Spritesmith memory leak

memory_usage.log

{"rss":54697984,"heapTotal":36393760,"heapUsed":21949752}
{"rss":620531712,"heapTotal":65287968,"heapUsed":29065104}
{"rss":646225920,"heapTotal":64256032,"heapUsed":28251352}
{"rss":647573504,"heapTotal":64256032,"heapUsed":28290648}
{"rss":650907648,"heapTotal":64256032,"heapUsed":28326320}
{"rss":654422016,"heapTotal":64256032,"heapUsed":28348720}
{"rss":657559552,"heapTotal":64256032,"heapUsed":28380736}
{"rss":661073920,"heapTotal":64256032,"heapUsed":28401936}
{"rss":664236032,"heapTotal":64256032,"heapUsed":28430416}
{"rss":667480064,"heapTotal":64256032,"heapUsed":28447160}
{"rss":670859264,"heapTotal":64256032,"heapUsed":28473880}
{"rss":674373632,"heapTotal":64256032,"heapUsed":28489664}
{"rss":677515264,"heapTotal":64256032,"heapUsed":28517184}
{"rss":681029632,"heapTotal":64256032,"heapUsed":28532968}
{"rss":684163072,"heapTotal":64256032,"heapUsed":28559616}
{"rss":687677440,"heapTotal":64256032,"heapUsed":28575848}
{"rss":690810880,"heapTotal":64256032,"heapUsed":28602352}
{"rss":694325248,"heapTotal":64256032,"heapUsed":28618136}
{"rss":697442304,"heapTotal":64256032,"heapUsed":28653776}
{"rss":700956672,"heapTotal":64256032,"heapUsed":28672832}
{"rss":704200704,"heapTotal":64256032,"heapUsed":28688536}
{"rss":707444736,"heapTotal":64256032,"heapUsed":28706136}
{"rss":710959104,"heapTotal":64256032,"heapUsed":28721840}
{"rss":714203136,"heapTotal":64256032,"heapUsed":28737544}
{"rss":717717504,"heapTotal":64256032,"heapUsed":28753248}
{"rss":720850944,"heapTotal":64256032,"heapUsed":28778688}
{"rss":724365312,"heapTotal":64256032,"heapUsed":28799680}
{"rss":727609344,"heapTotal":64256032,"heapUsed":28825664}
{"rss":731123712,"heapTotal":64256032,"heapUsed":28841216}
{"rss":734367744,"heapTotal":64256032,"heapUsed":28856768}
{"rss":737882112,"heapTotal":64256032,"heapUsed":28872320}
{"rss":741126144,"heapTotal":64256032,"heapUsed":28887872}
{"rss":744640512,"heapTotal":64256032,"heapUsed":28906144}
{"rss":747884544,"heapTotal":64256032,"heapUsed":28921696}
{"rss":751398912,"heapTotal":64256032,"heapUsed":28937248}
{"rss":754642944,"heapTotal":64256032,"heapUsed":28952800}
{"rss":757886976,"heapTotal":64256032,"heapUsed":28968352}
{"rss":761401344,"heapTotal":64256032,"heapUsed":28983904}
{"rss":764645376,"heapTotal":64256032,"heapUsed":28999456}
{"rss":768159744,"heapTotal":64256032,"heapUsed":29015008}
{"rss":771403776,"heapTotal":64256032,"heapUsed":29030560}
{"rss":774918144,"heapTotal":64256032,"heapUsed":29046112}
{"rss":778162176,"heapTotal":64256032,"heapUsed":29061664}
{"rss":781406208,"heapTotal":64256032,"heapUsed":29077216}
{"rss":784920576,"heapTotal":64256032,"heapUsed":29093720}
{"rss":788434944,"heapTotal":64256032,"heapUsed":29109272}
{"rss":791678976,"heapTotal":64256032,"heapUsed":29124824}
{"rss":794923008,"heapTotal":64256032,"heapUsed":29140376}
{"rss":798437376,"heapTotal":64256032,"heapUsed":29155928}
{"rss":801681408,"heapTotal":64256032,"heapUsed":29171480}
{"rss":804925440,"heapTotal":64256032,"heapUsed":29187032}
{"rss":808439808,"heapTotal":64256032,"heapUsed":29202584}
{"rss":814039040,"heapTotal":65287968,"heapUsed":28634656}
{"rss":817278976,"heapTotal":65287968,"heapUsed":28656736}
{"rss":820748288,"heapTotal":65287968,"heapUsed":28672456}
{"rss":823992320,"heapTotal":65287968,"heapUsed":28688176}
{"rss":827236352,"heapTotal":65287968,"heapUsed":28703896}
{"rss":830750720,"heapTotal":65287968,"heapUsed":28719616}
{"rss":833994752,"heapTotal":65287968,"heapUsed":28735336}
{"rss":837509120,"heapTotal":65287968,"heapUsed":28751056}
{"rss":840753152,"heapTotal":65287968,"heapUsed":28766776}
{"rss":843997184,"heapTotal":65287968,"heapUsed":28785464}
{"rss":847511552,"heapTotal":65287968,"heapUsed":28805632}
{"rss":850755584,"heapTotal":65287968,"heapUsed":28821352}
{"rss":853999616,"heapTotal":65287968,"heapUsed":28837072}
{"rss":857513984,"heapTotal":65287968,"heapUsed":28852792}
{"rss":860758016,"heapTotal":65287968,"heapUsed":28872776}
{"rss":864272384,"heapTotal":65287968,"heapUsed":28888496}
{"rss":867516416,"heapTotal":65287968,"heapUsed":28904216}
{"rss":870760448,"heapTotal":65287968,"heapUsed":28922496}
{"rss":874156032,"heapTotal":65287968,"heapUsed":28945168}
{"rss":877670400,"heapTotal":65287968,"heapUsed":28960808}
{"rss":880914432,"heapTotal":65287968,"heapUsed":28976448}
{"rss":884158464,"heapTotal":65287968,"heapUsed":28992088}
{"rss":887672832,"heapTotal":65287968,"heapUsed":29007728}
{"rss":890916864,"heapTotal":65287968,"heapUsed":29023368}
