root_shell

# echo $GEM_PATH

# echo $GEM_HOME

# which ruby
/opt/rubies/ruby-2.1.3/bin/ruby

# which gem
/opt/rubies/ruby-2.1.3/bin/gem

# gem --version
2.2.2

# gem list | wc -l
125


# ruby-prof -m1 --exclude-common-cycles ./test.rb 
Measure Mode: wall_time
Thread ID: 69960597197620
Fiber ID: 69960601582640
Total: 0.436150
Sort by: self_time

 %self      total      self      wait     child     calls  name
  3.75      0.021     0.016     0.000     0.001      325   Module#class_eval
  2.71      0.012     0.012     0.000     0.000        1   JSON::Ext::Parser#parse
  2.17      0.087     0.009     0.000     0.078     1909   MIME::Type#init_with
  2.12      0.009     0.009     0.000     0.000     3818   Regexp#match
  1.93      0.011     0.008     0.000     0.002    27381   Hash#[]
  1.89      0.008     0.008     0.000     0.000    11454   String#gsub!
  1.16      0.098     0.005     0.000     0.093     1909   MIME::Type#initialize
  1.10      0.013     0.005     0.000     0.008     1909   <Class::MIME::Type>#i18n_key

test.rb

#!/usr/bin/env ruby

require 'fog'

user_gem_clean

$ gem clean
Cleaning up installed gems...
Attempting to uninstall rest_client-1.7.3
Executables and scripts will remain installed.
Successfully uninstalled rest_client-1.7.3
Attempting to uninstall rack-1.5.2
Successfully uninstalled rack-1.5.2
Attempting to uninstall netrc-0.7.7
Successfully uninstalled netrc-0.7.7
Attempting to uninstall netrc-0.7.9

