scalability-benchmark/client-hostnames

+sprite11.doc.ic.ac.uk
+sprite12.doc.ic.ac.uk

scalability-benchmark/client/package-lock.json

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+}

scalability-benchmark/client/package.json

+{
+  "type": "module",
+  "engines": {
+    "node": ">=12.0.0"
+  },
+  "dependencies": {
+    "puppeteer": "^2.0.0"
+  }
+}

scalability-benchmark/client/spawn-peer.js

+import puppeteer from "puppeteer"
+
+const appUrl = process.env.APP_URL
+const peerIndex = parseInt(process.env.PEER_INDEX)
+const numPeers = parseInt(process.env.NUM_PEERS)
+
+const syncTimeout = numPeers * 4000
+
+;(async () => {
+  const browser = await puppeteer.launch()
+  try {
+    // Open the application.
+    const page = await browser.newPage()
+    await page.goto(appUrl)
+    console.log(`Peer ${peerIndex}: Connected.`)
+
+    // Set up observer.
+    // Observe the time taken to receive draw calls from all peers, or how many
+    // were synced if it takes longer than `syncTimeout`.
+    await page.evaluate(
+      (numPeers, syncTimeout) => {
+        const canvas = document.querySelector("#canvas")
+        let onResult
+        window.result = new Promise((r) => (onResult = r))
+        const startTime = Date.now()
+        new MutationObserver(() => {
+          if (canvas.childElementCount == numPeers) {
+            onResult([Date.now() - startTime, numPeers])
+          }
+        }).observe(canvas, { childList: true })
+        setTimeout(() => {
+          onResult([syncTimeout, canvas.childElementCount])
+        }, syncTimeout)
+      },
+      numPeers,
+      syncTimeout,
+    )
+
+    // Simulate a mouse click on the canvas.
+    const [left, top] = await page.evaluate(() => {
+      const rect = document.querySelector("#canvas").getBoundingClientRect()
+      return [rect.left, rect.top]
+    })
+    await page.mouse.click(left + 10 + 10 * peerIndex, top + 10)
+    console.log(`Peer ${peerIndex}: Drawn.`)
+
+    // Wait for the observed result.
+    const [elapsed, numSynced] = await page.evaluate(async () => {
+      return await window.result
+    })
+
+    // Report the result.
+    console.log(
+      numSynced == numPeers
+        ? `Peer ${peerIndex}: Sync completed in ${elapsed}ms.`
+        : `Peer ${peerIndex}: Sync failed, ${numSynced} out of ${numPeers} strokes were rendered before the ${syncTimeout}ms timeout.`,
+    )
+  } finally {
+    await browser.close()
+    console.log(`Peer ${peerIndex}: Closed.`)
+  }
+})()

scalability-benchmark/run.sh

+#!/bin/bash
+
+CLIENT_USER=mnr17
+
+cd $(dirname $0)
+
+app_url="https://lets-draw.live?room=test-$(date +%s)"
+client_hostnames=$(cat client-hostnames)
+num_peers=$(echo $client_hostnames | wc -w)
+
+install_pids=""
+for hostname in $client_hostnames; do
+  (
+    ssh -oStrictHostKeyChecking=no $CLIENT_USER@$hostname "rm -rf ~/client" &&
+    scp -r client $CLIENT_USER@$hostname:~/client &&
+    ssh -oStrictHostKeyChecking=no $CLIENT_USER@$hostname "
+      source ~/.nvm/nvm.sh &&
+      cd ~/client &&
+      export PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=1 &&
+      npm install
+    "
+  ) &
+  install_pids="$install_pids $!"
+  # The file system is shared between hosts in this case, so break after
+  # installing once.
+  break
+done
+wait $install_pids
+
+current_peer_index=0
+run_pids=""
+for hostname in $client_hostnames; do
+  ssh -oStrictHostKeyChecking=no $CLIENT_USER@$hostname "
+    source ~/.nvm/nvm.sh &&
+    cd ~/client &&
+    export APP_URL=$app_url &&
+    export PEER_INDEX=$current_peer_index &&
+    export NUM_PEERS=$num_peers &&
+    export PUPPETEER_EXECUTABLE_PATH=\"/opt/google/chrome/chrome\" &&
+    node --experimental-modules spawn-peer.js
+  " &
+  run_pids="$run_pids $!"
+  current_peer_index=$((current_peer_index+1))
+done
+wait $run_pids