/* This example shows asynchronous execution, non-blocking code. console.log(contents); blocks process and that's why console.log('Do something else!'); must wait Successfully loads files up to 1000MB. */ //load modules var fs = require('fs'); //asynchronous file reading fs.readFile('./testfiles/largefile1000mb.txt', function(err, content){ console.log(content); }); //here process is not blocked. While file is loading the next console.log(); continue with execution console.log('Do something else!'); /* Conclusion: Due to asynchronous execution, first appear 'Do something else' then is file dumped. */
Do something else! undefined
$ps -aux | grep node (list all node processes) sasa 914 0.5 0.5 1307344 84092 ? Ssl Aug04 312:12 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr sasa 935 0.7 0.8 11786840 132956 ? Ssl Aug04 462:33 node /home/sasa/dex8/dex8-api/starter.js sasa 938 0.4 0.4 1307036 76532 ? Ssl Aug04 263:01 node /home/sasa/regoch/regoch-www/server sasa 945 0.3 0.4 1303752 71420 ? Ssl Aug04 225:54 node /home/sasa/dex8/dex8-panel/server/index.js sasa 947 0.7 0.6 11829284 107856 ? Ssl Aug04 462:05 node /home/sasa/dex8/dex8-www/server/index.js sasa 966 0.5 0.5 11808976 97216 ? Ssl Aug04 347:27 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js sasa 980 0.7 0.5 1330216 83508 ? Ssl Aug04 473:35 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js sasa 997 0.3 0.4 1303104 71880 ? Ssl Aug04 228:09 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js sasa 1021 0.3 0.4 1297920 66112 ? Ssl Aug04 224:59 node /home/sasa/dex8/dex8-kiosk/server/index.js sasa 1065 0.6 0.5 11812960 96892 ? Ssl Aug04 382:15 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js sasa 1074 0.6 0.6 1149316 104476 ? Ssl Aug04 373:40 node /home/sasa/voovuu/voovuu-api/starter.js sasa 1136 0.7 0.9 11859620 156060 ? Ssl Aug04 435:11 node /home/sasa/voovuu/voovuu-pub/server/index.js sasa 1148 0.4 0.4 11794644 77988 ? Ssl Aug04 248:54 node /home/sasa/@mikosoft/dodo-examples/server/index.js sasa 1197 0.3 0.3 1099884 62984 ? Ssl Aug04 232:32 node /home/sasa/dex8/dex8-worker/starter.js sasa 1199 0.3 0.4 22277756 77692 ? Ssl Aug04 235:52 node /home/sasa/dex8/dex8-worker/starter.js sasa 1308 0.3 0.3 1099616 63540 ? Ssl Aug04 231:50 node /home/sasa/dex8/dex8-worker/starter.js sasa 1325 0.3 0.3 1099360 62856 ? Ssl Aug04 231:41 node /home/sasa/dex8/dex8-worker/starter.js sasa 1393 0.7 0.8 22326244 145768 ? Ssl Aug04 478:16 node /home/sasa/dex8/dex8-worker/starter.js sasa 1395 0.3 0.3 1099884 63252 ? Ssl Aug04 232:48 node /home/sasa/dex8/dex8-worker/starter.js sasa 1489 0.3 0.3 1100128 63460 ? Ssl Aug04 232:44 node /home/sasa/dex8/dex8-worker/starter.js sasa 1496 0.3 0.3 1100384 64700 ? Ssl Aug04 231:31 node /home/sasa/dex8/dex8-worker/starter.js sasa 1607 0.3 0.3 1099872 63296 ? Ssl Aug04 232:04 node /home/sasa/dex8/dex8-worker/starter.js sasa 1608 0.3 0.3 1099872 63584 ? Ssl Aug04 230:57 node /home/sasa/dex8/dex8-worker/starter.js sasa 1686 1.1 0.9 11846976 148044 ? Ssl Aug04 684:15 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index. www-data 616029 0.0 0.0 2608 592 ? S 16:56 0:00 sh -c ps -aux | grep node www-data 616031 0.0 0.0 3304 644 ? S 16:56 0:00 grep node sasa 1371685 0.4 0.5 11803816 90080 ? Ssl Aug16 186:00 node /home/sasa/mikosoft-info/solar-wind-energy/server/index.js sasa 1460918 0.4 0.3 1300136 65188 ? Ssl Aug17 183:39 node /home/sasa/sites-nodejs/oxygen-free-copper/server.js