automerge-wasm-performance-test.js

const { performance } = require('perf_hooks')

const contestants = [
  {
    key: 'main',
    getCtx () {
      return {
        Automerge: require('./scratch/automerge-main/src/automerge'),
      }
    },
  },
  {
    key: 'performance',
    getCtx () {
      return {
        Automerge: require('./scratch/automerge-performance/src/automerge'),
      }
    },
  },
  {
    key: 'rust',
    getCtx () {
      delete require.cache[require.resolve('./scratch/automerge-performance/src/automerge')]
      const Automerge = require('./scratch/automerge-performance/src/automerge')
      const wasmBackend = require('./scratch/automerge-rs/automerge-backend-wasm')
      Automerge.setDefaultBackend(wasmBackend)
      return { Automerge }
    },
  },
]

for (const contestant of contestants) {
  const ctx = contestant.getCtx()
  const Automerge = ctx.Automerge
  const start = performance.now()
  const numRuns = 1e3
  for (let i = 0; i < numRuns; i++) {
    const doc1 = Automerge.from({
      stringValue: 'string',
      arrayValue: [0, 1],
      mapValue: { a: 'a', b: 'b' }
    })
    const doc2 = Automerge.change(doc1, (doc) => {
      doc.stringValue = 'string:new'
      doc.arrayValue.splice(1, 1, 2, 3)
      doc.mapValue.dessert = 'ice cream'
      delete doc.mapValue.flavor
      doc.mapValue.topping = 'hot fudge'
    })
  }
  const end = performance.now()
  const report = {
    key: contestant.key,
    time: (end - start) / numRuns,
  }
  console.log(JSON.stringify(report, null, 2))
}