Testing out renderer state + alternatives

[developit]

I'll be opening a few PRs for variants of this to get numbers from the perf bot. This one is an experiment to check the cost/benefit of arguments vs rendererState.

I'd originally intended to simply replace properties with accessor functions (rendererState.context = x becomes setCurrentContext(x)) in 8ea55ce, however Terser's inlining has degraded considerably since we last relied on this technique. In particular, it fails to inline any function that is used twice from within the same caller:

function patch() {
  let ctx = getCurrentContext(); // gets inlined
  if (child) {
    setCurrentContext(childCtx); // can be forced inline via @__INLINE__, but that's not great
    patch(child);
    setCurrentContext(ctx); // will never be inlined. forcing via @__INLINE__ inlines as an IIFE 😶‍🌫️
  }
}

So, I decided to try checking whether context or parentDom (the main two properties on RendererState) were driving performance. When I started looking into this though, I realized that context hasn't been an argument for quite some time - it's a backwards walk up the tree. I'd like to do another experimental PR to check if this is a performance tradeoff or not.

[github-actions[bot]]

📊 Tachometer Benchmark Results

Summary

duration

• 02_replace1k: unsure 🔍 -1% - +3% (-0.96ms - +4.32ms)
  ^{preact-local vs preact-master}
• 03_update10th1k_x16: unsure 🔍 -2% - +2% (-1.09ms - +0.89ms)
  ^{preact-local vs preact-master}
• 07_create10k: unsure 🔍 -1% - +0% (-8.85ms - +4.54ms)
  ^{preact-local vs preact-master}
• filter_list: unsure 🔍 -4% - +3% (-51.69ms - +37.13ms)
  ^{preact-local vs preact-master}
• hydrate1k: unsure 🔍 -6% - +12% (-5.76ms - +12.41ms)
  ^{preact-local vs preact-master}
• many_updates: unsure 🔍 -4% - +5% (-36.69ms - +43.94ms)
  ^{preact-local vs preact-master}
• text_update: unsure 🔍 -4% - +10% (-15.24ms - +37.51ms)
  ^{preact-local vs preact-master}
• todo: faster ✔ 0% - 2% (0.16ms - 1.06ms)
  ^{preact-local vs preact-master}

usedJSHeapSize

• 02_replace1k: unsure 🔍 -0% - +0% (-0.01ms - +0.01ms)
  ^{preact-local vs preact-master}
• 03_update10th1k_x16: unsure 🔍 -0% - +0% (-0.00ms - +0.01ms)
  ^{preact-local vs preact-master}
• 07_create10k: unsure 🔍 -3% - +2% (-0.04ms - +0.03ms)
  ^{preact-local vs preact-master}
• filter_list: unsure 🔍 -1% - +0% (-0.01ms - +0.01ms)
  ^{preact-local vs preact-master}
• hydrate1k: unsure 🔍 -0% - -0% (-0.01ms - -0.00ms)
  ^{preact-local vs preact-master}
• many_updates: unsure 🔍 -0% - +0% (-0.01ms - +0.01ms)
  ^{preact-local vs preact-master}
• text_update: unsure 🔍 -0% - -0% (-0.00ms - -0.00ms)
  ^{preact-local vs preact-master}
• todo: unsure 🔍 -2% - +3% (-0.02ms - +0.04ms)
  ^{preact-local vs preact-master}

Results

02_replace1k

• Browser: chrome-headless 100.0.4896.75
• Sample size: 80
• Built by: Benchmarks #753

• Commit: 79c1628

duration

Version	Avg time	vs preact-master	vs preact-local
preact-master	145.15ms - 148.55ms	-	unsure 🔍 -3% - +1% -4.32ms - +0.96ms
preact-local	146.51ms - 150.55ms	unsure 🔍 -1% - +3% -0.96ms - +4.32ms	-

usedJSHeapSize

Version	Avg time	vs preact-master	vs preact-local
preact-master	4.18ms - 4.19ms	-	unsure 🔍 -0% - +0% -0.01ms - +0.01ms
preact-local	4.18ms - 4.19ms	unsure 🔍 -0% - +0% -0.01ms - +0.01ms	-

