Facter::Util::Resolution#which memoization benchmark

which_bm.rb

#!/usr/bin/env ruby

require 'facter/util/resolution'
require 'benchmark'

@foo = {}
def wrap_which(bin)
    if @foo.has_key?(bin)
        return @foo[bin]
    else
        bob = Facter::Util::Resolution.which(bin) 
        @foo[bin] = bob
        return bob
    end
end

@bar = {}
def wrap_which_sym(bin)
    sym = bin.to_sym
    if @bar.has_key?(sym)
        return @bar[sym]
    else
        bob = Facter::Util::Resolution.which(bin) 
        @bar[sym] = bob
        return bob
    end
end

n = 10_000
Benchmark.bm do |b|
    b.report {
        for i in 1 .. n
            Facter::Util::Resolution.which('ls') 
        end
    }
    b.report {
        for i in 1 .. n
            wrap_which('ls') 
        end
    }
    b.report {
        for i in 1 .. n
            wrap_which_sym('ls') 
        end
    }
end