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9055ec5792
This commits introduces two performance improvements in incremental sync:
* avoiding expensive lua string reallocations on each on_lines call by requesting
only the changed chunk of the buffer as reported by firstline and new_lastline
parameters of on_lines
* re-using already allocated tables for storing the resulting lines to reduce the load on
the garbage collector
The majority of the performance improvement is from requesting only changed chunks
of the buffer.
Benchmark:
The following code measures the time required to perform a buffer edit to
that operates individually on each line, common to plugins such as vim-commentary.
set rtp+=~/.config/nvim/plugged/nvim-lspconfig
set rtp+=~/.config/nvim/plugged/vim-commentary
lua require('lspconfig')['ccls'].setup({})
function! Benchmark(tries) abort
let results_comment = []
let results_undo = []
for i in range(a:tries)
echo printf('run %d', i+1)
let begin = reltime()
normal gggcG
call add(results_comment, reltimefloat(reltime(begin)))
let begin = reltime()
silent! undo
call add(results_undo, reltimefloat(reltime(begin)))
redraw
endfor
let avg_comment = 0.0
let avg_undo = 0.0
for i in range(a:tries)
echomsg printf('run %3d: comment=%fs undo=%fs', i+1, results_comment[i], results_undo[i])
let avg_comment += results_comment[i]
let avg_undo += results_undo[i]
endfor
echomsg printf('average: comment=%fs undo=%fs', avg_comment / a:tries, avg_undo / a:tries)
endfunction
command! -bar Benchmark call Benchmark(10)
All text changes will be recorded within a single undo operation. Both the
comment operation itself and the undo operation will generate an on_lines event
for each changed line. Formatter plugins using setline() have also been found
to exhibit the same problem (neoformat, :RustFmt in rust.vim), as this function
too generates an on_lines event for every line it changes.
Using the neovim codebase as an example (commit 2ecf0a4)
with neovim itself built at 2ecf0a4 with
CMAKE_BUILD_TYPE=Release shows the following performance improvement:
src/nvim/lua/executor.c, 1432 lines:
- baseline, no optimizations: comment=0.540587s undo=0.440249s
- without double-buffering optimization: comment=0.183314s undo=0.060663s
- all optimizations in this commit: comment=0.174850s undo=0.052789s
src/nvim/search.c, 5467 lines:
- baseline, no optimizations: comment=7.420446s undo=7.656624s
- without double-buffering optimization: comment=0.889048s undo=0.486026s
- all optimizations in this commit: comment=0.662899s undo=0.243628s
src/nvim/eval.c, 11355 lines:
- baseline, no optimizations: comment=41.775695s undo=44.583374s
- without double-buffering optimization: comment=3.643933s undo=2.817158s
- all optimizations in this commit: comment=1.510886s undo=0.707928s
Co-authored-by: Dmytro Meleshko <dmytro.meleshko@gmail.com>
Documentation | Chat | Twitter
Neovim is a project that seeks to aggressively refactor Vim in order to:
- Simplify maintenance and encourage contributions
- Split the work between multiple developers
- Enable advanced UIs without modifications to the core
- Maximize extensibility
See the Introduction wiki page and Roadmap for more information.
Features
- Modern GUIs
- API access from any language including C/C++, C#, Clojure, D, Elixir, Go, Haskell, Java, JavaScript/Node.js, Julia, Lisp, Lua, Perl, Python, Racket, Ruby, Rust
- Embedded, scriptable terminal emulator
- Asynchronous job control
- Shared data (shada) among multiple editor instances
- XDG base directories support
- Compatible with most Vim plugins, including Ruby and Python plugins
See :help nvim-features for the full list!
Install from package
Pre-built packages for Windows, macOS, and Linux are found on the Releases page.
Managed packages are in Homebrew, Debian, Ubuntu, Fedora, Arch Linux, Void Linux, Gentoo, and more!
Install from source
See the Building Neovim wiki page for details.
The build is CMake-based, but a Makefile is provided as a convenience. After installing the dependencies, run the following command.
make CMAKE_BUILD_TYPE=RelWithDebInfo
sudo make install
To install to a non-default location:
make CMAKE_INSTALL_PREFIX=/full/path/
make install
CMake hints for inspecting the build:
cmake --build build --target helplists all build targets.build/CMakeCache.txt(orcmake -LAH build/) contains the resolved values of all CMake variables.build/compile_commands.jsonshows the full compiler invocations for each translation unit.
Transitioning from Vim
See :help nvim-from-vim for instructions.
Project layout
├─ ci/ build automation
├─ cmake/ build scripts
├─ runtime/ user plugins/docs
├─ src/nvim/ application source code (see src/nvim/README.md)
│ ├─ api/ API subsystem
│ ├─ eval/ VimL subsystem
│ ├─ event/ event-loop subsystem
│ ├─ generators/ code generation (pre-compilation)
│ ├─ lib/ generic data structures
│ ├─ lua/ Lua subsystem
│ ├─ msgpack_rpc/ RPC subsystem
│ ├─ os/ low-level platform code
│ └─ tui/ built-in UI
├─ third-party/ CMake subproject to build dependencies
└─ test/ tests (see test/README.md)
License
Neovim contributions since b17d96 are licensed under the
Apache 2.0 license, except for contributions copied from Vim (identified by the
vim-patch token). See LICENSE for details.
Vim is Charityware. You can use and copy it as much as you like, but you are
encouraged to make a donation for needy children in Uganda. Please see the
kcc section of the vim docs or visit the ICCF web site, available at these URLs:
http://iccf-holland.org/
http://www.vim.org/iccf/
http://www.iccf.nl/
You can also sponsor the development of Vim. Vim sponsors can vote for
features. The money goes to Uganda anyway.