Mercurial > hg
comparison mercurial/configitems.toml @ 51108:0250e45040f1
revlog: add a small cache of unfiltered chunk
This can provides a massive boost to the reading of multiple revision and the
computation of a valid delta chain.
This greatly help operation like `hg log --patch`, delta computation (helping
pull/unbundle), linkrev adjustment (helping copy tracing).
A first round of benchmark for `hg log --patch --limit 1000` shows improvement
in the 10-20% range on "small" repository like pypy or mercurial and large
improvements (about 33%) for more complex ones like netbeans and mozilla's.
These speeds up are consistent with the improvement to `hg pull` (from a server
sending poor deltas) I saw benchmarking this last year. Further benchmark will
be run during the freeze.
I added some configuration in the experimental space to be able to further test
the effect of various tuning for now. This feature should fit well in the
"usage/resource profile" configuration that we should land next cycle.
When it does not provides a benefit the overhead of the cache seem to be around
2%, a small price for the big improvement. In addition I believe we could shave
most of this overhead with a more efficent lru implementation.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 27 Oct 2023 08:54:41 +0200 |
parents | 12c308c55e53 |
children | d737bc8a36c9 |
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51107:c2d2e5b65def | 51108:0250e45040f1 |
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1109 name = "sparse-read.min-gap-size" | 1109 name = "sparse-read.min-gap-size" |
1110 default = "65K" | 1110 default = "65K" |
1111 | 1111 |
1112 [[items]] | 1112 [[items]] |
1113 section = "experimental" | 1113 section = "experimental" |
1114 name = "revlog.uncompressed-cache.enabled" | |
1115 default = true | |
1116 experimental = true | |
1117 documentation = """Enable some caching of uncompressed chunk, greatly boosting | |
1118 performance at the cost of memory usage.""" | |
1119 | |
1120 [[items]] | |
1121 section = "experimental" | |
1122 name = "revlog.uncompressed-cache.factor" | |
1123 default = 4 | |
1124 experimental = true | |
1125 documentation = """The size of the cache compared to the largest revision seen.""" | |
1126 | |
1127 [[items]] | |
1128 section = "experimental" | |
1129 name = "revlog.uncompressed-cache.count" | |
1130 default = 10000 | |
1131 experimental = true | |
1132 documentation = """The number of chunk cached.""" | |
1133 | |
1134 [[items]] | |
1135 section = "experimental" | |
1114 name = "stream-v3" | 1136 name = "stream-v3" |
1115 default = false | 1137 default = false |
1116 | 1138 |
1117 [[items]] | 1139 [[items]] |
1118 section = "experimental" | 1140 section = "experimental" |