run-warmup-0

Version	Avg time	vs preact-master	vs preact-local
preact-master	58.81ms - 60.98ms	-	unsure 🔍 -2% - +3% -1.27ms - +1.64ms
preact-local	58.75ms - 60.68ms	unsure 🔍 -3% - +2% -1.64ms - +1.27ms	-

run-warmup-1

Version	Avg time	vs preact-master	vs preact-local
preact-master	85.14ms - 90.38ms	-	unsure 🔍 -4% - +4% -3.77ms - +3.37ms
preact-local	85.54ms - 90.38ms	unsure 🔍 -4% - +4% -3.37ms - +3.77ms	-

run-warmup-2

Version	Avg time	vs preact-master	vs preact-local
preact-master	70.02ms - 72.63ms	-	unsure 🔍 -3% - +2% -1.95ms - +1.75ms
preact-local	70.12ms - 72.73ms	unsure 🔍 -2% - +3% -1.75ms - +1.95ms	-

run-final

Version	Avg time	vs preact-master	vs preact-local
preact-master	145.18ms - 148.57ms	-	unsure 🔍 -3% - +1% -4.33ms - +0.94ms
preact-local	146.55ms - 150.58ms	unsure 🔍 -1% - +3% -0.94ms - +4.33ms	-

03_update10th1k_x16

• Browser: chrome-headless 100.0.4896.75
• Sample size: 50
• Built by: Benchmarks #753

• Commit: 79c1628

duration

Version	Avg time	vs preact-master	vs preact-local
preact-master	49.36ms - 50.69ms	-	unsure 🔍 -2% - +2% -0.89ms - +1.09ms
preact-local	49.19ms - 50.66ms	unsure 🔍 -2% - +2% -1.09ms - +0.89ms	-

usedJSHeapSize

Version	Avg time	vs preact-master	vs preact-local
preact-master	4.20ms - 4.21ms	-	unsure 🔍 -0% - +0% -0.01ms - +0.00ms
preact-local	4.20ms - 4.21ms	unsure 🔍 -0% - +0% -0.00ms - +0.01ms	-

07_create10k

• Browser: chrome-headless 100.0.4896.75
• Sample size: 50
• Built by: Benchmarks #753

• Commit: 79c1628

duration

Version	Avg time	vs preact-master	vs preact-local
preact-master	1307.26ms - 1318.82ms	-	unsure 🔍 -0% - +1% -4.54ms - +8.85ms
preact-local	1307.52ms - 1314.26ms	unsure 🔍 -1% - +0% -8.85ms - +4.54ms	-

usedJSHeapSize

Version	Avg time	vs preact-master	vs preact-local
preact-master	1.39ms - 1.44ms	-	unsure 🔍 -2% - +3% -0.03ms - +0.04ms
preact-local	1.39ms - 1.43ms	unsure 🔍 -3% - +2% -0.04ms - +0.03ms	-

filter_list

• Browser: chrome-headless 100.0.4896.75
• Sample size: 70
• Built by: Benchmarks #753

• Commit: 79c1628

duration

Version	Avg time	vs preact-master	vs preact-local
preact-master	1373.81ms - 1437.14ms	-	unsure 🔍 -3% - +4% -37.13ms - +51.69ms
preact-local	1367.05ms - 1429.34ms	unsure 🔍 -4% - +3% -51.69ms - +37.13ms	-

usedJSHeapSize

Version	Avg time	vs preact-master	vs preact-local
preact-master	2.04ms - 2.05ms	-	unsure 🔍 -0% - +1% -0.01ms - +0.01ms
preact-local	2.03ms - 2.05ms	unsure 🔍 -1% - +0% -0.01ms - +0.01ms	-

hydrate1k

• Browser: chrome-headless 100.0.4896.75
• Sample size: 80
• Built by: Benchmarks #753

• Commit: 79c1628

duration

Version	Avg time	vs preact-master	vs preact-local
preact-master	98.00ms - 110.15ms	-	unsure 🔍 -11% - +5% -12.41ms - +5.76ms
preact-local	100.64ms - 114.15ms	unsure 🔍 -6% - +12% -5.76ms - +12.41ms	-

usedJSHeapSize

Version	Avg time	vs preact-master	vs preact-local
preact-master	6.90ms - 6.90ms	-	unsure 🔍 +0% - +0% +0.00ms - +0.01ms
preact-local	6.90ms - 6.90ms	unsure 🔍 -0% - -0% -0.01ms - -0.00ms	-

many_updates

• Browser: chrome-headless 100.0.4896.75
• Sample size: 60
• Built by: Benchmarks #753

