Commits on Jul 11, 2024

1. Add more profiling traces …

   Someone suggested I look at
   [zed](https://github.com/zed-industries/zed).
   It has some interesting performance characteristics compared to projects
   I looked at before:
   - A lot of workspace members
   - git dependencies
   - patches
   
   This adds traces that help provide more context for those scenarios when
   looking at them.
   
   Some of these areas might be of interest for
   optimizing:
   - On every invocation, we do a git2 `copy_to` call for each git checkout
   - On every invocation, we do a `du` on each git checkout
   - It'd be great to avoid parsing every manifest in a git checkout but we
     need to do a full parse to make sure we find all packages (see
     https://rust-lang.zulipchat.com/#narrow/stream/246057-t-cargo/topic/Redundant.20code.20in.20.60GitSouce.60.3F)
   - Its suspicious how much time we spend in the "poison" step of
     resolving when its a no-op

   

   epage committed Jul 11, 2024
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