upstream/mercurial-mirror Files · rust/hgcli/build.rs

dirstate-tree: Avoid BTreeMap double-lookup when inserting a dirstate entry...

dirstate-tree: Avoid BTreeMap double-lookup when inserting a dirstate entry The child nodes of a given node in the tree-shaped dirstate are kept in a `BTreeMap` where keys are file names as strings. Finding or inserting a value in the map takes `O(log(n))` string comparisons, which adds up when constructing the tree. The `entry` API allows finding a "spot" in the map that may or may not be occupied and then access that value or insert a new one without doing map lookup again. However the current API is limited in that calling `entry` requires an owned key (and so a memory allocation), even if it ends up not being used in the case where the map already has a value with an equal key. This is still a win, with 4% better end-to-end time for `hg status` measured here with hyperfine: ``` Benchmark : ../hg2/hg status -R $REPO --config=experimental.dirstate-tree.in-memory=1 Time (mean ± σ): 1.337 s ± 0.018 s [User: 892.9 ms, System: 437.5 ms] Range (min … max): 1.316 s … 1.373 s 10 runs Benchmark : ./hg status -R $REPO --config=experimental.dirstate-tree.in-memory=1 Time (mean ± σ): 1.291 s ± 0.008 s [User: 853.4 ms, System: 431.1 ms] Range (min … max): 1.283 s … 1.309 s 10 runs Summary './hg status -R $REPO --config=experimental.dirstate-tree.in-memory=1' ran 1.04 ± 0.02 times faster than '../hg2/hg status -R $REPO --config=experimental.dirstate-tree.in-memory=1' ``` * ./hg is this revision * ../hg2/hg is its parent * $REPO is an old snapshot of mozilla-central Differential Revision: https://phab.mercurial-scm.org/D10550

Martin von Zweigbergk - - Load All Authors

File last commit:

r46195:426294d0 default


                r47886:04bcba53

default

Download file

             build.rs
        
                    18 lines
            
             | 577 B
            
                | application/rls-services+xml
            
             |
                RustLexer
            
             / rust / hgcli / build.rs
          
                    History
                
                 |
                  Annotation
                 | Raw
                 |Copy content
                 |Copy permalink

      // This Source Code Form is subject to the terms of the Mozilla Public

      // License, v. 2.0. If a copy of the MPL was not distributed with this

      // file, You can obtain one at https://mozilla.org/MPL/2.0/.

      /*! Build script to integrate PyOxidizer. */

      fn main() {

          if let Ok(config_rs) =

              std::env::var("DEP_PYTHONXY_DEFAULT_PYTHON_CONFIG_RS")

          {

              println!(

                  "cargo:rustc-env=PYOXIDIZER_DEFAULT_PYTHON_CONFIG_RS={}",

                  config_rs

              );

          } else {

              panic!("unable to find build artifacts generated by pyembed crate");

          }

      }

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

				// This Source Code Form is subject to the terms of the Mozilla Public
				// License, v. 2.0. If a copy of the MPL was not distributed with this
				// file, You can obtain one at https://mozilla.org/MPL/2.0/.

				/! Build script to integrate PyOxidizer. /

				fn main() {
				if let Ok(config_rs) =
				std::env::var("DEP_PYTHONXY_DEFAULT_PYTHON_CONFIG_RS")
				{
				println!(
				"cargo:rustc-env=PYOXIDIZER_DEFAULT_PYTHON_CONFIG_RS={}",
				config_rs
				);
				} else {
				panic!("unable to find build artifacts generated by pyembed crate");
				}
				}