/*
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 1194 0.4 0.5 1305996 85048 ? Ssl 2025 1158:24 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr sasa 1208 0.3 0.4 1305000 73416 ? Ssl 2025 833:04 node /home/sasa/dex8/dex8-panel/server/index.js sasa 1224 0.7 0.6 11828992 105584 ? Ssl 2025 1852:46 node /home/sasa/dex8/dex8-www/server/index.js sasa 1236 0.5 0.6 11821072 108040 ? Ssl 2025 1318:09 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js sasa 1257 0.3 0.4 1303640 72360 ? Ssl 2025 845:46 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js sasa 1289 0.3 0.4 1297836 68072 ? Ssl 2025 831:34 node /home/sasa/dex8/dex8-kiosk/server/index.js sasa 1363 4.5 2.9 12179012 489948 ? Ssl 2025 10580:29 node /home/sasa/voovuu/voovuu-pub/server/index.js sasa 1886 3.5 2.3 12055632 384172 ? Ssl 2025 8200:40 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index. sasa 1214480 0.3 0.7 22311168 126608 ? Ssl 2025 551:00 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214483 0.3 0.4 1101312 66176 ? Ssl 2025 475:51 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214536 0.3 0.4 1100804 66464 ? Ssl 2025 474:39 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214544 0.3 0.3 1101032 65452 ? Ssl 2025 477:56 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214588 0.3 0.4 1102340 65840 ? Ssl 2025 475:42 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214617 0.3 0.4 1101440 66248 ? Ssl 2025 474:27 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214641 0.3 0.3 1100648 64476 ? Ssl 2025 467:34 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214671 0.3 0.3 1100384 63512 ? Ssl 2025 465:48 node /home/sasa/dex8/dex8-worker/starter.js sasa 1215731 0.6 0.7 11708856 123356 ? Ssl 2025 961:34 node /home/sasa/dex8/dex8-api/starter.js sasa 1216489 0.3 0.4 1102072 65720 ? Ssl 2025 474:00 node /home/sasa/dex8/dex8-worker/starter.js sasa 2509059 0.5 0.7 11834136 125460 ? Ssl Feb14 413:07 node /home/sasa/miko/miko-hr/server/index.js sasa 2628167 0.8 0.8 1176408 132048 ? Ssl 2025 1871:33 node /home/sasa/voovuu/voovuu-api/starter.js sasa 3168557 0.6 0.5 11812460 95332 ? Ssl 2025 1343:39 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js sasa 3169051 0.5 0.5 11799176 84780 ? Ssl 2025 1106:04 node /home/sasa/@mikosoft/dodo-examples/server/index.js sasa 3264954 0.6 0.5 1331108 84392 ? Ssl Feb21 399:26 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js sasa 3754638 0.3 0.4 1101916 66924 ? Ssl 04:03 1:38 node /home/sasa/dex8/dex8-worker/starter.js www-data 3796590 0.0 0.0 2608 596 ? S 12:41 0:00 sh -c ps -aux | grep node www-data 3796592 0.0 0.0 3304 652 ? S 12:41 0:00 grep node