You have requested to uninstall the gem:
	netrc-0.7.9

rest_client-1.8.3 depends on netrc (~> 0.7.7)
If you remove this gem, these dependencies will not be met.
Continue with Uninstall? [yN]  
Unable to uninstall netrc-0.7.9:
	Gem::DependencyRemovalException: Uninstallation aborted due to dependent gem(s)
Attempting to uninstall minitest-5.4.1
Successfully uninstalled minitest-5.4.1
Attempting to uninstall httpclient-2.4.0
Successfully uninstalled httpclient-2.4.0
Attempting to uninstall highline-1.6.21
Successfully uninstalled highline-1.6.21
Attempting to uninstall gitdis-0.0.2.1
Successfully uninstalled gitdis-0.0.2.1
Attempting to uninstall gitdis-0.1.0.1
Successfully uninstalled gitdis-0.1.0.1
Attempting to uninstall gitdis-0.1.0.2
Successfully uninstalled gitdis-0.1.0.2
Attempting to uninstall gitdis-0.1.0.3
Successfully uninstalled gitdis-0.1.0.3
Attempting to uninstall gitdis-0.1.0.4
Successfully uninstalled gitdis-0.1.0.4
Attempting to uninstall gitdis-0.1.1.2
Successfully uninstalled gitdis-0.1.1.2
Attempting to uninstall gitdis-0.1.1.3
Successfully uninstalled gitdis-0.1.1.3
Attempting to uninstall gitdis-0.1.1.4
Successfully uninstalled gitdis-0.1.1.4
Attempting to uninstall gitdis-0.1.1.5
Successfully uninstalled gitdis-0.1.1.5
Attempting to uninstall gitdis-0.1.1.6
Successfully uninstalled gitdis-0.1.1.6
Attempting to uninstall gitdis-0.1.1.7
Successfully uninstalled gitdis-0.1.1.7
Attempting to uninstall redis-3.1.0
Successfully uninstalled redis-3.1.0
Attempting to uninstall fog-terremark-0.0.3
Successfully uninstalled fog-terremark-0.0.3
Attempting to uninstall fog-softlayer-0.3.25
Successfully uninstalled fog-softlayer-0.3.25
Attempting to uninstall fog-sakuracloud-0.1.1
Successfully uninstalled fog-sakuracloud-0.1.1
Attempting to uninstall fog-core-1.25.0
Successfully uninstalled fog-core-1.25.0
Attempting to uninstall fog-1.25.0
Successfully uninstalled fog-1.25.0
Attempting to uninstall fog-1.28.0
Successfully uninstalled fog-1.28.0
Attempting to uninstall fog-serverlove-0.1.1
Successfully uninstalled fog-serverlove-0.1.1
Attempting to uninstall fog-storm_on_demand-0.1.0
Successfully uninstalled fog-storm_on_demand-0.1.0
Attempting to uninstall fog-ecloud-0.0.2
Successfully uninstalled fog-ecloud-0.0.2
Attempting to uninstall fog-terremark-0.0.4
Successfully uninstalled fog-terremark-0.0.4
Attempting to uninstall fog-vmfusion-0.0.1
Successfully uninstalled fog-vmfusion-0.0.1
Attempting to uninstall fog-voxel-0.0.2
Successfully uninstalled fog-voxel-0.0.2
Attempting to uninstall fog-profitbricks-0.0.1
Successfully uninstalled fog-profitbricks-0.0.1
Attempting to uninstall fog-radosgw-0.0.3
Successfully uninstalled fog-radosgw-0.0.3
Attempting to uninstall fog-sakuracloud-1.0.0
Successfully uninstalled fog-sakuracloud-1.0.0
Attempting to uninstall fog-softlayer-0.4.1
Successfully uninstalled fog-softlayer-0.4.1
Attempting to uninstall fog-brightbox-0.7.0
Successfully uninstalled fog-brightbox-0.7.0
Attempting to uninstall fog-aws-0.1.1
Successfully uninstalled fog-aws-0.1.1
Attempting to uninstall fog-xml-0.1.1
Successfully uninstalled fog-xml-0.1.1
Attempting to uninstall nokogiri-1.6.5
Successfully uninstalled nokogiri-1.6.5
Attempting to uninstall mini_portile-0.6.1
Successfully uninstalled mini_portile-0.6.1
Attempting to uninstall fog-json-1.0.0
Successfully uninstalled fog-json-1.0.0
Attempting to uninstall fog-core-1.29.0
Successfully uninstalled fog-core-1.29.0
Attempting to uninstall ffi-yajl-1.1.0
Successfully uninstalled ffi-yajl-1.1.0
Attempting to uninstall libyajl2-1.0.1
Successfully uninstalled libyajl2-1.0.1
Attempting to uninstall excon-0.42.0
Successfully uninstalled excon-0.42.0
Attempting to uninstall excon-0.45.1
Successfully uninstalled excon-0.45.1
Attempting to uninstall colorize-0.7.3
Successfully uninstalled colorize-0.7.3
Attempting to uninstall colorize-0.7.5
Successfully uninstalled colorize-0.7.5
Attempting to uninstall chef-11.16.2
Executables and scripts will remain installed.
Successfully uninstalled chef-11.16.2
Attempting to uninstall chef-12.1.2
Successfully uninstalled chef-12.1.2
Attempting to uninstall serverspec-2.14.0
Successfully uninstalled serverspec-2.14.0
Attempting to uninstall specinfra-2.27.0
Successfully uninstalled specinfra-2.27.0
Attempting to uninstall multi_json-1.10.1
Successfully uninstalled multi_json-1.10.1
Attempting to uninstall rspec_junit_formatter-0.2.0
Successfully uninstalled rspec_junit_formatter-0.2.0
Attempting to uninstall rspec-3.1.0
Successfully uninstalled rspec-3.1.0
Attempting to uninstall rspec-expectations-3.2.0
Successfully uninstalled rspec-expectations-3.2.0
Attempting to uninstall rspec-core-3.2.2
Successfully uninstalled rspec-core-3.2.2
Attempting to uninstall chef-zero-4.0
Successfully uninstalled chef-zero-4.0
Attempting to uninstall rack-1.6.0
Successfully uninstalled rack-1.6.0
Attempting to uninstall highline-1.7.1
Successfully uninstalled highline-1.7.1
Attempting to uninstall net-ssh-multi-1.2.0
Successfully uninstalled net-ssh-multi-1.2.0
Attempting to uninstall net-ssh-2.9.1
Successfully uninstalled net-ssh-2.9.1
Attempting to uninstall ohai-8.2.0
Successfully uninstalled ohai-8.2.0
Attempting to uninstall ffi-1.9.3
Successfully uninstalled ffi-1.9.3
Attempting to uninstall systemu-2.6.4
Successfully uninstalled systemu-2.6.4
Attempting to uninstall mime-types-2.4.3
Successfully uninstalled mime-types-2.4.3
Attempting to uninstall bundler-1.9.2
Successfully uninstalled bundler-1.9.2
Attempting to uninstall awesome_print-1.2.0
Successfully uninstalled awesome_print-1.2.0
Attempting to uninstall activesupport-4.1.6
Successfully uninstalled activesupport-4.1.6
Attempting to uninstall thread_safe-0.3.4
Successfully uninstalled thread_safe-0.3.4
Attempting to uninstall i18n-0.6.11
Successfully uninstalled i18n-0.6.11
Attempting to uninstall CFPropertyList-2.2.8
Successfully uninstalled CFPropertyList-2.2.8
Attempting to uninstall rspec-mocks-3.1.0
Successfully uninstalled rspec-mocks-3.1.0
Attempting to uninstall rspec-expectations-3.1.1
Successfully uninstalled rspec-expectations-3.1.1
Attempting to uninstall rspec-core-3.1.3
Successfully uninstalled rspec-core-3.1.3
Attempting to uninstall rest-client-1.6.7
Successfully uninstalled rest-client-1.6.7
Attempting to uninstall ohai-7.4.0
Successfully uninstalled ohai-7.4.0
Attempting to uninstall chef-zero-2.2
Successfully uninstalled chef-zero-2.2
Attempting to uninstall rspec-support-3.1.0
Successfully uninstalled rspec-support-3.1.0
Attempting to uninstall mixlib-shellout-1.4.0
Successfully uninstalled mixlib-shellout-1.4.0
Attempting to uninstall ffi-yajl-1.4.0
Successfully uninstalled ffi-yajl-1.4.0
Clean Up Complete

