Separate Bundler download, installation, and metadata concurrency - #9777
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What was the end-user or developer problem that led to this PR?
Bundler sizes compact-index metadata concurrency from processor count and uses
BUNDLE_JOBSfor both CPU-heavy installation and network-heavy gem downloads.What is your fix for the problem, implemented in this PR?
Add
BUNDLE_DOWNLOAD_JOBSandBUNDLE_METADATA_JOBS, and makeBUNDLE_JOBSinstallation-only. Downloads default to 3× installation jobs, capped at 8; metadata defaults to download jobs. Parallel default-gem lookups are serialized so download workers do not race while refreshing the shared compact-index cache.This lets downloads overlap installation without consuming its worker slots, while keeping I/O concurrency bounded on large machines. Across five alternating cold-cache Docker builds per variant, median install time improved by 8.5% (66.0s versus 72.1s) and mean install time improved by 9.2% (67.2s versus 74.0s).
Make sure the following tasks are checked