Is there a way to improve the performance of git log --shortstat

[eamodio]

In GitLens (and in GitKraken Client with the new experimental feature to use the Git binary) we run:

git log --stdin -z --format=%x00%x00%H%x00%aN%x00%aE%x00%at%x00%ct%x00%P%x00%D%x00%B%x00 --date-order --all --

Which is nicely optimized when the commit-graph Git feature is enabled, but when you add --shortstat to that it becomes 10x slower. Is there any feature in Git to optimize that?

For reference we use --shortstat to provide the visualization data for the minimap show above the Commit Graph, and for the Changes column so that you can see the magnitude of the change set.

[dscho]

I am not aware of such a feature. But then, this is not a Windows-specific question. Maybe take it to the Git mailing list (send plain-text messages, HTML messages are dropped silently)?

[ffyuanda]

@eamodio Hi, I ran a bunch of perf tests and Git's trace2 API, and found that because every commit needs to be diff'd to show the stats (whether it's shortstat or any stats), I don't think there is a way to overcome this overhead brought by diffing commits.

The extra cost of shortstat vs without shortstat seems to be exactly caused by diffing and its related overhead. This cost is roughly O(n), where n is the number of commits you request.

Please correct me if I'm wrong.

You can check these functions for more info:
log_tree_diff
diffcore_std