Mercurial > public > mercurial-scm > hg-stable

annotate rust/hg-core/src/revlog/nodemap_docket.rs @ 46155:fce2f20a54ce

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copies-rust: start recording overwrite as they happens If a revision has information overwriting data from another revision, the overwriting revision is a descendant of the overwritten one. So we could warm the Oracle cache with such information to avoid potential future `is_ancestors` call. This provide us with a large speedup in the most expensive cases: Repo Case Source-Rev Dest-Rev # of revisions old time new time Difference Factor time per rev --------------------------------------------------------------------------------------------------------------------------------------------------------------- mozilla-try x00000_revs_x00000_added_x0000_copies 1b661134e2ca 1ae03d022d6d : 228985 revs, 41.113063 s, 36.001255 s, -5.111808 s, ? 0.8757, 157 ?s/rev mozilla-try x00000_revs_x00000_added_x000_copies 9b2a99adc05e 8e29777b48e6 : 382065 revs, 27.891612 s, 14.340641 s, -13.550971 s, ? 0.5142, 37 ?s/rev Full comparison below: Repo Case Source-Rev Dest-Rev # of revisions old time new time Difference Factor time per rev --------------------------------------------------------------------------------------------------------------------------------------------------------------- mercurial x_revs_x_added_0_copies ad6b123de1c7 39cfcef4f463 : 1 revs, 0.000042 s, 0.000042 s, +0.000000 s, ? 1.0000, 42 ?s/rev mercurial x_revs_x_added_x_copies 2b1c78674230 0c1d10351869 : 6 revs, 0.000114 s, 0.000109 s, -0.000005 s, ? 0.9561, 18 ?s/rev mercurial x000_revs_x000_added_x_copies 81f8ff2a9bf2 dd3267698d84 : 1032 revs, 0.004934 s, 0.004953 s, +0.000019 s, ? 1.0039, 4 ?s/rev pypy x_revs_x_added_0_copies aed021ee8ae8 099ed31b181b : 9 revs, 0.000195 s, 0.000237 s, +0.000042 s, ? 1.2154, 26 ?s/rev pypy x_revs_x000_added_0_copies 4aa4e1f8e19a 359343b9ac0e : 1 revs, 0.000050 s, 0.000050 s, +0.000000 s, ? 1.0000, 50 ?s/rev pypy x_revs_x_added_x_copies ac52eb7bbbb0 72e022663155 : 7 revs, 0.000113 s, 0.000113 s, +0.000000 s, ? 1.0000, 16 ?s/rev pypy x_revs_x00_added_x_copies c3b14617fbd7 ace7255d9a26 : 1 revs, 0.6f1f4a s, 0.6f1f4a s, +0.000000 s, ? 1.0000, 322 ?s/rev pypy x_revs_x000_added_x000_copies df6f7a526b60 a83dc6a2d56f : 6 revs, 0.010788 s, 0.010702 s, -0.000086 s, ? 0.9920, 1783 ?s/rev pypy x000_revs_xx00_added_0_copies 89a76aede314 2f22446ff07e : 4785 revs, 0.050880 s, 0.050504 s, -0.000376 s, ? 0.9926, 10 ?s/rev pypy x000_revs_x000_added_x_copies 8a3b5bfd266e 2c68e87c3efe : 6780 revs, 0.081760 s, 0.080159 s, -0.001601 s, ? 0.9804, 11 ?s/rev pypy x000_revs_x000_added_x000_copies 89a76aede314 7b3dda341c84 : 5441 revs, 0.061382 s, 0.060058 s, -0.001324 s, ? 0.9784, 11 ?s/rev pypy x0000_revs_x_added_0_copies d1defd0dc478 c9cb1334cc78 : 43645 revs, 0.585802 s, 0.536950 s, -0.048852 s, ? 0.9166, 12 ?s/rev pypy x0000_revs_xx000_added_0_copies bf2c629d0071 4ffed77c095c : 2 revs, 0.012803 s, 0.012868 s, +0.000065 s, ? 1.0051, 6434 ?s/rev pypy x0000_revs_xx000_added_x000_copies 08ea3258278e d9fa043f30c0 : 11316 revs, 0.113558 s, 0.112806 s, -0.000752 s, ? 0.9934, 9 ?s/rev netbeans x_revs_x_added_0_copies fb0955ffcbcd a01e9239f9e7 : 2 revs, 0.000085 s, 0.000084 s, -0.000001 s, ? 0.9882, 42 ?s/rev netbeans x_revs_x000_added_0_copies 6f360122949f 20eb231cc7d0 : 2 revs, 0.000106 s, 0.000106 s, +0.000000 s, ? 1.0000, 53 ?s/rev netbeans x_revs_x_added_x_copies 1ada3faf6fb6 5a39d12eecf4 : 3 revs, 0.000175 s, 0.000174 s, -0.000001 s, ? 0.9943, 58 ?s/rev netbeans x_revs_x00_added_x_copies 35be93ba1e2c 9eec5e90c05f : 9 revs, 0.000721 s, 0.000726 s, +0.000005 s, ? 1.0069, 80 ?s/rev netbeans x000_revs_xx00_added_0_copies eac3045b4fdd 51d4ae7f1290 : 1421 revs, 0.010127 s, 0.010105 s, -0.000022 s, ? 