Flame graph not works on linux

• Execute: clinic flame --on-port=’autocannon -c2 localhost:$PORT/seed/v1’ – node index.js
• After 2 minutes i press CTRL + C
• Console export: -
• Export: isolate file.log

where is the html file ?

Node: 8.9 OS: ubuntu 16.04

Index.js

` ‘use strict’

const restify = require('restify')
const { etagger, timestamp, fetchContent } = require('./util')()
const server = restify.createServer()

server.use(etagger().bind(server))

server.get('/seed/v1', function (req, res, next) {
  fetchContent(req.url, (err, content) => {
    if (err) return next(err)
    res.send({data: content, url: req.url, ts: timestamp()})
    next()
  })
})

server.listen(3000)`

util.js ` “use strict”;

require(“events”).defaultMaxListeners = Infinity; const crypto = require(“crypto”);

module.exports = () => { const content = crypto.rng(5000).toString(“hex”); const ONE_MINUTE = 60000; var last = Date.now();

function timestamp() {
  var now = Date.now();
  if (now - last >= ONE_MINUTE) last = now;
  return last;
}

function etagger() {
  var cache = {};
  var afterEventAttached = false;
  function attachAfterEvent(server) {
    if (attachAfterEvent === true) return;
    afterEventAttached = true;
    server.on("after", (req, res) => {
      if (res.statusCode !== 200) return;
      if (!res._body) return;
      const key = crypto
        .createHash("sha512")
        .update(req.url)
        .digest()
        .toString("hex");
      const etag = crypto
        .createHash("sha512")
        .update(JSON.stringify(res._body))
        .digest()
        .toString("hex");
      if (cache[key] !== etag) cache[key] = etag;
    });
  }
  return function(req, res, next) {
    attachAfterEvent(this);
    const key = crypto
      .createHash("sha512")
      .update(req.url)
      .digest()
      .toString("hex");
    if (key in cache) res.set("Etag", cache[key]);
    res.set("Cache-Control", "public, max-age=120");
    next();
  };
}

function fetchContent(url, cb) {
  setImmediate(() => {
    if (url !== "/seed/v1")
      cb(Object.assign(Error("Not Found"), { statusCode: 404 }));
    else cb(null, content);
  });
}

return { timestamp, etagger, fetchContent };

};

`

[Rishabh570]

I used 8.12 but now i have an error:

/bin/sh: 1: ’autocannon: not found Fatal error in process observed by 0x. Incomplete V8 isolate log deleted. To preserve these logs, enable debugging (e.g. DEBUG=0x* 0x my-app.js)

But i can execute autocannon commands

I also got this exact error but this was just because of the quote being messed up during copy-paste.

[BridgeAR]

Runs fine on 10 and throws an error on 8.12.0 for me:

bufferAnalysing data
/home/ruben/.nvm/versions/node/v8.12.0/lib/node_modules/clinic/bin.js:261
        if (err) throw err
                 ^

TypeError: "file" argument must be a non-empty string
    at normalizeSpawnArguments (child_process.js:384:11)
    at spawnSync (child_process.js:520:38)
    at ticksToTree (/home/ruben/.nvm/versions/node/v8.12.0/lib/node_modules/clinic/node_modules/0x/lib/ticks-to-tree.js:30:21)
    at render (/home/ruben/.nvm/versions/node/v8.12.0/lib/node_modules/clinic/node_modules/0x/lib/render.js:19:17)
    at generateFlamegraph (/home/ruben/.nvm/versions/node/v8.12.0/lib/node_modules/clinic/node_modules/0x/index.js:76:22)
    at visualize (/home/ruben/.nvm/versions/node/v8.12.0/lib/node_modules/clinic/node_modules/0x/index.js:119:24)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:189:7)

I’ll have a closer look at 8 and why we run into an issue there.