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doc: benchmark: describe _why_ Alacritty is so fast in 'unicode-random'

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Daniel Eklöf 2020-06-09 20:55:41 +02:00
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doc/benchmark.md
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@ -40,13 +40,13 @@ Scrollback: 10000 lines
### Results
| Benchmark | Foot (GCC+PGO) 1.3.0.r59 | Alacritty 0.4.3 | URxvt 9.22 | XTerm 356 |
|------------------------|-------------------------:|----------------:|---------------:|---------------:|
| alt-random | 0.450s ±0.009 | 0.905s ±0.003 | 1.151s ±0.004 | 12.906s ±0.078 |
| alt-random-colors | 0.451s ±0.013 | 0.931s ±0.005 | 1.192s ±0.005 | 11.858s ±0.155 |
| scrolling | 1.181s ±0.036 | 1.096s ±0.022 | 1.080s ±0.007 | 38.244s ±0.118 |
| scrolling-filled-lines | 0.878s ±0.015 | 1.320s ±0.040 | 1.251s ±0.006 | 6.812s ±0.031 |
| unicode-random | 0.926s ±1.179 | 0.089s ±0.001 | 24.039s ±3.559 | 26.558s ±3.841 |
| Benchmark | Foot (GCC+PGO) 1.3.0.r59 | Alacritty 0.4.3 | URxvt 9.22 | XTerm 356 |
|------------------------|-------------------------:|---------------------:|---------------:|---------------:|
| alt-random | 0.450s ±0.009 | 0.905s ±0.003 | 1.151s ±0.004 | 12.906s ±0.078 |
| alt-random-colors | 0.451s ±0.013 | 0.931s ±0.005 | 1.192s ±0.005 | 11.858s ±0.155 |
| scrolling | 1.181s ±0.036 | 1.096s ±0.022 | 1.080s ±0.007 | 38.244s ±0.118 |
| scrolling-filled-lines | 0.878s ±0.015 | 1.320s ±0.040 | 1.251s ±0.006 | 6.812s ±0.031 |
| unicode-random | 0.926s ±1.179 | 0.089s ±0.001 [^1] | 24.039s ±3.559 | 26.558s ±3.841 |
@ -73,10 +73,25 @@ Scrollback=10000 lines
### Results
| Benchmark | Foot (GCC+PGO) 1.3.0.r59 | Alacritty 0.4.2 | URxvt 9.22 | St 0.8.3 | XTerm 356 |
|------------------------|-------------------------:|----------------:|---------------:|--------------:|---------------:|
| alt-random | 0.791s ±0.080 | 1.558s ±0.038 | 1.746s ±0.065 | 2.628s ±0.085 | 1.706s ±0.064 |
| alt-random-colors | 0.830s ±0.076 | 1.587s ±0.041 | 2.049s ±0.118 | 3.033s ±0.129 | 2.109s ±0.131 |
| scrolling | 1.603s ±0.070 | 1.464s ±0.098 | 1.439s ±0.035 | 3.760s ±0.113 | 1.459s ±0.036 |
| scrolling-filled-lines | 1.888s ±0.021 | 2.334s ±0.078 | 2.145s ±0.074 | 3.372s ±0.078 | 2.144s ±0.091 |
| unicode-random | 1.545s ±0.229 | 0.164s ±0.012 | 11.180s ±0.342 | crashed | 11.389s ±0.269 |
| Benchmark | Foot (GCC+PGO) 1.3.0.r59 | Alacritty 0.4.2 | URxvt 9.22 | St 0.8.3 | XTerm 356 |
|------------------------|-------------------------:|---------------------:|---------------:|--------------:|---------------:|
| alt-random | 0.791s ±0.080 | 1.558s ±0.038 | 1.746s ±0.065 | 2.628s ±0.085 | 1.706s ±0.064 |
| alt-random-colors | 0.830s ±0.076 | 1.587s ±0.041 | 2.049s ±0.118 | 3.033s ±0.129 | 2.109s ±0.131 |
| scrolling | 1.603s ±0.070 | 1.464s ±0.098 | 1.439s ±0.035 | 3.760s ±0.113 | 1.459s ±0.036 |
| scrolling-filled-lines | 1.888s ±0.021 | 2.334s ±0.078 | 2.145s ±0.074 | 3.372s ±0.078 | 2.144s ±0.091 |
| unicode-random | 1.545s ±0.229 | 0.164s ±0.012 [^1] | 11.180s ±0.342 | crashed | 11.389s ±0.269 |
[^1]: Alacritty is actually **really** slow at rendering this (whether
it is fallback fonts in general, emojis, or something else, I
don't know). I believe the reason it finishes the benchmark so
quickly is because it reads from the PTY in a separate thread,
into a larger receive buffer which is then consumed by the main
thread. This allows the client program to write its output much
faster since it is no longer stalling on a blocked PTY. This means
Alacritty only needs to render a couple of frames since it can
reach the final VT state almost immediately. On the other hand,
`cat`:ing the `unicode-random` test file in an endless loop, or
just manually scrolling up after the benchmark is done is
**slow**, which besides being felt (input lag), can be seen by
setting `debug.render_timer = true` in `alacritty.yml`.