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nodemap: introduce an option to use mmap to read the nodemap mapping...
nodemap: introduce an option to use mmap to read the nodemap mapping The performance and memory benefit is much greater if we don't have to copy all the data in memory for each information. So we introduce an option (on by default) to read the data using mmap. This changeset is the last one definition the API for index support nodemap data. (they have to be able to use the mmaping). Below are some benchmark comparing the best we currently have in 5.3 with the final step of this series (using the persistent nodemap implementation in Rust). The benchmark run `hg perfindex` with various revset and the following variants: Before: * do not use the persistent nodemap * use the CPython implementation of the index for nodemap * use mmapping of the changelog index After: * use the MixedIndex Rust code, with the NodeTree object for nodemap access (still in review) * use the persistent nodemap data from disk * access the persistent nodemap data through mmap * use mmapping of the changelog index The persistent nodemap greatly speed up most operation on very large repositories. Some of the previously very fast lookup end up a bit slower because the persistent nodemap has to be setup. However the absolute slowdown is very small and won't matters in the big picture. Here are some numbers (in seconds) for the reference copy of mozilla-try: Revset Before After abs-change speedup -10000: 0.004622 0.005532 0.000910 × 0.83 -10: 0.000050 0.000132 0.000082 × 0.37 tip 0.000052 0.000085 0.000033 × 0.61 0 + (-10000:) 0.028222 0.005337 -0.022885 × 5.29 0 0.023521 0.000084 -0.023437 × 280.01 (-10000:) + 0 0.235539 0.005308 -0.230231 × 44.37 (-10:) + :9 0.232883 0.000180 -0.232703 ×1293.79 (-10000:) + (:99) 0.238735 0.005358 -0.233377 × 44.55 :99 + (-10000:) 0.317942 0.005593 -0.312349 × 56.84 :9 + (-10:) 0.313372 0.000179 -0.313193 ×1750.68 :9 0.316450 0.000143 -0.316307 ×2212.93 On smaller repositories, the cost of nodemap related operation is not as big, so the win is much more modest. Yet it helps shaving a handful of millisecond here and there. Here are some numbers (in seconds) for the reference copy of mercurial: Revset Before After abs-change speedup -10: 0.000065 0.000097 0.000032 × 0.67 tip 0.000063 0.000078 0.000015 × 0.80 0 0.000561 0.000079 -0.000482 × 7.10 -10000: 0.004609 0.003648 -0.000961 × 1.26 0 + (-10000:) 0.005023 0.003715 -0.001307 × 1.35 (-10:) + :9 0.002187 0.000108 -0.002079 ×20.25 (-10000:) + 0 0.006252 0.003716 -0.002536 × 1.68 (-10000:) + (:99) 0.006367 0.003707 -0.002660 × 1.71 :9 + (-10:) 0.003846 0.000110 -0.003736 ×34.96 :9 0.003854 0.000099 -0.003755 ×38.92 :99 + (-10000:) 0.007644 0.003778 -0.003866 × 2.02 Differential Revision: https://phab.mercurial-scm.org/D7894
Raphaël Gomès - - Load All Authors

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Cargo.toml
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Georges Racinet
rust: pure Rust lazyancestors iterator...
 r40307 [package]
name = "hg-core"
version = "0.1.0"
authors = ["Georges Racinet <gracinet@anybox.fr>"]
description = "Mercurial pure Rust core library, with no assumption on Python bindings (FFI)"
Raphaël Gomès
rust: switch hg-core and hg-cpython to rust 2018 edition...
 r42828 edition = "2018"
Raphaël Gomès
rust-re2: add wrapper for calling Re2 from Rust...
 r44786 build = "build.rs"
Georges Racinet
rust: pure Rust lazyancestors iterator...
 r40307
[lib]
name = "hg"
Georges Racinet
rust: translated random test of missingancestors...
 r41841
Raphaël Gomès
rust-dirstate: add rust implementation of `parse_dirstate` and `pack_dirstate`...
 r42488 [dependencies]
Raphaël Gomès
rust-filepatterns: add a Rust implementation of pattern-related utils...
 r42514 byteorder = "1.3.1"
Georges Racinet
rust-node: binary Node ID and conversion utilities...
 r44601 hex = "0.4.0"
Raphaël Gomès
rust-filepatterns: add a Rust implementation of pattern-related utils...
 r42514 lazy_static = "1.3.0"
Raphaël Gomès
rust-re2: add wrapper for calling Re2 from Rust...
 r44786 libc = { version = "0.2.66", optional = true }
Augie Fackler
rust: sort dependencies entries in Cargo.toml...
 r42518 memchr = "2.2.0"
Raphaël Gomès
rust-dependencies: pin the dependencies of hg-core to prevent breakage...
 r43530 rand = "0.6.5"
rand_pcg = "0.1.1"
Raphaël Gomès
rust-dependencies: update rayon...
 r44618 rayon = "1.3.0"
Raphaël Gomès
rust-dependencies: pin the dependencies of hg-core to prevent breakage...
 r43530 regex = "1.1.0"
Raphaël Gomès
rust-performance: introduce FastHashMap type alias for HashMap...
 r44278 twox-hash = "1.5.0"
Raphaël Gomès
rust-utils: add util for canonical path...
 r44783 same-file = "1.0.6"
Raphaël Gomès
rust-pathauditor: add Rust implementation of the `pathauditor`...
 r44737
[dev-dependencies]
Raphaël Gomès
rust-hg-path: add useful methods to `HgPath`...
 r44738 tempfile = "3.1.0"
Raphaël Gomès
rust-re2: add wrapper for calling Re2 from Rust...
 r44786 pretty_assertions = "0.6.1"
[build-dependencies]
cc = { version = "1.0.48", optional = true }
[features]
default = []
with-re2 = ["cc", "libc"]