/*
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 0.5 0.5 1305620 85192 ? Ssl 2025 1076:31 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr sasa 1208 0.3 0.4 1305000 73192 ? Ssl 2025 773:04 node /home/sasa/dex8/dex8-panel/server/index.js sasa 1224 0.7 0.7 11838748 128512 ? Ssl 2025 1706:25 node /home/sasa/dex8/dex8-www/server/index.js sasa 1236 0.5 0.6 11819964 107592 ? Ssl 2025 1223:12 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js sasa 1257 0.3 0.4 1304920 73744 ? Ssl 2025 784:44 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js sasa 1289 0.3 0.4 1301872 71420 ? Ssl 2025 771:38 node /home/sasa/dex8/dex8-kiosk/server/index.js sasa 1363 4.5 3.3 12236132 544372 ? Ssl 2025 9693:19 node /home/sasa/voovuu/voovuu-pub/server/index.js sasa 1886 3.3 2.0 12017264 336952 ? Ssl 2025 7065:14 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index. sasa 1214480 0.4 0.7 22311424 125624 ? Ssl 2025 483:32 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214483 0.3 0.3 1101312 65044 ? Ssl 2025 411:33 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214536 0.3 0.4 1101572 66060 ? Ssl 2025 410:29 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214544 0.3 0.3 1100776 65104 ? Ssl 2025 413:17 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214588 0.3 0.3 1100548 64028 ? Ssl 2025 411:27 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214617 0.3 0.4 1102208 66588 ? Ssl 2025 410:21 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214641 0.3 0.3 1100392 64824 ? Ssl 2025 404:30 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214671 0.3 0.3 1099872 63396 ? Ssl 2025 402:53 node /home/sasa/dex8/dex8-worker/starter.js sasa 1215731 0.7 0.7 11708808 124724 ? Ssl 2025 855:28 node /home/sasa/dex8/dex8-api/starter.js sasa 1216489 0.3 0.4 1102584 66424 ? Ssl 2025 409:56 node /home/sasa/dex8/dex8-worker/starter.js sasa 2174536 0.3 0.3 1099356 64548 ? Ssl Mar21 4:18 node /home/sasa/dex8/dex8-worker/starter.js www-data 2289169 0.0 0.0 2608 532 ? S 01:48 0:00 sh -c ps -aux | grep node www-data 2289171 0.0 0.0 3304 648 ? S 01:48 0:00 grep node sasa 2509059 0.5 0.6 11809764 101996 ? Ssl Feb14 300:10 node /home/sasa/miko/miko-hr/server/index.js sasa 2628167 0.8 0.8 1178200 131156 ? Ssl 2025 1725:34 node /home/sasa/voovuu/voovuu-api/starter.js sasa 3168557 0.6 0.5 11820944 95688 ? Ssl 2025 1232:58 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js sasa 3169051 0.5 0.5 11799176 85520 ? Ssl 2025 1009:49 node /home/sasa/@mikosoft/dodo-examples/server/index.js sasa 3264954 0.6 0.5 1330104 83472 ? Ssl Feb21 261:34 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js