upstream/mercurial-mirror Files · rust/hg-cpython/src/debug.rs

dirstate-tree: Use HashMap instead of BTreeMap...

dirstate-tree: Use HashMap instead of BTreeMap BTreeMap has the advantage of its "natural" iteration order being the one we need in the status algorithm. With HashMap however, iteration order is undefined so we need to allocate a Vec and sort it explicitly. Unfortunately many BTreeMap operations are slower than in HashMap, and skipping that extra allocation and sort is not enough to compensate. Switching to HashMap + sort makes `hg status` 17% faster in one test case, as measure with hyperfine: ``` Benchmark : ../hg2/hg status -R $REPO --config=experimental.dirstate-tree.in-memory=1 Time (mean ± σ): 765.0 ms ± 8.8 ms [User: 1.352 s, System: 0.747 s] Range (min … max): 751.8 ms … 778.7 ms 10 runs Benchmark : ./hg status -R $REPO --config=experimental.dirstate-tree.in-memory=1 Time (mean ± σ): 651.8 ms ± 9.9 ms [User: 1.251 s, System: 0.799 s] Range (min … max): 642.2 ms … 671.8 ms 10 runs Summary './hg status -R $REPO --config=experimental.dirstate-tree.in-memory=1' ran 1.17 ± 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/D10553

Raphaël Gomès - - Load All Authors

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             debug.rs
        
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                | application/rls-services+xml
            
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             / rust / hg-cpython / src / debug.rs
          
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      // debug.rs

      //

      // Copyright 2020 Raphaël Gomès <rgomes@octobus.net>

      //

      // This software may be used and distributed according to the terms of the

      // GNU General Public License version 2 or any later version.

      //! Module to get debug information about Rust extensions.

      use cpython::{PyDict, PyModule, PyResult, Python};

      /// Create the module, with `__package__` given from parent

      pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {

          let dotted_name = &format!("{}.debug", package);

          let m = PyModule::new(py, dotted_name)?;

          m.add(py, "__package__", package)?;

          m.add(py, "__doc__", "Rust debugging information")?;

          let sys = PyModule::import(py, "sys")?;

          let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;

          sys_modules.set_item(py, dotted_name, &m)?;

          Ok(m)

      }

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				// debug.rs
				//
				// Copyright 2020 Raphaël Gomès <rgomes@octobus.net>
				//
				// This software may be used and distributed according to the terms of the
				// GNU General Public License version 2 or any later version.

				//! Module to get debug information about Rust extensions.
				use cpython::{PyDict, PyModule, PyResult, Python};

				/// Create the module, with `__package__` given from parent
				pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
				let dotted_name = &format!("{}.debug", package);
				let m = PyModule::new(py, dotted_name)?;

				m.add(py, "__package__", package)?;
				m.add(py, "__doc__", "Rust debugging information")?;

				let sys = PyModule::import(py, "sys")?;
				let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
				sys_modules.set_item(py, dotted_name, &m)?;

				Ok(m)
				}