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authorStan Hu <stanhu@gmail.com>2019-07-01 12:17:37 -0700
committerStan Hu <stanhu@gmail.com>2019-07-01 22:23:01 -0700
commit978647c6cb0f81c3695c4d20e98619c2025532c5 (patch)
tree492b3329f34e97daabc492218e15ed8328adca4a /config
parentdf0be8b226bef4f6680719b5b7618d4b7f8a56b5 (diff)
downloadgitlab-ce-978647c6cb0f81c3695c4d20e98619c2025532c5.tar.gz
Add a memory cache local to the thread to reduce Redis load
Loading `ApplicationSetting` from Redis was responsible for at least 50% of the CPU load of the Redis cluster on GitLab.com. Since these values generally don't change very much, we can load this from the database and cache it in memory, skipping Redis altogther. We use `ActiveSupport::Cache::MemoryStore` as a drop-in replacement for `RedisCacheStore` even though we probably don't need synchronized access within `Thread.current`. Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/63977
Diffstat (limited to 'config')
-rw-r--r--config/initializers/0_thread_cache.rb3
1 files changed, 3 insertions, 0 deletions
diff --git a/config/initializers/0_thread_cache.rb b/config/initializers/0_thread_cache.rb
new file mode 100644
index 00000000000..feb8057132e
--- /dev/null
+++ b/config/initializers/0_thread_cache.rb
@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+Gitlab::ThreadMemoryCache.cache_backend