Summary

Improve Git references resolution performance by optimising the file operations involved in the background.

Changes implemented as part of this ticket

Resolving of refs to commit IDs is now improved for heavy fork based workflows

This operation can now utilize multiple threads. There is a new config property that defines how many threads can be used for this operation:

pullrequest.rescope.ref-resolve.max.threads=20

Setting this property value to 0 will restore the original behavior.

Applying the rescope result to pull requests is more optimized

There was some unnecessary work performed when applying the rescope result to the Git repository on disk. This work has been optimized and rescope results will now be applied faster.

Resolving refs to commit IDs is now faster on NFS

The number of IO operations needed to resolve refs has been greatly reduced. The impact of this change is especially noticeable on NFS or when the directory tree is deeply nested.