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update: add a Rust fast-path when updating from null (and clean) This case is easy to detect and we have all we need to generate a valid working copy and dirstate entirely in Rust, which speeds things up considerably: On my machine updating a repo of ~300k files goes from 10.00s down to 4.2s, all while consuming 50% less system time, with all caches hot. Something to note is that further improvements will probably happen with the upcoming `InnerRevlog` series that does smarter mmap hanlding, especially for filelogs. Here are benchmark numbers on a machine with only 4 cores (and no SMT enabled) ``` ### data-env-vars.name = heptapod-public-2024-03-25-ds2-pnm # benchmark.name = hg.command.update # bin-env-vars.hg.py-re2-module = default # bin-env-vars.hg.changeset.node = <this change> # benchmark.variants.atomic-update = no # benchmark.variants.scenario = null-to-tip # benchmark.variants.worker = default default: 5.328762 ~~~~~ rust: 1.308654 (-75.44%, -4.02) ### data-env-vars.name = mercurial-devel-2024-03-22-ds2-pnm # benchmark.name = hg.command.update # bin-env-vars.hg.py-re2-module = default # bin-env-vars.hg.changeset.node = <this change> # benchmark.variants.atomic-update = no # benchmark.variants.scenario = null-to-tip # benchmark.variants.worker = default default: 1.693271 ~~~~~ rust: 1.151053 (-32.02%, -0.54) ### data-env-vars.name = mozilla-unified-2024-03-22-ds2-pnm # benchmark.name = hg.command.update # bin-env-vars.hg.py-re2-module = default # bin-env-vars.hg.changeset.node = <this change> # benchmark.variants.atomic-update = no # benchmark.variants.scenario = null-to-tip # benchmark.variants.worker = default default: 38.901613 ~~~~~ rust: 11.637880 (-70.08%, -27.26) ### data-env-vars.name = netbsd-xsrc-public-2024-09-19-ds2-pnm # benchmark.name = hg.command.update # bin-env-vars.hg.py-re2-module = default # bin-env-vars.hg.changeset.node = <this change> # benchmark.variants.atomic-update = no # benchmark.variants.scenario = null-to-tip # benchmark.variants.worker = default default: 4.793727 ~~~~~ rust: 1.505905 (-68.59%, -3.29) ```
author Raphaël Gomès <rgomes@octobus.net>
date Tue, 01 Oct 2024 13:49:11 +0200
parents 92e23ba257d1
children
comparison
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52059:b332ae615714 52060:8b7123c8947b
648 "sha-1 0.10.0", 648 "sha-1 0.10.0",
649 "tempfile", 649 "tempfile",
650 "thread_local", 650 "thread_local",
651 "toml", 651 "toml",
652 "twox-hash", 652 "twox-hash",
653 "uuid",
653 "zstd", 654 "zstd",
654 ] 655 ]
655 656
656 [[package]] 657 [[package]]
657 name = "hg-cpython" 658 name = "hg-cpython"
1528 version = "0.1.10" 1529 version = "0.1.10"
1529 source = "registry+https://github.com/rust-lang/crates.io-index" 1530 source = "registry+https://github.com/rust-lang/crates.io-index"
1530 checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b" 1531 checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
1531 1532
1532 [[package]] 1533 [[package]]
1534 name = "uuid"
1535 version = "1.11.0"
1536 source = "registry+https://github.com/rust-lang/crates.io-index"
1537 checksum = "f8c5f0a0af699448548ad1a2fbf920fb4bee257eae39953ba95cb84891a0446a"
1538 dependencies = [
1539 "getrandom 0.2.8",
1540 ]
1541
1542 [[package]]
1533 name = "vcpkg" 1543 name = "vcpkg"
1534 version = "0.2.15" 1544 version = "0.2.15"
1535 source = "registry+https://github.com/rust-lang/crates.io-index" 1545 source = "registry+https://github.com/rust-lang/crates.io-index"
1536 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426" 1546 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
1537 1547