• Commit: 79c1628

duration

Version	Avg time	vs preact-master	vs preact-local
preact-master	933.96ms - 991.35ms	-	unsure 🔍 -5% - +4% -43.94ms - +36.69ms
preact-local	937.96ms - 994.60ms	unsure 🔍 -4% - +5% -36.69ms - +43.94ms	-

usedJSHeapSize

Version	Avg time	vs preact-master	vs preact-local
preact-master	5.70ms - 5.71ms	-	unsure 🔍 -0% - +0% -0.01ms - +0.01ms
preact-local	5.70ms - 5.71ms	unsure 🔍 -0% - +0% -0.01ms - +0.01ms	-

text_update

• Browser: chrome-headless 100.0.4896.75
• Sample size: 80
• Built by: Benchmarks #753

• Commit: 79c1628

duration

Version	Avg time	vs preact-master	vs preact-local
preact-master	349.63ms - 386.49ms	-	unsure 🔍 -10% - +4% -37.51ms - +15.24ms
preact-local	360.33ms - 398.06ms	unsure 🔍 -4% - +10% -15.24ms - +37.51ms	-

usedJSHeapSize

Version	Avg time	vs preact-master	vs preact-local
preact-master	1.30ms - 1.30ms	-	unsure 🔍 +0% - +0% +0.00ms - +0.00ms
preact-local	1.29ms - 1.30ms	unsure 🔍 -0% - -0% -0.00ms - -0.00ms	-

todo

• Browser: chrome-headless 100.0.4896.75
• Sample size: 50
• Built by: Benchmarks #753

• Commit: 79c1628

duration

Version	Avg time	vs preact-master	vs preact-local
preact-master	44.47ms - 45.12ms	-	slower ❌ 0% - 2% 0.16ms - 1.06ms
preact-local	43.88ms - 44.51ms	faster ✔ 0% - 2% 0.16ms - 1.06ms	-

usedJSHeapSize

Version	Avg time	vs preact-master	vs preact-local
preact-master	1.37ms - 1.42ms	-	unsure 🔍 -3% - +2% -0.04ms - +0.02ms
preact-local	1.38ms - 1.43ms	unsure 🔍 -2% - +3% -0.02ms - +0.04ms	-

_{tachometer-reporter-action v2 for Benchmarks}

[github-actions[bot]]

Size Change: -157 B (0%)

Total Size: 38.1 kB

Filename	Size	Change
dist/preact.js	4.58 kB	-60 B (1%)
dist/preact.min.js	4.64 kB	-53 B (1%)
dist/preact.umd.js	4.67 kB	-44 B (0%)

ℹ️ View Unchanged

Filename	Size	Change
compat/dist/compat.js	3.63 kB	0 B
compat/dist/compat.umd.js	3.71 kB	0 B
debug/dist/debug.js	3.25 kB	0 B
debug/dist/debug.umd.js	3.33 kB	0 B
devtools/dist/devtools.js	232 B	0 B
devtools/dist/devtools.umd.js	316 B	0 B
hooks/dist/hooks.js	1.32 kB	0 B
hooks/dist/hooks.umd.js	1.4 kB	0 B
jsx-runtime/dist/jsxRuntime.js	342 B	0 B
jsx-runtime/dist/jsxRuntime.umd.js	425 B	0 B
server/dist/server.js	2.6 kB	0 B
server/dist/server.umd.js	2.69 kB	0 B
test-utils/dist/testUtils.js	431 B	0 B
test-utils/dist/testUtils.umd.js	516 B	0 B

_{compressed-size-action}

[coveralls]

Coverage decreased (-0.006%) to 99.427% when pulling 79c1628facce5c0fa86cb1210def89127a780f90 on renderer-state-refactor into d4ca6fdb19bc715e49fd144e69f7296b2f4daa40 on main.