[ruby-core:101039] [Ruby master Bug#17335] load gem in ruby 2.6.6 extremely slow

Issue #17335 has been updated by paulHu (paul hu).


@jeremyevans0 (Jeremy Evans), thanks for your response. After some experiments, the issue can be boided down to the order of loading gems. If tk is loaded first, then the gems after them would take a long time to load. This becomes extreme with gem rubyXL. Here is the result:

############## first require tk, then rubyXL
*t0 = Time.now
require 'tk'
puts Time.now - t0   # 1.35 secs
t0 = Time.now
require 'rubyXL'
puts Time.now - t0* # 58.6 secs

############## first require rubyXL, then tk
*t0 = Time.now
require 'rubyXL'
puts Time.now - t0 # 0.28 secs
t0 = Time.now
require 'tk'
puts Time.now - t0 # 2.8 secs*

my app use tk as gui. Before I use ruby 2.3.1 and I do not see this issue. After I upgrade to ruby 2.7.2, the issue shows up. And now I downgrade to ruby 2.6.6, the issue is still there.


----------------------------------------
Bug #17335: load gem in ruby 2.6.6 extremely slow
https://bugs.ruby-lang.org/issues/17335#change-88710

* Author: paulHu (paul hu)
* Status: Feedback
* Priority: Normal
* ruby -v: ruby 2.6.6p146 (2020-03-31 revision 67876) [x64-mingw32]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
my ruby app starts up extremely slow after I upgrade from ruby version 2.3.1 to  2.7.2. My app does load quite some gems (using "require") at startup.  Following code would take 29 secs on my windows 10 PC.

puts Time.now.to_s + ' require starts'
require 'net/ssh'
require 'tk'
require 'tkextlib/tile'
require 'thread'
require 'json'
require 'io/console'
require 'csv'

require 'tkextlib/tcllib/plotchart'
require 'tkextlib/tktable'
require 'socket'
require 'tkextlib/tcllib.rb'

require 'rubyXL'
require 'rubyXL/convenience_methods'

puts Time.now.to_s + ' require ends'



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