| commit | 1d159f9d895fb5d02936c60eb4a6131d38f707f8 | [log] [tgz] |
|---|---|---|
| author | Alice Kober-Sotzek <aliceks@google.com> | Thu Aug 17 16:10:30 2017 +0200 |
| committer | Alice Kober-Sotzek <aliceks@google.com> | Thu Aug 17 18:33:57 2017 +0200 |
| tree | d75adf2b5bf93d303e18ecff3eb6b44d3cf5b5a7 | |
| parent | d525501b44ba8932e94875c28c123018e2d78ec9 [diff] |
Speed up patch set against patch set diffs The diff computation between patch sets was especially slow when many files (e.g. >20k) were modified by the commits between the parents. The reasons why this was slow are: - The computation of the size and the size delta is expensive for many files. - The computation of the file header and the edits is expensive for many files (whereas DiffFormatter#scan seems to be very cheap). This fix avoids to compute the size and size delta for the diff between the parents. In addition, it sorts out all files which were clearly not touched by the patch sets. The file headers and edits will only be computed for the remaining (much smaller) set of files. As the result should be the same as before, we need not invalidate the cache. The code of this fix is far from being clean in any way. It's a quick hack to fix the immediate performance issue. I promise to clean up the whole implementation in the future. Change-Id: I209cf8150f565946a6cad05f67816e8424737a55
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