{"rss":894160896,"heapTotal":65287968,"heapUsed":29039008}
{"rss":897675264,"heapTotal":65287968,"heapUsed":29062360}
{"rss":900919296,"heapTotal":65287968,"heapUsed":29077912}
{"rss":904433664,"heapTotal":65287968,"heapUsed":29093464}
{"rss":907677696,"heapTotal":65287968,"heapUsed":29109016}
{"rss":911192064,"heapTotal":65287968,"heapUsed":29124568}
{"rss":914436096,"heapTotal":65287968,"heapUsed":29140120}
{"rss":917950464,"heapTotal":65287968,"heapUsed":29155672}
{"rss":921194496,"heapTotal":65287968,"heapUsed":29171224}
{"rss":924708864,"heapTotal":65287968,"heapUsed":29186776}
{"rss":927952896,"heapTotal":65287968,"heapUsed":29202328}
{"rss":931467264,"heapTotal":65287968,"heapUsed":29217880}
{"rss":1087750144,"heapTotal":34329888,"heapUsed":28902344}
{"rss":1090994176,"heapTotal":34329888,"heapUsed":28924368}
{"rss":1094508544,"heapTotal":34329888,"heapUsed":28940048}
{"rss":1097752576,"heapTotal":34329888,"heapUsed":28955728}
{"rss":1100996608,"heapTotal":34329888,"heapUsed":28971408}
{"rss":1104621568,"heapTotal":34329888,"heapUsed":30436208}
{"rss":1107861504,"heapTotal":34329888,"heapUsed":30451888}
{"rss":1111105536,"heapTotal":34329888,"heapUsed":30467568}
{"rss":1114619904,"heapTotal":34329888,"heapUsed":30483248}
{"rss":1117863936,"heapTotal":34329888,"heapUsed":30498928}
{"rss":1121378304,"heapTotal":34329888,"heapUsed":30514608}
{"rss":1124622336,"heapTotal":34329888,"heapUsed":30530288}
{"rss":1128136704,"heapTotal":34329888,"heapUsed":30545968}
{"rss":1131380736,"heapTotal":34329888,"heapUsed":30561648}
{"rss":1134624768,"heapTotal":34329888,"heapUsed":30577328}
{"rss":1138139136,"heapTotal":34329888,"heapUsed":30139696}
{"rss":1143013376,"heapTotal":30214176,"heapUsed":23720136}
{"rss":1143013376,"heapTotal":30214176,"heapUsed":23742160}
{"rss":1143099392,"heapTotal":30214176,"heapUsed":23757840}
{"rss":1143099392,"heapTotal":30214176,"heapUsed":23773520}
{"rss":1144176640,"heapTotal":30214176,"heapUsed":23789200}
{"rss":1147420672,"heapTotal":30214176,"heapUsed":23804880}
{"rss":1150664704,"heapTotal":30214176,"heapUsed":23820560}
{"rss":1154179072,"heapTotal":30214176,"heapUsed":23836240}
{"rss":1157423104,"heapTotal":30214176,"heapUsed":23851920}
{"rss":1160667136,"heapTotal":30214176,"heapUsed":23870208}
{"rss":1164173312,"heapTotal":30214176,"heapUsed":23891360}
{"rss":1167417344,"heapTotal":30214176,"heapUsed":23912256}
{"rss":1170931712,"heapTotal":30214176,"heapUsed":23927872}
{"rss":1174175744,"heapTotal":30214176,"heapUsed":23943488}
{"rss":1177419776,"heapTotal":30214176,"heapUsed":23959104}
{"rss":1180934144,"heapTotal":30214176,"heapUsed":23974720}
{"rss":1184178176,"heapTotal":30214176,"heapUsed":23990336}
{"rss":1187422208,"heapTotal":30214176,"heapUsed":24005952}
{"rss":1190936576,"heapTotal":30214176,"heapUsed":24024448}
{"rss":1194180608,"heapTotal":30214176,"heapUsed":24040064}
{"rss":1197694976,"heapTotal":30214176,"heapUsed":24055680}
{"rss":1200939008,"heapTotal":30214176,"heapUsed":24071296}
{"rss":1204183040,"heapTotal":30214176,"heapUsed":24086912}
{"rss":1207697408,"heapTotal":30214176,"heapUsed":24102528}
{"rss":1210941440,"heapTotal":30214176,"heapUsed":24118144}
{"rss":1214320640,"heapTotal":30214176,"heapUsed":24140120}
{"rss":1217564672,"heapTotal":30214176,"heapUsed":24155736}
{"rss":1221079040,"heapTotal":30214176,"heapUsed":24171352}
{"rss":1224241152,"heapTotal":31246112,"heapUsed":24263000}
{"rss":1227722752,"heapTotal":31246112,"heapUsed":24301600}
{"rss":1231237120,"heapTotal":31246112,"heapUsed":24316952}
{"rss":1234481152,"heapTotal":31246112,"heapUsed":24332304}
{"rss":1237725184,"heapTotal":31246112,"heapUsed":24347656}
{"rss":1241239552,"heapTotal":31246112,"heapUsed":24363008}
{"rss":1244483584,"heapTotal":31246112,"heapUsed":24378360}
{"rss":1247727616,"heapTotal":31246112,"heapUsed":24393712}
{"rss":1251241984,"heapTotal":31246112,"heapUsed":24409064}
{"rss":1254486016,"heapTotal":31246112,"heapUsed":24424416}
{"rss":1258000384,"heapTotal":31246112,"heapUsed":24439768}
{"rss":1261244416,"heapTotal":31246112,"heapUsed":24455120}
{"rss":1264488448,"heapTotal":31246112,"heapUsed":24470472}
{"rss":1268002816,"heapTotal":31246112,"heapUsed":24485824}
{"rss":1271246848,"heapTotal":31246112,"heapUsed":24501176}
{"rss":1274761216,"heapTotal":31246112,"heapUsed":24516528}
{"rss":1278005248,"heapTotal":31246112,"heapUsed":24531880}
{"rss":1281249280,"heapTotal":31246112,"heapUsed":24547232}
{"rss":1284763648,"heapTotal":31246112,"heapUsed":24562584}

