Merge pull request #4670 from rubygems/25_threads_is_too_much

Use a more limited number of threads when fetching in parallel from the Compact Index API

(cherry picked from commit 54adf80)

Author: deivid-rodriguez

bundler/lib/bundler/fetcher/compact_index.rb

@@ -111,7 +111,7 @@ def serial_compact_index_client
       def bundle_worker(func = nil)
         @bundle_worker ||= begin
           worker_name = "Compact Index (#{display_uri.host})"
-          Bundler::Worker.new(Bundler.current_ruby.rbx? ? 1 : 25, worker_name, func)
+          Bundler::Worker.new(Bundler.settings.processor_count, worker_name, func)
         end
         @bundle_worker.tap do |worker|
           worker.instance_variable_set(:@func, func) if func

bundler/lib/bundler/installer.rb

@@ -222,14 +222,7 @@ def installation_parallelization(options)
       # Parallelization has some issues on Windows, so it's not yet the default
       return 1 if Gem.win_platform?
 
-      processor_count
-    end
-
-    def processor_count
-      require "etc"
-      Etc.nprocessors
-    rescue StandardError
-      1
+      Bundler.settings.processor_count
     end
 
     def load_plugins

bundler/lib/bundler/settings.rb

@@ -210,6 +210,13 @@ def pretty_values_for(exposed_key)
       locations
     end
 
+    def processor_count
+      require "etc"
+      Etc.nprocessors
+    rescue StandardError
+      1
+    end
+
     # for legacy reasons, in Bundler 2, we do not respect :disable_shared_gems
     def path
       configs.each do |_level, settings|