$ time ruby -rfog -e "puts 'hi'"
hi

real	0m0.470s
user	0m0.392s
sys	0m0.076s

$ ruby-prof -m1 --exclude-common-cycles /tmp/test.rb
Measure Mode: wall_time
Thread ID: 70001020048180
Fiber ID: 70001024420340
Total: 0.616044
Sort by: self_time

 %self      total      self      wait     child     calls  name
  3.32      0.020     0.020     0.000     0.000    17518   <Class::File>#file?
  2.30      0.014     0.014     0.000     0.000    56593   Gem::StubSpecification#name
  2.23      0.014     0.014     0.000     0.000    11778   <Class::File>#join
  2.18      0.039     0.013     0.000     0.025     1103   Enumerable#find_all
  2.07      0.031     0.013     0.000     0.019    19649   Gem::StubSpecification#activated?
  1.96      0.089     0.012     0.000     0.077     1909   MIME::Type#init_with
  1.74      0.011     0.011     0.000     0.000        1   JSON::Ext::Parser#parse
  1.48      0.048     0.009     0.000     0.038    11950  *Enumerable#any?
  1.36      0.013     0.008     0.000     0.001      325   Module#class_eval
  1.35      0.008     0.008     0.000     0.000    11454   String#gsub!
  1.30      0.008     0.008     0.000     0.000     5866   <Module::Gem>#default_dir
  1.27      0.010     0.008     0.000     0.002    27381   Hash#[]
  1.18      0.015     0.007     0.000     0.007     5594   Gem::BasicSpecification#full_require_paths
  1.07      0.148     0.007     0.000     0.141      203   Enumerable#find
  1.06      0.019     0.007     0.000     0.013     5734   Gem::Version#<=>
  1.03      0.008     0.006     0.000     0.001     1964   Hash#merge

