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<!DOCTYPE html>
<p><b>IMPORTANT:</b> Close web inspector to get accurate benchmark results.</p>
<p>
<button id="run-button">Run Rust Benchmarks</button>
</p>
<p>
<textarea
id="output"
disabled
style="display: block; width: 100%; height: 400px;"
></textarea>
</p>
<script type="module">
import Replicache from './node_modules/replicache/out/mod.js';
const valSize = 1024;
function randomString(len) {
var arr = new Uint8Array(len);
crypto.getRandomValues(arr);
return new TextDecoder('ascii').decode(arr);
}
function deleteDatabase(name) {
return new Promise((resolve, reject) => {
const req = indexedDB.deleteDatabase(name);
req.onsuccess = resolve;
req.onerror = reject;
});
}
let counter = 0;
async function makeRep() {
const name = `bench${counter++}`;
await deleteDatabase(name);
return new Replicache({
diffServerURL: '',
name,
syncInterval: null,
});
}
async function populate(rep, {numKeys}) {
const set = rep.register('populate', async (tx, args) => {
for (let i = 0; i < numKeys; i++) {
await tx.put(`key${i}`, randomString(valSize));
}
});
await set({});
}
async function benchmarkPopulate(bench, opts) {
const rep = await makeRep();
if (!opts.clean) {
await populate(rep, opts);
}
bench.reset();
bench.setName(
`populate ${valSize}x${opts.numKeys} (${opts.clean ? 'clean' : 'dirty'})`,
);
bench.setSize(opts.numKeys * valSize);
await populate(rep, opts);
}
async function benchmarkScan(bench, opts) {
const rep = await makeRep();
bench.setName(`scan ${valSize}x${opts.numKeys}`);
bench.setSize(opts.numKeys * valSize);
await populate(rep, opts);
bench.reset();
await rep.query(async tx => {
let count = 0;
for await (const value of tx.scan()) {
// use the value to be confident we're not optimizing away.
count += value.length;
}
console.log(count);
});
}
async function benchmark(fn) {
const n = 3;
const times = [];
let sum = 0;
let name = String(fn);
let size = 0;
for (let i = 0; i < n; i++) {
let t0 = Date.now();
await fn({
reset: () => {
t0 = Date.now();
},
setName: n => (name = n),
setSize: s => (size = s),
});
const dur = Date.now() - t0;
times.push(dur);
sum += dur;
}
times.sort();
const median = times[Math.floor(n / 2)];
const out = [name, `Median: ${median}`];
if (size) {
out.push('Throughput: ' + humanSize((size / median) * 1000) + '/s');
}
log(...out);
}
async function main() {
log(`Running benchmarks please wait...`);
await benchmark(bench =>
benchmarkPopulate(bench, {numKeys: 1000, clean: true}),
);
await benchmark(bench =>
benchmarkPopulate(bench, {numKeys: 1000, clean: false}),
);
await benchmark(bench => benchmarkScan(bench, {numKeys: 1000}));
await benchmark(bench => benchmarkScan(bench, {numKeys: 5000}));
log('Done!');
}
function humanSize(bytes) {
if (bytes === 0) {
return '0.00 B';
}
const e = Math.floor(Math.log(bytes) / Math.log(1024));
return (bytes / 1024 ** e).toFixed(2) + ' ' + ' KMGTP'[e] + 'B';
}
function log(...args) {
document.querySelector('#output').value += args.join(' | ') + '\n';
}
document.getElementById('run-button').onclick = main;
</script>