sysctl way too slow

[Anonymous]

Atom Smasher <atom at smasher.org> writes:

> http://smasher.org/tmp/zsh-bsd-sysctl-slow.png
>
> is there a way to get this information that doesn't take so long?

If you only need sysctl values for fancy prompt then cache them inside
variables, e.g.

  PROMPT='($hw_acpi_battery_life, $hw_acpi_battery_time, $hw_acpi_battery_state) %# '

  PERIOD=30
  setopt promptsubst
  periodic_functions+=(sysctl-to-var)

  sysctl-to-var() {
      set -- hw.acpi.battery.

      for i in $(sysctl -N $@); do
          eval ${i:gs/./_/:gs/%//}='$(sysctl -n $i)'
      done
  }

To not pollute global scope using one associative array for sysctls may
be better.

>
> the same info is available on linux via /sys and /proc and on
> comparable hardware, i can get the info about 100x faster.
>
> thanks...