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From: Anonymous <swell.k@gmail.com>
To: Atom Smasher <atom@smasher.org>
References: <1007142345320.5546@smasher>
Date: Thu, 15 Jul 2010 04:06:44 +0400
In-Reply-To: <1007142345320.5546@smasher> (Atom Smasher's message of "Wed, 14
	Jul 2010 23:49:07 +1200 (NZST)")
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Cc: freebsd-hackers@freebsd.org
Subject: Re: sysctl way too slow
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Atom Smasher <atom@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...