From: Kent Sibilev <ksruby@...>
Date: 2005-06-28T05:00:52+09:00
Subject: Re: Caching eval() for reuse to gain performance ?

Care to explain? The idea was that you don't know beforehand what code
gets called by proc.

I don't like both approaches, but:

$ cat eval_cache.rb
require 'benchmark'

c = '@a + @b'
@a, @b = 1, 2
p1 = lambda { eval c }
p2 = eval "lambda { #{c} }"

Benchmark.bm do |x|
  x.report do
    100000.times {p1.call}
  end
  x.report do
    100000.times {p2.call}
  end
end
$ ruby eval_cache.rb

      user     system      total        real
  0.480000   0.000000   0.480000 (  0.480000)
  0.160000   0.000000   0.160000 (  0.161000)

Kent.

On 6/27/05, Adam Sanderson <netghost@gmail.com> wrote:
> That won't gain you any effiecency.  Assuming that you're doing the
> same statement for each record perhaps you'd be better off with
> something along the lines of:
> 
> irb(main):001:0> p = proc{|a,b| a+b }
> => #<Proc:0x000583ec@(irb):1>
> irb(main):002:0> p.call(1,5)
> => 6
> 
> You might just need to rethink your approach a little.
>   .adam sanderson
> 
> 
>