Created
April 11, 2012 21:05
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node.js 0.6.x garbage collector fail
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var WebSocket = require('ws') | |
// open 200 connections that close after 5 seconds | |
for (var i = 0; i < 200; i++) { openWs() } | |
function openWs() { | |
var ws = new WebSocket('ws://localhost:8080') | |
ws.on('open', function() { | |
ws.send('hello') | |
setTimeout(function() { ws.close(); }, 5000) | |
}); | |
} |
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connected: 0, not garbage collected: 0 | |
connected: 0, not garbage collected: 0 | |
connected: 80, not garbage collected: 80 <-- "node client.js" is started | |
connected: 200, not garbage collected: 200 | |
connected: 200, not garbage collected: 200 | |
connected: 200, not garbage collected: 200 | |
connected: 200, not garbage collected: 200 | |
connected: 125, not garbage collected: 132 | |
connected: 0, not garbage collected: 7 | |
connected: 0, not garbage collected: 7 | |
connected: 0, not garbage collected: 7 | |
connected: 200, not garbage collected: 207 <-- "node client.js" is started | |
connected: 200, not garbage collected: 207 | |
connected: 200, not garbage collected: 207 | |
connected: 200, not garbage collected: 207 | |
connected: 200, not garbage collected: 207 | |
connected: 0, not garbage collected: 26 | |
connected: 0, not garbage collected: 26 | |
connected: 0, not garbage collected: 26 | |
connected: 0, not garbage collected: 26 | |
connected: 0, not garbage collected: 26 | |
connected: 200, not garbage collected: 226 <-- "node client.js" is started | |
connected: 200, not garbage collected: 226 | |
connected: 200, not garbage collected: 226 | |
connected: 200, not garbage collected: 226 | |
connected: 200, not garbage collected: 226 | |
connected: 0, not garbage collected: 30 | |
connected: 0, not garbage collected: 30 | |
connected: 0, not garbage collected: 30 | |
connected: 0, not garbage collected: 30 | |
connected: 0, not garbage collected: 30 | |
connected: 0, not garbage collected: 30 | |
... | |
(the 30 sockets are never gc'ed, even after some minutes) |
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// npm install weak ws | |
// run with "node --expose_gc server.js" | |
var weak = require('weak') | |
, httpServer = require('http').createServer() | |
, WebSocketServer = require('ws').Server | |
var count = 0 | |
, countGc = 0 | |
, wss = new WebSocketServer({ server: httpServer }) | |
setInterval(function() { | |
if (typeof gc === 'function') gc() | |
console.log('connected: %d, not garbage collected: %d', count, countGc) | |
}, 1000) | |
wss.on('connection', function(ws) { | |
ws.send('hello') | |
// count client objects not garbage collected | |
countGc++ | |
weak(ws, function() { countGc-- }) | |
// count connected clients | |
count++ | |
ws.on('close', function() { count-- }) | |
}) | |
httpServer.listen(8080) |
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version 0.10.4
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 199, not garbage collected: 200
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
-> stop client -> run again
connected: 0, not garbage collected: 3
connected: 0, not garbage collected: 3
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 200, not garbage collected: 200
connected: 0, not garbage collected: 0
connected: 0, not garbage collected: 0
connected: 0, not garbage collected: 0
connected: 0, not garbage collected: 0
connected: 0, not garbage collected: 0