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

dirstate-tree: Fold "tracked descendants" counter update in main walk...

dirstate-tree: Fold "tracked descendants" counter update in main walk For the purpose of implementing `has_tracked_dir` (which means "has tracked descendants) without an expensive sub-tree traversal, we maintaing a counter of tracked descendants on each "directory" node of the tree-shaped dirstate. Before this changeset, mutating or inserting a node at a given path would involve: * Walking the tree from root through ancestors to find the node or the spot where to insert it * Looking at the previous node if any to decide what counter update is needed * Performing any node mutation * Walking the tree *again* to update counters in ancestor nodes When profiling `hg status` on a large repo, this second walk takes times while loading a the dirstate from disk. It turns out we have enough information to decide before he first tree walk what counter update is needed. This changeset merges the two walks, gaining ~10% of the total time for `hg update` (in the same hyperfine benchmark as the previous changeset). --- Profiling was done by compiling with this `.cargo/config`: [profile.release] debug = true then running with: py-spy record -r 500 -n -o /tmp/hg.json --format speedscope -- \ ./hg status -R $REPO --config experimental.dirstate-tree.in-memory=1 then visualizing the recorded JSON file in https://www.speedscope.app/ Differential Revision: https://phab.mercurial-scm.org/D10554

Martin von Zweigbergk - - Load All Authors

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             build.rs
        
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                | application/rls-services+xml
            
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             / rust / hgcli / build.rs
          
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      // 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");

          }

      }

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				// 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");
				}
				}