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103 lines
3.8 KiB
Markdown
103 lines
3.8 KiB
Markdown
# Benchmarks
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## vtebench
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All benchmarks are done using [vtebench](https://github.com/alacritty/vtebench):
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```sh
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vtebench -h $(tput lines) -w $(tput cols) -b 104857600 alt-screen-random-write > ~/alt-random
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vtebench -c -h $(tput lines) -w $(tput cols) -b 104857600 alt-screen-random-write > ~/alt-random-colors
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vtebench -h $(tput lines) -w $(tput cols) -b 10485760 scrolling > ~/scrolling
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vtebench -h $(tput lines) -w $(tput cols) -b 104857600 scrolling --fill-lines > ~/scrolling-filled-lines
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vtebench -h $(tput lines) -w $(tput cols) -b 10485760 unicode-random-write > ~/unicode-random
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```
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They were "executed" using [benchmark.py](../scripts/benchmark.py),
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which will load each file into memory, and then print it to the
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terminal. This is done **20** times for each test. Then it calculates
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the _mean_ and _standard deviation_ for each test.
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## 2020-07-25
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### System
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CPU: i9-9900
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RAM: 64GB
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Graphics: Radeon RX 5500XT
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### Terminal configuration
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Geometry: 2040x1884
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Font: Fantasque Sans Mono 10.00pt/23px
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Scrollback: 10000 lines
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### Results
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| Benchmark | Foot (GCC+PGO) 1.4.2.r14 | Alacritty 0.4.3 | URxvt 9.22 | XTerm 358 |
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|------------------------|-------------------------:|---------------------:|---------------:|---------------:|
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| alt-random | 0.423s ±0.014 | 0.904s ±0.006 | 1.111s ±0.003 | 12.851s ±0.087 |
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| alt-random-colors | 0.382s ±0.005 | 0.935s ±0.005 | 1.146s ±0.007 | 11.816s ±0.088 |
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| scrolling | 1.380s ±0.048 | 1.011s ±0.012 | 1.021s ±0.016 | 38.483s ±0.122 |
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| scrolling-filled-lines | 0.826s ±0.020 | 1.307s ±0.008 | 1.213s ±0.015 | 6.725s ±0.016 |
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| unicode-random | 0.243s ±0.006 | 0.091s ±0.003 [^1] | 24.507s ±3.264 | 26.127s ±3.891 |
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## 2020-07-25
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### System
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CPU: i5-8250U
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RAM: 8GB
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Graphics: Intel UHD Graphics 620
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### Terminal configuration
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Geometry: 945x1020
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Font: Dina:pixelsize=12
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Scrollback=10000 lines
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### Results
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| Benchmark | Foot (GCC+PGO) 1.5.0.r27 | Alacritty 0.5.0 | URxvt 9.22 | St 0.8.4 | XTerm 360 |
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|------------------------|-------------------------:|--------------------:|-----------------:|--------------:|----------------:|
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| alt-random | 0.741s ±0.067 | 1.472s ±0.126 | 1.717s ±0.141 | 1.910s ±0.030 | 37.832s ±0.193 |
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| alt-random-colors | 0.735s ±0.050 | 1.510s ±0.084 | 1.936s ±0.121 | 2.114s ±0.116 | 33.759s ±0.344 |
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| scrolling | 1.687s ±0.044 | 1.440s ±0.128 | 1.485s ±0.032 | 3.485s ±0.142 | 134.590s ±0.602 |
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| scrolling-filled-lines | 1.331s ±0.041 | 2.072s ±0.073 | 2.031s ±0.087 | 2.658s ±0.084 | 20.508s ±0.063 |
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| unicode-random | 0.303s ±0.010 | 0.155s ±0.006 [^1] | 130.967s ±28.161 | crashed | 170.444s ±7.798 |
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[^1]: [Alacritty and "unicode-random"](#alacritty-and-unicode-random)
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# Alacritty and "unicode-random"
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Alacritty is actually **really** slow at rendering this (whether it is
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fallback fonts in general, emojis, or something else, I don't know).
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I believe the reason it finishes the benchmark so quickly is because
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it reads from the PTY in a separate thread, into a larger receive
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buffer which is then consumed by the main thread. This allows the
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client program to write its output much faster since it is no longer
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stalling on a blocked PTY.
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This means Alacritty only needs to render a couple of frames since it
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can reach the final VT state almost immediately.
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On the other hand, `cat`:ing the `unicode-random` test file in an
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endless loop, or just manually scrolling up after the benchmark is
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done is **slow**, which besides being felt (input lag), can be seen by
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setting `debug.render_timer = true` in `alacritty.yml`.
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