From: Benoit Daloze <eregontp@...>
Date: 2010-08-23T06:11:09+09:00
Subject: Re: YAML::dump slow

On 22 August 2010 16:54, Piotr Szotkowski <chastell@chastell.net> wrote:
> Michael Fellinger:
>
>> If you're on 1.9.2, you could try the new YAML library psych:
>> iota ~ % time ruby -rpsych -e 'Psych.load(Psych.dump(Dir["/sys/**/*"]))'
>> 1.20s user 0.07s system 99% cpu 1.283 total
>
> What exactly do I need to have Psych on an Ubuntu/rvm install?
>
> chastell@devielle:~$ ruby -vrpsych -e ''
> ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-linux]
> <internal:lib/rubygems/custom_require>:29:in `require': no such file to load -- psych (LoadError)
>  from <internal:lib/rubygems/custom_require>:29:in `require'
> chastell@devielle:~$
>
> (Note: I have libyaml-dev installed.)
>
> — Piotr Szotkowski

I had trouble also with rvm on OSX, my ruby did not find psych.so.
I just had to reinstall, after installing libyaml in a usual path (/usr/local).

I did have before libyaml with macports, but then you have to pass
configure options like:
rvm install ruby-1.9.2-head -C --with-libyaml-dir=/opt/local

About Ubuntu, I believe it installs in a standard place, so you just
need to install it again.

(psych extension is simply not compiled if it does not find libyaml (yaml.h))

B.D.