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annotate rust/hg-core/examples/nodemap/main.rs @ 46152:e166e8a035a7

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copies-rust: use the entry API to overwrite deleted entry This is more efficient, more idiomatic and more compact. The main motivation for this change is to cleanup that area before start to do "overwrite" tracking. Such tracking will ultimately help to avoid costly is_ancestors call when merging changeset. Differential Revision: https://phab.mercurial-scm.org/D9494
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Wed, 02 Dec 2020 10:51:40 +0100
parents 8f7c6656ac79
children 6380efb82191
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 // Copyright 2019-2020 Georges Racinet <georges.racinet@octobus.net>
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2 //
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3 // This software may be used and distributed according to the terms of the
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4 // GNU General Public License version 2 or any later version.
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5
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6 use clap::*;
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7 use hg::revlog::node::*;
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8 use hg::revlog::nodemap::*;
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9 use hg::revlog::*;
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10 use memmap::MmapOptions;
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11 use rand::Rng;
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12 use std::fs::File;
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13 use std::io;
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14 use std::io::Write;
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15 use std::path::{Path, PathBuf};
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16 use std::str::FromStr;
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17 use std::time::Instant;
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18
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19 mod index;
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20 use index::Index;
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21
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22 fn mmap_index(repo_path: &Path) -> Index {
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23 let mut path = PathBuf::from(repo_path);
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24 path.extend([".hg", "store", "00changelog.i"].iter());
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25 Index::load_mmap(path)
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26 }
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27
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28 fn mmap_nodemap(path: &Path) -> NodeTree {
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29 let file = File::open(path).unwrap();
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30 let mmap = unsafe { MmapOptions::new().map(&file).unwrap() };
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31 let len = mmap.len();
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32 NodeTree::load_bytes(Box::new(mmap), len)
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33 }
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34
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35 /// Scan the whole index and create the corresponding nodemap file at `path`
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36 fn create(index: &Index, path: &Path) -> io::Result<()> {
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37 let mut file = File::create(path)?;
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38 let start = Instant::now();
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39 let mut nm = NodeTree::default();
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40 for rev in 0..index.len() {
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41 let rev = rev as Revision;
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42 nm.insert(index, index.node(rev).unwrap(), rev).unwrap();
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43 }
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44 eprintln!("Nodemap constructed in RAM in {:?}", start.elapsed());
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45 file.write(&nm.into_readonly_and_added_bytes().1)?;
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46 eprintln!("Nodemap written to disk");
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47 Ok(())
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48 }
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49
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50 fn query(index: &Index, nm: &NodeTree, prefix: &str) {
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51 let start = Instant::now();
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52 let res = nm.find_hex(index, prefix);
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53 println!("Result found in {:?}: {:?}", start.elapsed(), res);
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54 }
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55
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56 fn bench(index: &Index, nm: &NodeTree, queries: usize) {
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57 let len = index.len() as u32;
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58 let mut rng = rand::thread_rng();
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59 let nodes: Vec<Node> = (0..queries)
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60 .map(|_| {
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61 index
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62 .node((rng.gen::<u32>() % len) as Revision)
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63 .unwrap()
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64 .clone()
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65 })
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66 .collect();
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67 if queries < 10 {
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68 let nodes_hex: Vec<String> =
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69 nodes.iter().map(|n| n.encode_hex()).collect();
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70 println!("Nodes: {:?}", nodes_hex);
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71 }
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72 let mut last: Option<Revision> = None;
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73 let start = Instant::now();
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74 for node in nodes.iter() {
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75 last = nm.find_bin(index, node.into()).unwrap();
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76 }
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77 let elapsed = start.elapsed();
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78 println!(
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79 "Did {} queries in {:?} (mean {:?}), last was {:?} with result {:?}",
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80 queries,
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81 elapsed,
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82 elapsed / (queries as u32),
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83 nodes.last().unwrap().encode_hex(),
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84 last
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85 );
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86 }
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87
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88 fn main() {
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89 let matches = App::new("Nodemap pure Rust example")
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90 .arg(
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91 Arg::with_name("REPOSITORY")
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92 .help("Path to the repository, always necessary for its index")
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93 .required(true),
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94 )
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95 .arg(
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96 Arg::with_name("NODEMAP_FILE")
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97 .help("Path to the nodemap file, independent of REPOSITORY")
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98 .required(true),
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99 )
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100 .subcommand(
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101 SubCommand::with_name("create")
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102 .about("Create NODEMAP_FILE by scanning repository index"),
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103 )
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104 .subcommand(
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105 SubCommand::with_name("query")
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106 .about("Query NODEMAP_FILE for PREFIX")
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107 .arg(Arg::with_name("PREFIX").required(true)),
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108 )
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109 .subcommand(
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110 SubCommand::with_name("bench")
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111 .about(
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112 "Perform #QUERIES random successful queries on NODEMAP_FILE")
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113 .arg(Arg::with_name("QUERIES").required(true)),
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114 )
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115 .get_matches();
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116
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117 let repo = matches.value_of("REPOSITORY").unwrap();
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118 let nm_path = matches.value_of("NODEMAP_FILE").unwrap();
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119
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120 let index = mmap_index(&Path::new(repo));
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121
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122 if let Some(_) = matches.subcommand_matches("create") {
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123 println!("Creating nodemap file {} for repository {}", nm_path, repo);
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124 create(&index, &Path::new(nm_path)).unwrap();
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125 return;
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126 }
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127
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128 let nm = mmap_nodemap(&Path::new(nm_path));
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129 if let Some(matches) = matches.subcommand_matches("query") {
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130 let prefix = matches.value_of("PREFIX").unwrap();
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131 println!(
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132 "Querying {} in nodemap file {} of repository {}",
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133 prefix, nm_path, repo
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134 );
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135 query(&index, &nm, prefix);
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136 }
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137 if let Some(matches) = matches.subcommand_matches("bench") {
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138 let queries =
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139 usize::from_str(matches.value_of("QUERIES").unwrap()).unwrap();
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140 println!(
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141 "Doing {} random queries in nodemap file {} of repository {}",
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142 queries, nm_path, repo
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143 );
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144 bench(&index, &nm, queries);
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145 }
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146 }