Git fetch performance improvements in 2021, Part 2

In 2021, GitLab experienced significant advancements in server-side Git fetch performance, particularly for CI, through the implementation of the pack-objects cache and other efficiency improvements. The pack-objects cache emerged as a solution to address the limitations of the CI pre-clone script, offering an integrated caching layer that deduplicates identical Git fetch requests, thereby reducing CPU usage. This cache, although initially disabled by default due to increased disk write throughput, proved beneficial for optimizing Git fetch responses and was later enhanced by a new RPC transport system for Git HTTP traffic, effectively circumventing bottlenecks related to gRPC-Go's memory allocation. Additionally, improvements in Git itself, such as optimizing reference scanning and increasing buffer sizes, contributed to these performance gains, reflected in GitLab versions from 14.4 onwards. Despite challenges, these efforts resulted in more efficient handling of Git fetch data and an overall boost in GitLab's server-side capabilities.

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