99c34c7ce9
The InstanceData type in the rendering subsystem was previously 17 f32s plus one u8 which occupied a total of 72 bytes per instance. This meant that for every character or background cell drawn, 72 bytes were sent to the GPU. In the case of a 400x100 cell grid, a total of 2.9MB would be sent. This patch reduces InstanceData's size to 36 bytes, a 50% improvement! Using the above example for comparison, a worst case of 1.44MB would be transferred. The motivation for this patch comes from macOS. Once the terminal grid would reach a certain size, performance experienced a sharp and dramatic drop (render times would go from ~3ms to ~16ms). I don't want to speculate too much on the underlying issue, but suffice it to say that this patch alleviates the problem in my testing. While the performance impact was most significant on macOS, with rendering times cut by more than 50% in some cases, this also results in a measurable performance difference on other systems with high density grids. Co-authored-by: Christian Duerr <contact@christianduerr.com> |
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| .copr | ||
| .github | ||
| alacritty | ||
| alacritty_terminal | ||
| ci | ||
| docs | ||
| extra | ||
| scripts | ||
| .agignore | ||
| .gitattributes | ||
| .gitignore | ||
| .travis.yml | ||
| alacritty.yml | ||
| Cargo.lock | ||
| Cargo.toml | ||
| CHANGELOG.md | ||
| CONTRIBUTING.md | ||
| INSTALL.md | ||
| LICENSE-APACHE | ||
| Makefile | ||
| README.md | ||
| rustfmt.toml | ||
Alacritty
Alacritty is the fastest terminal emulator in existence. Using the GPU for rendering enables optimizations that simply aren't possible without it. Alacritty currently supports macOS, Linux, BSD, and Windows.
About
Alacritty is a terminal emulator with a strong focus on simplicity and performance. With such a strong focus on performance, included features are carefully considered and you can always expect Alacritty to be blazingly fast. By making sane choices for defaults, Alacritty requires no additional setup. However, it does allow configuration of many aspects of the terminal.
The software is considered to be at a beta level of readiness -- there are a few missing features and bugs to be fixed, but it is already used by many as a daily driver.
Precompiled binaries are available from the GitHub releases page.
Features
You can find an overview over the features available in Alacritty here.
Further information
- Announcing Alacritty, a GPU-Accelerated Terminal Emulator January 6, 2017
- A short talk about Alacritty at the Rust Meetup January 2017 (starts at 57:00)
- Alacritty Lands Scrollback, Publishes Benchmarks September 17, 2018
- Version 0.3.0 Release Announcement April 07, 2019
- Version 0.5.0 Release Announcement July 31, 2020
Installation
Some operating systems already provide binaries for Alacritty, for everyone else the instructions to build Alacritty from source can be found here.
Alpine Linux
apk add alacritty
Arch Linux
pacman -S alacritty
Fedora
Unofficial builds of stable tags can be found in Fedora Copr: pschyska/alacritty.
dnf copr enable pschyska/alacritty
dnf install alacritty
If you want to help test pre-releases, you can additionally enable pschyska/alacritty-testing.
Gentoo Linux
emerge x11-terms/alacritty
GNU Guix
guix package -i alacritty
Mageia
urpmi alacritty
NixOS
nix-env -iA nixos.alacritty
openSUSE Tumbleweed
zypper in alacritty
Pop!_OS
apt install alacritty
Solus
eopkg install alacritty
Void Linux
xbps-install alacritty
FreeBSD
pkg install alacritty
macOS
brew cask install alacritty
Once the cask is installed, it is recommended to set up the manual page, shell
completions, and terminfo definitions. These are located inside the installed
application's Resources directory: Alacritty.app/Contents/Resources.
Windows
Via Chocolatey
choco install alacritty
Via Scoop
scoop bucket add extras
scoop install alacritty
Other
Prebuilt binaries for macOS, and Windows can be downloaded from the GitHub releases page.
On Windows, Alacritty also requires Microsoft's VC++ redistributable.
For Windows versions older than Windows 10 (October 2018 Update), Alacritty
requires winpty to emulate UNIX's PTY API. The agent is a single binary
(winpty-agent.exe) which must be in the same directory as the Alacritty
executable and is available through the
GitHub releases page.
Configuration
You can find the default configuration file with documentation for all available fields on the GitHub releases page for each release.
Alacritty doesn't create the config file for you, but it looks for one in the following locations:
$XDG_CONFIG_HOME/alacritty/alacritty.yml$XDG_CONFIG_HOME/alacritty.yml$HOME/.config/alacritty/alacritty.yml$HOME/.alacritty.yml
Windows
On Windows, the config file should be located at:
%APPDATA%\alacritty\alacritty.yml
Contributing
A full guideline about contributing to Alacritty can be found in the
CONTRIBUTING.md file.
Issues (known, unknown, feature requests, etc.)
If you run into a problem with Alacritty, please file an issue. If you've got a feature request, feel free to ask about it. Please just keep in mind Alacritty is focused on simplicity and performance, and not all features are in line with that goal.
Before opening a new issue, please check if it has already been reported. There's a chance someone else has already reported it, and you can subscribe to that issue to keep up on the latest developments.
FAQ
Is it really the fastest terminal emulator?
In the terminals we've benchmarked, Alacritty is either faster or way faster than the others. If you've found a case where this isn't true, please report a bug.
Why isn't feature X implemented?
Alacritty has many great features, but not every feature from every other terminal. This could be for a number of reasons, but sometimes it's just not a good fit for Alacritty. This means you won't find things like tabs or splits (which are best left to a window manager or terminal multiplexer) nor niceties like a GUI config editor.
macOS + tmux + vim is slow! I thought this was supposed to be fast!
This appears to be an issue outside of terminal emulators; either macOS has an
IPC performance issue, or either tmux or vim (or both) have a bug. This same
issue can be seen in iTerm2 and Terminal.app. I've found that if tmux is
running on another machine which is connected to Alacritty via SSH, this issue
disappears. Actual throughput and rendering performance are still better in
Alacritty.
IRC
Alacritty discussion can be found in #alacritty on freenode.
Wayland
Wayland is used by default on systems that support it. Using XWayland may circumvent Wayland specific issues and can be enabled through:
env WINIT_UNIX_BACKEND=x11 alacritty
License
Alacritty is released under the Apache License, Version 2.0.