Re: [PATCH 7/7] index-pack: make quantum of work smaller

Jonathan Tan [off-list ref] writes:

Currently, when index-pack resolves deltas, it does not split up delta
trees into threads: each delta base root (an object that is not a
REF_DELTA or OFS_DELTA) can go into its own thread, but all deltas on
that root (direct or indirect) are processed in the same thread.

This is a problem when a repository contains a large text file (thus,
delta-able) that is modified many times - delta resolution time during
fetching is dominated by processing the deltas corresponding to that
text file.

We favor wide and shallow delta trees for both reduced storage
footprint and lower runtime overhead, so optimizing the index-pack
for that use case makes a lot of sense.