0.9978, 7 ?s/rev netbeans x000_revs_x000_added_x_copies e2063d266acd 6081d72689dc : 1533 revs, 0.015616 s, 0.015748 s, +0.000132 s, ? 1.0085, 10 ?s/rev netbeans x000_revs_x000_added_x000_copies ff453e9fee32 411350406ec2 : 5750 revs, 0.061341 s, 0.060357 s, -0.000984 s, ? 0.9840, 10 ?s/rev netbeans x0000_revs_xx000_added_x000_copies 588c2d1ced70 1aad62e59ddd : 66949 revs, 0.542214 s, 0.499356 s, -0.042858 s, ? 0.9210, 7 ?s/rev mozilla-central x_revs_x_added_0_copies 3697f962bb7b 7015fcdd43a2 : 2 revs, 0.000089 s, 0.000092 s, +0.000003 s, ? 1.0337, 46 ?s/rev mozilla-central x_revs_x000_added_0_copies dd390860c6c9 40d0c5bed75d : 8 revs, 0.000279 s, 0.000279 s, +0.000000 s, ? 1.0000, 34 ?s/rev mozilla-central x_revs_x_added_x_copies 8d198483ae3b 14207ffc2b2f : 9 revs, 0.000184 s, 0.000186 s, +0.000002 s, ? 1.0109, 20 ?s/rev mozilla-central x_revs_x00_added_x_copies 98cbc58cc6bc 446a150332c3 : 7 revs, 0.000661 s, 0.000660 s, -0.000001 s, ? 0.9985, 94 ?s/rev mozilla-central x_revs_x000_added_x000_copies 3c684b4b8f68 0a5e72d1b479 : 3 revs, 0.003377 s, 0.003372 s, -0.000005 s, ? 0.9985, 1124 ?s/rev mozilla-central x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 6 revs, 0.070508 s, 0.070294 s, -0.000214 s, ? 0.9970, 11715 ?s/rev mozilla-central x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 1593 revs, 0.006576 s, 0.006545 s, -0.000031 s, ? 0.9953, 4 ?s/rev mozilla-central x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 41 revs, 0.004809 s, 0.004998 s, +0.000189 s, ? 1.0393, 121 ?s/rev mozilla-central x000_revs_x000_added_x000_copies 7c97034feb78 4407bd0c6330 : 7839 revs, 0.064872 s, 0.063348 s, -0.001524 s, ? 0.9765, 8 ?s/rev mozilla-central x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 615 revs, 0.026142 s, 0.026154 s, +0.000012 s, ? 1.0005, 42 ?s/rev mozilla-central x0000_revs_xx000_added_x000_copies f78c615a656c 96a38b690156 : 30263 revs, 0.203956 s, 0.199063 s, -0.004893 s, ? 0.9760, 6 ?s/rev mozilla-central x00000_revs_x0000_added_x0000_copies 6832ae71433c 4c222a1d9a00 : 153721 revs, 1.763853 s, 1.277320 s, -0.486533 s, ? 0.7242, 8 ?s/rev mozilla-central x00000_revs_x00000_added_x000_copies 76caed42cf7c 1daa622bbe42 : 204976 revs, 2.609761 s, 1.698794 s, -0.910967 s, ? 0.6509, 8 ?s/rev mozilla-try x_revs_x_added_0_copies aaf6dde0deb8 9790f499805a : 2 revs, 0.000847 s, 0.000842 s, -0.000005 s, ? 0.9941, 421 ?s/rev mozilla-try x_revs_x000_added_0_copies d8d0222927b4 5bb8ce8c7450 : 2 revs, 0.000867 s, 0.000865 s, -0.000002 s, ? 0.9977, 432 ?s/rev mozilla-try x_revs_x_added_x_copies 092fcca11bdb 936255a0384a : 4 revs, 0.000161 s, 0.000160 s, -0.000001 s, ? 0.9938, 40 ?s/rev mozilla-try x_revs_x00_added_x_copies b53d2fadbdb5 017afae788ec : 2 revs, 0.001131 s, 0.001122 s, -0.000009 s, ? 0.9920, 561 ?s/rev mozilla-try x_revs_x000_added_x000_copies 20408ad61ce5 6f0ee96e21ad : 1 revs, 0.033114 s, 0.032743 s, -0.000371 s, ? 0.9888, 32743 ?s/rev mozilla-try x_revs_x0000_added_x0000_copies effb563bb7e5 c07a39dc4e80 : 6 revs, 0.071092 s, 0.071529 s, +0.000437 s, ? 1.0061, 11921 ?s/rev mozilla-try x000_revs_xx00_added_0_copies 6100d773079a 04a55431795e : 1593 revs, 0.006554 s, 0.006593 s, +0.000039 s, ? 1.0060, 4 ?s/rev mozilla-try x000_revs_x000_added_x_copies 9f17a6fc04f9 2d37b966abed : 41 revs, 0.005160 s, 0.005311 s, +0.000151 s, ? 1.0293, 129 ?s/rev mozilla-try x000_revs_x000_added_x000_copies 1346fd0130e4 4c65cbdabc1f : 6657 revs, 0.065063 s, 0.063063 s, -0.002000 s, ? 0.9693, 9 ?s/rev mozilla-try x0000_revs_x_added_0_copies 63519bfd42ee a36a2a865d92 : 40314 revs, 0.297118 s, 0.312363 s, +0.015245 s, ? 1.0513, 7 ?s/rev mozilla-try x0000_revs_x_added_x_copies 9fe69ff0762d bcabf2a78927 : 38690 revs, 0.284002 s, 0.283106 s, -0.000896 s, ? 0.9968, 7 ?s/rev mozilla-try x0000_revs_xx000_added_x_copies 156f6e2674f2 4d0f2c178e66 : 8598 revs, 0.086311 s, 0.083817 s, -0.002494 s, ? 