# Performing Operations in GitLab

Keep your GitLab instance up and running smoothly.

- [Clean up Redis sessions](cleaning_up_redis_sessions.md): Prior to GitLab 7.3,
  user sessions did not automatically expire from Redis. If
  you have been running a large GitLab server (thousands of users) since before
  GitLab 7.3 we recommend cleaning up stale sessions to compact the Redis
  database after you upgrade to GitLab 7.3.
- [Moving repositories](moving_repositories.md): Moving all repositories managed
  by GitLab to another file system or another server.
- [Sidekiq MemoryKiller](sidekiq_memory_killer.md): Configure Sidekiq MemoryKiller
  to restart Sidekiq.
- [Multiple Sidekiq processes](extra_sidekiq_processes.md): Configure multiple Sidekiq processes to ensure certain queues always have dedicated workers, no matter the number of jobs that need to be processed. **(CORE ONLY)**
- [Puma](puma.md): Understand Puma and puma-worker-killer.
- [Unicorn](unicorn.md): Understand Unicorn and unicorn-worker-killer.
- Speed up SSH operations by [Authorizing SSH users via a fast,
  indexed lookup to the GitLab database](fast_ssh_key_lookup.md), and/or
  by [doing away with user SSH keys stored on GitLab entirely in favor
  of SSH certificates](ssh_certificates.md).
- [Filesystem Performance Benchmarking](filesystem_benchmarking.md): Filesystem
  performance can have a big impact on GitLab performance, especially for actions
  that read or write Git repositories. This information will help benchmark
  filesystem performance against known good and bad real-world systems.
- [ChatOps Scripts](https://gitlab.com/gitlab-com/chatops): The GitLab.com Infrastructure team uses this repository to house
  common ChatOps scripts they use to troubleshoot and maintain the production instance of GitLab.com.
  These scripts are likely useful to administrators of GitLab instances of all sizes.