* indicates recursively called methods

user_gem_list

$ gem list

*** LOCAL GEMS ***

activesupport (4.2.1, 4.1.6)
addressable (2.3.8)
awesome_print (1.6.1, 1.2.0)
berkshelf (3.2.4)
berkshelf-api-client (1.2.1)
bigdecimal (1.2.4)
binding_of_caller (0.7.2)
buff-config (1.0.1)
buff-extensions (1.0.0)
buff-ignore (1.1.1)
buff-ruby_engine (0.1.0)
buff-shell_out (0.2.0)
buildar (2.0.2.1)
builder (3.2.2)
bundler (1.10.1, 1.9.2)
celluloid (0.16.0)
celluloid-io (0.16.2)
CFPropertyList (2.3.1, 2.2.8)
chef (12.3.0, 12.1.2, 11.16.2)
chef-zero (4.2.1, 4.0, 2.2)
cleanroom (1.0.0)
coderay (1.1.0)
colorize (0.7.7, 0.7.5, 0.7.3)
debug_inspector (0.0.2)
deep_merge (1.0.1)
dep-selector-libgecode (1.0.2)
dep_selector (1.0.3)
diff-lcs (1.2.5)
domain_name (0.5.24)
erubis (2.7.0)
ethon (0.7.3)
excon (0.45.3, 0.45.1, 0.42.0)
faraday (0.9.1)
ffi (1.9.8, 1.9.3)
ffi-yajl (2.2.0, 1.4.0, 1.1.0)
fission (0.5.0)
fog (1.30.0, 1.28.0, 1.25.0)
fog-atmos (0.1.0)
fog-aws (0.1.2, 0.1.1)
fog-brightbox (0.7.1, 0.7.0)
fog-core (1.30.0, 1.29.0, 1.25.0)
fog-ecloud (0.1.1, 0.0.2)
fog-google (0.0.5)
fog-json (1.0.1, 1.0.0)
fog-local (0.2.1)
fog-powerdns (0.1.1)
fog-profitbricks (0.0.2, 0.0.1)
fog-radosgw (0.0.4, 0.0.3)
fog-riakcs (0.1.0)
fog-sakuracloud (1.0.1, 1.0.0, 0.1.1)
fog-serverlove (0.1.2, 0.1.1)
fog-softlayer (0.4.5, 0.4.1, 0.3.25)
fog-storm_on_demand (0.1.1, 0.1.0)
fog-terremark (0.1.0, 0.0.4, 0.0.3)
fog-vmfusion (0.1.0, 0.0.1)
fog-voxel (0.1.0, 0.0.2)
fog-xml (0.1.2, 0.1.1)
formatador (0.2.5)
gitdis (0.1.2.1, 0.1.1.7, 0.1.1.6, 0.1.1.5, 0.1.1.4, 0.1.1.3, 0.1.1.2, 0.1.0.4, 0.1.0.3, 0.1.0.2, 0.1.0.1, 0.0.2.1)
hashie (2.1.2)
highline (1.7.2, 1.7.1, 1.6.21)
hitimes (1.2.2)
http-cookie (1.0.2)
httpclient (2.6.0.1, 2.4.0)
i18n (0.7.0, 0.6.11)
inflecto (0.0.2)
io-console (0.4.2)
ipaddress (0.8.0)
json (1.8.2, 1.8.1)
libyajl2 (1.2.0, 1.0.1)
method_source (0.8.2)
mime-types (2.5, 2.4.3, 1.25.1)
mini_portile (0.6.2, 0.6.1)
minitar (0.5.4)
minitest (5.6.1, 5.5.1, 5.4.1, 4.7.5)
mixlib-authentication (1.3.0)
mixlib-cli (1.5.0)
mixlib-config (2.1.0)
mixlib-log (1.6.0)
mixlib-shellout (2.0.1, 1.4.0)
multi_json (1.11.0, 1.10.1)
multipart-post (2.0.0)
net-http-persistent (2.9.4)
net-scp (1.2.1)
net-ssh (2.9.2, 2.9.1)
net-ssh-gateway (1.2.0)
net-ssh-multi (1.2.1, 1.2.0)
netrc (0.10.3, 0.7.9, 0.7.7)
nio4r (1.1.0)
nokogiri (1.6.6.2, 1.6.5)
octokit (3.8.0)
ohai (8.3.0, 8.2.0, 7.4.0)
opennebula (4.10.1)
plist (3.1.0)
providence (0.0.2.5)
pry (0.10.1)
psych (2.0.5)
rack (1.6.1, 1.6.0, 1.5.2)
rake (10.4.2, 10.1.0)
rbvmomi (1.8.2)
rdoc (4.1.0)
redis (3.2.1, 3.1.0)
rest-client (1.8.0, 1.6.7)
rest_client (1.8.3, 1.7.3)
retryable (2.0.1)
ridley (4.1.2)
rspec (3.2.0, 3.1.0)
rspec-core (3.2.3, 3.2.2, 3.1.3)
rspec-expectations (3.2.1, 3.2.0, 3.1.1)
rspec-its (1.2.0)
rspec-mocks (3.2.1, 3.1.0)
rspec-support (3.2.2, 3.1.0)
rspec_junit_formatter (0.2.2, 0.2.0)
ruby-prof (0.15.8)
sawyer (0.6.0)
semverse (1.2.1)
serverspec (2.15.0, 2.14.0)
slop (4.1.0, 3.6.0)
solve (1.2.1)
specinfra (2.31.0, 2.27.0)
systemu (2.6.5, 2.6.4)
terminal-table (1.4.5)
test-unit (2.1.3.0)
thor (0.19.1)
thread_safe (0.3.5, 0.3.4)
timers (4.0.1)
trollop (2.0)
typhoeus (0.7.1)
tzinfo (1.2.2)
unf (0.1.4)
unf_ext (0.0.7.1)
uuidtools (2.1.5)
varia_model (0.4.0)
wmi-lite (1.0.0)

