/*
This example shows synchronous execution, blocking code.
console.log(contents); blocks process and that's why
console.log('Do something else!'); must wait
Max file that didn't crash nodeJS had 350MB
*/
//load modules
var fs = require('fs');
//synchronous file reading
var content = fs.readFile('./testfiles/largefile350mb.txt', 'utf8');
console.log(content); //returns 'undefined' because readFile requires callback and dont return any value
//here process is blocked while file is not read completely. After that next console.log(); continue
console.log('Do something else!');
/*
Conclusion: Due to asynchronous execution, first is file dumped then appear 'Do something else'.
That's because console.log('Do something else!'); waits fs.readFileSync('largefile350mb.txt', 'utf8'); to be finished.
*/
$ps -aux | grep node (list all node processes) sasa 1208 0.3 0.2 1309856 48616 ? Ssl 2025 1687:59 node /home/sasa/dex8/dex8-panel/server/index.js sasa 1236 0.5 0.4 11822908 73376 ? Ssl 2025 2665:30 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js sasa 1257 0.3 0.2 1306264 45352 ? Ssl 2025 1708:44 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js sasa 1289 0.3 0.2 1301856 42284 ? Ssl 2025 1682:38 node /home/sasa/dex8/dex8-kiosk/server/index.js sasa 1363 4.2 3.2 12261944 529024 ? Ssl 2025 21613:27 node /home/sasa/voovuu/voovuu-pub/server/index.js sasa 1886 8.1 4.2 12377424 696684 ? Ssl 2025 41573:03 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index. sasa 1214480 0.3 0.5 22311168 91104 ? Ssl 2025 1500:05 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214483 0.3 0.2 1102592 35876 ? Ssl 2025 1382:49 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214536 0.3 0.2 1102596 35688 ? Ssl 2025 1380:55 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214544 0.3 0.2 1102568 34720 ? Ssl 2025 1392:28 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214588 0.3 0.2 1102340 35176 ? Ssl 2025 1385:30 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214617 0.3 0.2 1102464 35656 ? Ssl 2025 1380:31 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214641 0.3 0.2 1166440 34036 ? Ssl 2025 1372:04 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214671 0.3 0.2 1100128 32916 ? Ssl 2025 1365:24 node /home/sasa/dex8/dex8-worker/starter.js sasa 1216489 0.3 0.2 1101304 33408 ? Ssl 2025 1381:23 node /home/sasa/dex8/dex8-worker/starter.js sasa 1399960 0.8 0.5 11816796 87840 ? Ssl Apr20 2199:52 node /home/sasa/dex8/dex8-www/server/index.js sasa 1631573 0.6 0.3 1303652 55568 ? Ssl May31 1223:11 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr sasa 1824679 0.4 0.3 11799104 55360 ? Ssl Aug15 389:24 node /home/sasa/kriptus/kriptus-panel/server/index.js sasa 2072475 0.7 0.5 1161564 90532 ? Ssl Sep24 195:04 node /home/sasa/voovuu/voovuu-api/starter.js sasa 2075109 8.9 0.5 11711584 91092 ? Ssl Sep24 2351:38 node /home/sasa/dex8/dex8-api/starter.js sasa 2075416 0.6 0.3 1331536 56568 ? Ssl Sep24 172:14 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js sasa 2448036 1.1 0.8 11856592 131328 ? Ssl Aug21 899:44 node /home/sasa/miko/miko-hr/server/index.js sasa 2663246 2.2 0.6 11849008 100048 ? Ssl Aug23 1610:58 node /home/sasa/kriptus/kriptus-api/starter.js sasa 3168557 0.6 0.4 11832276 77460 ? Ssl 2025 3023:11 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js sasa 3169051 0.5 0.3 11799488 54252 ? Ssl 2025 2479:12 node /home/sasa/@mikosoft/dodo-examples/server/index.js sasa 3615181 0.6 0.3 1331764 63432 ? Ssl Oct07 47:40 node /home/sasa/miko/miko-hr/api/starter.js sasa 3809381 0.3 0.4 22302152 79260 ? Ssl Sep02 208:14 node /home/sasa/dex8/dex8-worker/starter.js www-data 4185171 0.0 0.0 2608 532 ? S 02:03 0:00 sh -c ps -aux | grep node www-data 4185173 0.0 0.0 3304 640 ? R 02:03 0:00 grep node