0.9711, 9 ?s/rev mozilla-try x0000_revs_xx000_added_0_copies 9eec5917337d 67118cc6dcad : 615 revs, 0.026738 s, 0.026516 s, -0.000222 s, ? 0.9917, 43 ?s/rev mozilla-try x0000_revs_xx000_added_x000_copies 89294cd501d9 7ccb2fc7ccb5 : 97052 revs, 1.514270 s, 1.304865 s, -0.209405 s, ? 0.8617, 13 ?s/rev mozilla-try x0000_revs_x0000_added_x0000_copies e928c65095ed e951f4ad123a : 52031 revs, 0.735875 s, 0.681088 s, -0.054787 s, ? 0.9255, 13 ?s/rev mozilla-try x00000_revs_x_added_0_copies 6a320851d377 1ebb79acd503 : 363753 revs, 4.843329 s, 4.454320 s, -0.389009 s, ? 0.9197, 12 ?s/rev mozilla-try x00000_revs_x00000_added_0_copies dc8a3ca7010e d16fde900c9c : 34414 revs, 0.591752 s, 0.567913 s, -0.023839 s, ? 0.9597, 16 ?s/rev mozilla-try x00000_revs_x_added_x_copies 5173c4b6f97c 95d83ee7242d : 362229 revs, 4.760563 s, 4.547043 s, -0.213520 s, ? 0.9551, 12 ?s/rev mozilla-try x00000_revs_x000_added_x_copies 9126823d0e9c ca82787bb23c : 359344 revs, 4.751942 s, 4.378579 s, -0.373363 s, ? 0.9214, 12 ?s/rev mozilla-try x00000_revs_x0000_added_x0000_copies 8d3fafa80d4b eb884023b810 : 192665 revs, 2.605014 s, 1.703622 s, -0.901392 s, ? 0.6540, 8 ?s/rev mozilla-try x00000_revs_x00000_added_x0000_copies 1b661134e2ca 1ae03d022d6d : 228985 revs, 41.113063 s, 36.001255 s, -5.111808 s, ? 0.8757, 157 ?s/rev mozilla-try x00000_revs_x00000_added_x000_copies 9b2a99adc05e 8e29777b48e6 : 382065 revs, 27.891612 s, 14.340641 s, -13.550971 s, ? 0.5142, 37 ?s/rev Differential Revision: https://phab.mercurial-scm.org/D9497
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Sat, 21 Nov 2020 17:00:32 +0100
parents 9eb07ab3f2d4
children 8a4914397d02
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
46091
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1 use memmap::Mmap;
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2 use std::convert::TryInto;
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3 use std::path::{Path, PathBuf};
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4
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5 use super::revlog::{mmap_open, RevlogError};
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6 use crate::utils::strip_suffix;
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7
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8 const ONDISK_VERSION: u8 = 1;
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9
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10 pub(super) struct NodeMapDocket {
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11 pub data_length: usize,
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12 // TODO: keep here more of the data from `parse()` when we need it
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13 }
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14
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15 impl NodeMapDocket {
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16 /// Return `Ok(None)` when the caller should proceed without a persistent
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17 /// nodemap:
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18 ///
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19 /// * This revlog does not have a `.n` docket file (it is not generated for
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20 /// small revlogs), or
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21 /// * The docket has an unsupported version number (repositories created by
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22 /// later hg, maybe that should be a requirement instead?), or
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23 /// * The docket file points to a missing (likely deleted) data file (this
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24 /// can happen in a rare race condition).
