Use Runtime.max_threads to size Redis caches

lib/gitlab/redis/wrapper.rb

@@ -22,11 +22,8 @@ module Gitlab
         def pool_size
           # heuristic constant 5 should be a config setting somewhere -- related to CPU count?
           size = 5
-          if Gitlab::Runtime.sidekiq?
-            # the pool will be used in a multi-threaded context
-            size += Sidekiq.options[:concurrency]
-          elsif Gitlab::Runtime.puma?
-            size += Puma.cli_config.options[:max_threads]
+          if Gitlab::Runtime.multi_threaded?
+            size += Gitlab::Runtime.max_threads
           end
 
           size

spec/support/redis/redis_shared_examples.rb

@@ -116,9 +116,9 @@ RSpec.shared_examples "redis_shared_examples" do
       clear_pool
     end
 
-    context 'when running not on sidekiq workers' do
+    context 'when running on single-threaded runtime' do
       before do
-        allow(Gitlab::Runtime).to receive(:sidekiq?).and_return(false)
+        allow(Gitlab::Runtime).to receive(:multi_threaded?).and_return(false)
       end
 
       it 'instantiates a connection pool with size 5' do
@@ -128,10 +128,10 @@ RSpec.shared_examples "redis_shared_examples" do
       end
     end
 
-    context 'when running on sidekiq workers' do
+    context 'when running on multi-threaded runtime' do
       before do
-        allow(Gitlab::Runtime).to receive(:sidekiq?).and_return(true)
-        allow(Sidekiq).to receive(:options).and_return({ concurrency: 18 })
+        allow(Gitlab::Runtime).to receive(:multi_threaded?).and_return(true)
+        allow(Gitlab::Runtime).to receive(:max_threads).and_return(18)
       end
 
       it 'instantiates a connection pool with a size based on the concurrency of the worker' do