Manage Memory and Garbage Collection in Node.js

I ran this lesson on Ubuntu 14.04, Node version 6.2.2. There was no memory leak activity reported.

output

john@john-aspire-7741:~/Documents/fenestra/development/gids-web/node-egghead/http$ node --trace_gc server-heapdump.js
[30883:0x28a71b0]       11 ms: Scavenge 2.1 (37.0) -> 2.0 (37.0) MB, 0.9 / 0 ms [allocation failure].
[30883:0x28a71b0]       16 ms: Scavenge 2.1 (37.0) -> 2.1 (38.0) MB, 1.0 / 0 ms [allocation failure].
[30883:0x28a71b0]      109 ms: Scavenge 4.0 (41.0) -> 3.7 (41.0) MB, 1.0 / 0 ms [allocation failure].
received request
received request
received request
received request

received request
received request
received request
received request
received request
received request
^C
john@john-aspire-7741:~/Documents/fenestra/development/gids-web/node-egghead/http$ node --version
v6.2.2

server-heapdump.js

const http = require('http')
const heapdump = require('heapdump')

function BigData() {
    var mem = Array(1000000).join("a")
}

const leak = []
const server = http.createServer((request, response) => {
    if (request.url === '/') {
        leak.push(new BigData())
        console.log('received request')
        response.writeHead(200, {"Content-Type" : "text/plain"})
        response.end('Hello world')
    }
})

server.listen(3000)

Yup. I was able to duplicate the results you show. The lesson is still accurate for versions of node 4.x and lower but I'll need to update it for v6. Thanks for pointing this out!

I see you are requiring a module heap but it's not been referenced anywhere in the code. Where is the heap dump file created?

Your log say "allocation on failure" mine says "allocation failure". Are they different?