Mercurial > hg-stable
changeset 23288:2b9bc7963504
revlog: increase I/O bound to 4x the amount of data consumed
This doesn't affect normal clones since they'd be bound by the CPU bound below
anyway -- it does, however, improve generaldelta clones significantly.
This also results in better deltaing for generaldelta clones -- in generaldelta
clones, we calculate deltas with respect to the closest base if it has a higher
revision number than either parent. If the base is on a significantly different
branch, this can result in pointlessly massive deltas. This reduces the number
of bases and hence the number of bad deltas.
Empirically, for a highly branchy repository, this resulted in an improvement
of around 15% to manifest size.
| author | Siddharth Agarwal <sid0@fb.com> |
|---|---|
| date | Tue, 11 Nov 2014 20:08:19 -0800 |
| parents | 426d7f901789 |
| children | ae5d0a22ee7e |
| files | mercurial/revlog.py |
| diffstat | 1 files changed, 1 insertions(+), 1 deletions(-) [+] |
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--- a/mercurial/revlog.py Tue Nov 11 20:01:19 2014 -0800 +++ b/mercurial/revlog.py Tue Nov 11 20:08:19 2014 -0800 @@ -1267,7 +1267,7 @@ # the amount of I/O we need to do. # - 'compresseddeltalen' is the sum of the total size of deltas we need # to apply -- bounding it limits the amount of CPU we consume. - if (d is None or dist > textlen * 2 or l > textlen or + if (d is None or dist > textlen * 4 or l > textlen or compresseddeltalen > textlen * 2 or (self._maxchainlen and chainlen > self._maxchainlen)): text = buildtext()