @ 2.80GHz",
  usagerate = 0.31167268753052,
  features = "fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clfsh ds a
cpi mmx fxsr sse sse2 ss htt tm pbe sse3 pclmulqdq dtes64 mon dscpl vmx est tm2 ssse3 fma cx16 t
pr pdcm sse4_1 sse4_2 x2apic movbe popcnt aes pcid xsave osxsave seglim64 tsctmr avx1_0 rdrand f
16c",
  march = "Kaby Lake",
  ncpu = 8,
  vendor = "GenuineIntel"
}

[waruqi]

parallel compilation

I don't know how to control it based on memory usage. Because the memory usage is very low before multiple parallel tasks are started.