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25 pub fn read_from_file(
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26 index_path: &Path,
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27 ) -> Result<Option<(Self, Mmap)>, RevlogError> {
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28 let docket_path = index_path.with_extension("n");
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29 let docket_bytes = match std::fs::read(&docket_path) {
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30 Err(e) if e.kind() == std::io::ErrorKind::NotFound => {
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31 return Ok(None)
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32 }
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33 Err(e) => return Err(RevlogError::IoError(e)),
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34 Ok(bytes) => bytes,
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35 };
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36
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37 let mut input = if let Some((&ONDISK_VERSION, rest)) =
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38 docket_bytes.split_first()
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39 {
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40 rest
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41 } else {
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42 return Ok(None);
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43 };
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44 let input = &mut input;
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45
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46 let uid_size = read_u8(input)? as usize;
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47 let _tip_rev = read_be_u64(input)?;
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48 // TODO: do we care about overflow for 4 GB+ nodemap files on 32-bit
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49 // systems?
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50 let data_length = read_be_u64(input)? as usize;
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51 let _data_unused = read_be_u64(input)?;
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52 let tip_node_size = read_be_u64(input)? as usize;
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53 let uid = read_bytes(input, uid_size)?;
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54 let _tip_node = read_bytes(input, tip_node_size)?;
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55
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56 let uid =
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57 std::str::from_utf8(uid).map_err(|_| RevlogError::Corrupted)?;
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58 let docket = NodeMapDocket { data_length };
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59
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60 let data_path = rawdata_path(&docket_path, uid);
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61 // TODO: use `std::fs::read` here when the `persistent-nodemap.mmap`
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62 // config is false?
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63 match mmap_open(&data_path) {
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64 Ok(mmap) => {
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65 if mmap.len() >= data_length {
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66 Ok(Some((docket, mmap)))
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67 } else {
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68 Err(RevlogError::Corrupted)
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69 }
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70 }
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71 Err(error) => {
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72 if error.kind() == std::io::ErrorKind::NotFound {
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73 Ok(None)
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74 } else {
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75 Err(RevlogError::IoError(error))
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76 }
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77 }
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78 }
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79 }
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80 }
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81
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82 fn read_bytes<'a>(
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83 input: &mut &'a [u8],
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84 count: usize,
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85 ) -> Result<&'a [u8], RevlogError> {
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86 if let Some(start) = input.get(..count) {
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87 *input = &input[count..];
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88 Ok(start)
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89 } else {
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90 Err(RevlogError::Corrupted)
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91 }
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92 }
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93
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94 fn read_u8<'a>(input: &mut &[u8]) -> Result<u8, RevlogError> {
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95 Ok(read_bytes(input, 1)?[0])
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96 }
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97
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98 fn read_be_u64<'a>(input: &mut &[u8]) -> Result<u64, RevlogError> {
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99 let array = read_bytes(input, std::mem::size_of::<u64>())?
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100 .try_into()
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101 .unwrap();
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102 Ok(u64::from_be_bytes(array))
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103 }
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104
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105 fn rawdata_path(docket_path: &Path, uid: &str) -> PathBuf {
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106 let docket_name = docket_path
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107 .file_name()
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108 .expect("expected a base name")
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109 .to_str()
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110 .expect("expected an ASCII file name in the store");
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111 let prefix = strip_suffix(docket_name, ".n.a")
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112 .or_else(|| strip_suffix(docket_name, ".n"))
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113 .expect("expected docket path in .n or .n.a");
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114 let name = format!("{}-{}.nd", prefix, uid);
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115 docket_path
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116 .parent()
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117 .expect("expected a non-root path")
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118 .join(name)
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119 }