Why error benchmark When using express or kao

[7elven]

express.js
`const express = require('express');
const app = express()
const http = require('mitol');

app.get('/', (req, res) => {
res.send('Hello World!');
});

http.createServer(app).listen(3000, () => {
console.log('Example app listening on port 3000!');
});`

kao.js
`const mitol = require('mitol');
const Koa = require('koa');
const app = new Koa();

// response
app.use(ctx => {
ctx.status = 200;
ctx.body = 'Hello World!';
});

mitol.createServer(app.callback()).listen(3000);`

wrk -t12 -c400 -d3s http://127.0.0.1:3000/

Running 3s test @ http://127.0.0.1:3000/
12 threads and 400 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 0.00us 0.00us 0.00us -nan%
Req/Sec 0.00 0.00 0.00 -nan%
0 requests in 3.10s, 0.00B read
Socket errors: connect 0, read 15897, write 0, timeout 0
Requests/sec: 0.00
Transfer/sec: 0.00B

[Helidium]

That is very strange indeed.

My results are following:
wrk -t12 -c400 -d3s http://127.0.0.1:3000/
Running 3s test @ http://127.0.0.1:3000/
12 threads and 400 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 29.01ms 86.46ms 908.70ms 94.53%
Req/Sec 2.87k 1.31k 6.20k 73.03%
94536 requests in 3.10s, 22.63MB read
Requests/sec: 30498.05
Transfer/sec: 7.30MB

Can you please post some details about your test system. Thank you,

[7elven]

my development in digitalocean
2 cpu, 2GB ram, ubuntu 16, wrk last version, node v.8

i don't know why error when test
but it can run on browser perfectly

[Helidium]

Hmmm, is it possible Digital ocean is blocking so much concurrent connections, if you run regular node server, does it work?

[7elven]

const http = require('mitol');
 
let server = http.createServer((req, res) => {
    res.end('Hello World!');
});
 
server.listen(8080, () => {
    console.log('Example app listening on port 8080!')
});

this code can run test and this result

wrk -t12 -c400 -d3s http://127.0.0.1:3000/
Running 3s test @ http://127.0.0.1:3000/
12 threads and 400 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 13.52ms 23.90ms 347.42ms 97.71%
Req/Sec 2.99k 1.13k 11.23k 77.99%
108290 requests in 3.09s, 15.70MB read
Requests/sec: 35099.90
Transfer/sec: 5.09MB

[Helidium]

this is weird, although here youre using a different port...

[Helidium]

I was running the code you posted without problems...

[Helidium]

Did you manage to resolve the problem?

[7elven]

No i try difference port but still error

[7elven]

I try on linux sub system get same error