user_shell

$ echo $GEM_PATH
/home/rwh/.gem/ruby/2.1.3:/opt/rubies/ruby-2.1.3/lib/ruby/gems/2.1.0

$ echo $GEM_HOME
/home/rwh/.gem/ruby/2.1.3

$ which ruby
/opt/rubies/ruby-2.1.3/bin/ruby

$ which gem
/opt/rubies/ruby-2.1.3/bin/gem

$ gem --version
2.2.2

$ gem list | wc -l
134



$ ruby-prof -m1 --exclude-common-cycles /tmp/test.rb 
Measure Mode: wall_time
Thread ID: 69914849596180
Fiber ID: 69914852990020
Total: 125.055294
Sort by: self_time

 %self      total      self      wait     child     calls  name
 20.90     61.537    26.140     0.000    35.398  8552487   Enumerable#find_all
 14.06     34.066    17.586     0.000    16.480  8788185  *Array#select
 10.95     13.694    13.694     0.000     0.000 60988450   Gem::StubSpecification#name
  8.50     10.631    10.631     0.000     0.000 52009187   Gem::Dependency#type
  5.98      7.480     7.480     0.000     0.000 60883096   String#===
  4.67      5.844     5.844     0.000     0.000 52011672   Symbol#==
  3.33     51.084     4.167     0.000    46.917   505598   Gem::Specification#conflicts
  3.11      8.753     3.889     0.000     4.864  1278425   Gem::Version#<=>
  2.92     39.995     3.652     0.000    36.343  8788166   Gem::Specification#runtime_dependencies
  1.82      2.280     2.280     0.000     0.000  8788166   Gem::Specification#dependencies
  1.50      1.879     1.879     0.000     0.000  1603366   <Class::File>#file?
  1.43      5.215     1.785     0.000     3.430  1885635  *Enumerable#any?