spritesmith_memory_leak.js

'use strict';

const fs = require('fs');
const heapdump = require('heapdump');

const File = require('vinyl');
const Spritesmith = require('spritesmith');
const pixelsmith = require('pixelsmith');

const sources = [
    // "./sprite/command.png",
    // "./sprite/icon-location.png",
    // "./sprite/chat.png",
    // "./sprite/german-flag.png",
    // "./sprite/superball.png",
    // "./sprite/bot_inicio.png",
    // "./sprite/camera.png",
    // "./sprite/google.png",
    // "./sprite/font.png",
    // "./sprite/tweet.png",
    "./sprite/NRL-Canberra-Raiders__569847503__1493152203.png",
    "./sprite/apple_ex.png",
    "./sprite/insta-web.png",
    "./sprite/cart.png",
    "./sprite/jpg.jpg"
];

const sourcesContent = sources.map(imagePath =>
    new File({
        path: imagePath,
        history: [],
        content: fs.readFileSync(`${process.cwd()}/${imagePath}`)
    }));

const spritesmith = new Spritesmith({
    engine: pixelsmith
});

const ITERATIONS = 150;

process.nextTick(function printMemoryUsage() {
    console.log(JSON.stringify(process.memoryUsage()));
    heapdump.writeSnapshot(`${process.cwd()}/test-start-${process.pid}-${Date.now()}.heapsnapshot`);
});

for (let i = 0; i < ITERATIONS; i++) {
    spritesmith.createImages(sources, (err, images) => {
        if (err) {
            console.error(err.message);
            console.error(err.stack);
            process.exit(1);
        }

        spritesmith.processImages(images);

        process.nextTick(function printMemoryUsage() {
            console.log(JSON.stringify(process.memoryUsage()));

            if (i % 50 === 0) {
                global.gc();
                heapdump.writeSnapshot(`${process.cwd()}/test-${i}-${process.pid}-${Date.now()}.heapsnapshot`);
            }
        });

    });
}