Get all tips quickly

Hi, 

What is fastest possible way to get all “tips” (leafs of the Git log graph) in a Git repository with hashes of commits they point to?

We at JetBrains are tuning performance of Git log integration in our IntelliJ IDEA and want to get all tips as fast as possible. Currently we use 'git log —branches --tags --remotes --no-walk’, but the problem is that it is slow if there are a lot of references. In our repository we have about 35K tags, and therefore the tags is the main slowdown. On the other hand, we have just a couple of dozens of tips as well as branch references, and `git log --branches --remotes` is very fast.

So we are searching a way to get tags pointing to the graph leafs faster. 

We also tried to read tags by manually parsing .git files (it is faster than invoking git log), but unfortunately annotated tags in .git/refs/tags/ are written without the hashes they point to (unlike .git/packed-refs).

And that’s a pity that `git tag` doesn’t show the hashes.

Thanks a lot for any help!

----- Kirill Likhodedov JetBrains http://www.jetbrains.com "Develop with pleasure!"