[pull] master from microsoft:master #46
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This change is intended to improve the heuristic for loading commits when a prefetch has not completed, either because the clone was run with `--no-prefetch` or because `gvfs.trustPackIndexes` is set to `false`. Previously the heuristic for loading commits before prefetch has completed is: - When a commit is requested to be downloaded, record the tree it points to. - At most once per 5 minutes - When a tree is requested to be downloaded that was previously recorded and it has been at least 5 minutes since the last time a commit - Then download the commit. This works for the most basic case where a user clones a repo, then checks out a branch other than the default. It also limits over-downloading when history or commands are run that load many commits but need few objects from them. However, it doesn't work well when these are combined (eg a history command is run first, then a checkout), or when multiple commands are run in far-apart sections of the commit graph in less than a 5-minute period. The new heuristic is: - When a commit is requested to be downloaded, record the tree it points to, associated with the commit. - When a tree is downloaded that was previously recorded, record the subtrees that it references that have not been downloaded yet and associate them with the same commit. - When a tree is requested to be downloaded, if the number of trees associated with a commit is greater than N, then download the commit. N is currently set to 200, which is approximately the number of trees that are downloaded in the first 3 seconds of attempting to checkout a branch where many trees would be downloaded without batching. Downloading the entire tree graph for a commit as a pack takes about 1 second, so this should limit the amount of time to download all trees for a commit to about 4 seconds, but also be unlikely to download the commit packs for history/blame operations that only need a few trees per commit.
Update heuristic for pre-prefetch commit loading
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