hotfix: Reduce memory usage when calculating commit graph (!16124) · Merge requests · Administrator / sourcegraph

Administrator requested to merge ef/3.21-memory-opt into 3.21 Nov 24, 2020

Created by: efritz

This PR cherry-picks updates from https://github.com/sourcegraph/sourcegraph/pull/16086 (off of main) into the 3.21 branch so that we can build an image for a customer who is currently experiencing memory pressure.

hotfix: Reduce memory usage when calculating commit graph

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