Why to not use hub with RubyGems

gistfile1.txt

# No RubyGems
$ time hub version
git version 1.6.0
hub version 0.2.0

real	0m0.047s
user	0m0.015s
sys	0m0.028s

# With RubyGems
$ time hub version
git version 1.6.0
hub version 0.2.0

real	0m0.438s
user	0m0.352s
sys	0m0.089s

# If you have the current git branch in your bash prompt,
# you're going to notice the extra half second before it
# renders.

$ time hub version
git version 1.7.7.2
hub version 1.7.0

real  0m0.085s
user  0m0.060s
sys   0m0.016s

$ ruby -v
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-linux]

$ which hub
/home/chastell/.rvm/gems/ruby-1.9.3-p0@global/bin/hub

@chastell How did reduce the startup time? can you show us your output of cat $(type -P hub)

$ cat $(type -P hub)
#!/home/chastell/.rvm/rubies/ruby-1.9.3-p0/bin/ruby
#
# This file was generated by RubyGems.
#
# The application 'hub' is installed as part of a gem, and
# this file is here to facilitate running it.
#

require 'rubygems'

version = ">= 0"

if ARGV.first =~ /^_(.*)_$/ and Gem::Version.correct? $1 then
  version = $1
  ARGV.shift
end

gem 'hub', version
load Gem.bin_path('hub', 'hub', version)

Note that I have only 14 gems in my global gemset, so the require 'rubygems' call is cheap. Also note that it’s Ruby 1.9.3, which much faster require handling in general.

@chastell Thanks for the info, I didn't know the number of gems slowed down the load time, good to know that ruby 1.9.3 has some fixes.

it's still slow.

# No Rubygems
$ time hub version
> 0.03s user 0.01s system 49% cpu 0.093 total 

# With Rubygems
$ time hub version
> 0.21s user 0.01s system 95% cpu 0.229 total

$ ruby --version
> ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-linux]

$ gem --version
> 1.8.11

$ gem list | wc -l
> 356

tested in ArchLinux with SSD.

Personal Conclusion

Standalone version 3 times faster than rubygems equivalent.

Environment

sisop ubuntu 12.04 in a virtual machine
ruby version 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]
gem version 2.0.2
git version 1.7.9.5
hub version 1.10.5

Tests

# No Rubygems
time hub version
#=> real 0m0.096s  user 0m0.060s  sys 0m0.016s

# With Rubygems
time hub version
#=> real 0m0.266s  user 0m0.208s  sys 0m0.008s

Gogdghjpgg

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