Making GitLab Faster

GitLab 8.5 introduced several performance enhancements aimed at optimizing various processes, including fetching issues closed by a merge request, improving the retrieval of last update times for events, and setting the autocrlf option only when necessary. To address these issues, GitLab implemented a combination of production monitoring systems like GitLab Performance Monitoring with InfluxDB and Grafana, and development tools such as Sherlock and benchmark-ips, to effectively track and measure application performance. The improvements included refactoring the method for fetching closed issues by merging multiple commit messages into a single string, simplifying the retrieval of event update times by reusing already sorted event lists, and modifying the autocrlf setting process to occur only during necessary operations. These enhancements resulted in significant reductions in processing times, such as decreasing issue closure timings from up to 2.5 seconds to under 15 milliseconds, and reducing Atom feed update times from around 10 seconds to mere milliseconds. Despite these advancements, GitLab acknowledges the ongoing need for performance optimization and continues to work on various areas to ensure efficient application functioning.

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