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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> |
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date | Tue, 11 Nov 2014 20:08:19 -0800 |
parents | d45010687268 |
children |
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