performance issue with RUBYGEMS_GEMDEPS when Gemfile has git repos

[leomao10]

Hi There,

I just found that when I use RUBYGEMS_GEMDEPS and there are some gems in Gemfile that is from github. All command related to rubygems will become really slow.

Here is the env I am testing:

• Rubygem version: 2.4.8
• Chruby version: HEAD
• direnv version: 2.7.0

And here is the Gemfile:

ruby "2.2.2"
source "https://rubygems.org"

gem 'rake', git: "https://github.com/ruby/rake.git"
gem 'rack', git: "https://github.com/rack/rack.git"
gem 'vcr', git: "https://github.com/vcr/vcr.git"
gem 'shoulda-matchers', git: "https://github.com/thoughtbot/shoulda-matchers.git"

And here are the command I ran with time:

time bundle #after all gems installed
#=>  bundle  1.02s user 0.46s system 9% cpu 15.658 total

time gem --version
#=> gem --version  0.68s user 0.40s system 7% cpu 14.536 total

time gem list tile
#=> gem list tilt  0.85s user 0.44s system 4% cpu 29.202 total

time gem help
#=> gem help  0.72s user 0.42s system 9% cpu 12.460 total

If I use gems from rubygems.org, then these commands will back to normal:

Here is the Gemfile:

ruby "2.2.2"
source "https://rubygems.org"

gem 'multi_json'
gem 'tilt'
gem 'rack'
gem 'vcr'
gem 'shoulda-matchers'

And here are the command I ran and the time:

time bundle # After all gems installed
#=> bundle  0.41s user 0.05s system 98% cpu 0.461 total

time gem --version
#=> gem --version  0.22s user 0.03s system 98% cpu 0.261 total

time gem list tilt
#=> gem list tilt  0.37s user 0.05s system 99% cpu 0.425 total

time gem help
#=> gem help  0.22s user 0.03s system 98% cpu 0.262 total

Here is a simple repo that I use to create this issue:
https://github.com/leomao10/gemdeps_demo

Let me know if you need me to provide more information

Cheers

[leomao10]

Tried with master branch and it behave the same.

[copiousfreetime]

Running this with ruby 2.3.1 and rubygems 2.6.4 the results are:

                  github gems   rubygems

bundle            0m5.090s      0m0.359s
gem --version     0m4.901s      0m0.172s
gem list tile     0m4.743s      0m0.230s
gem list tilt     0m4.754s      0m0.234s
gem help          0m5.161s      0m0.236s

It definitely looks like there is a performance issue there. My complete guess is that there is some automatic querying of the remote git repos going on during all the commands.

[bronzdoc]

We're going to close this because it is so old, but if this problem is still happening with the latest version of RubyGems please feel free to let us know with a new issue!

[leomao10]

Test again with ruby 2.7.0, don't have the same issue again 👍