/*
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 0.4 1309952 75336 ? Ssl 2025 1499:17 node /home/sasa/dex8/dex8-panel/server/index.js sasa 1236 0.5 0.6 11822276 99608 ? Ssl 2025 2367:33 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js sasa 1257 0.3 0.4 1307236 73848 ? Ssl 2025 1517:48 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js sasa 1289 0.3 0.4 1301520 69372 ? Ssl 2025 1495:11 node /home/sasa/dex8/dex8-kiosk/server/index.js sasa 1363 4.2 3.6 12295524 594104 ? Ssl 2025 19236:30 node /home/sasa/voovuu/voovuu-pub/server/index.js sasa 1886 7.2 3.6 12272764 603908 ? Ssl 2025 32628:02 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index. sasa 1214480 0.3 0.7 22311168 124764 ? Ssl 2025 1291:32 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214483 0.3 0.3 1101568 64640 ? Ssl 2025 1183:04 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214536 0.3 0.3 1100804 64144 ? Ssl 2025 1181:28 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214544 0.3 0.3 1102056 64956 ? Ssl 2025 1191:06 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214588 0.3 0.4 1103364 65956 ? Ssl 2025 1184:56 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214617 0.3 0.4 1102464 66952 ? Ssl 2025 1180:47 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214641 0.3 0.3 1166440 63968 ? Ssl 2025 1172:17 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214671 0.3 0.3 1100384 63012 ? Ssl 2025 1166:39 node /home/sasa/dex8/dex8-worker/starter.js sasa 1215731 0.8 0.7 11847748 124076 ? Ssl 2025 3064:19 node /home/sasa/dex8/dex8-api/starter.js sasa 1216489 0.3 0.3 1101560 64256 ? Ssl 2025 1181:15 node /home/sasa/dex8/dex8-worker/starter.js sasa 1399960 0.8 0.7 11857868 129500 ? Ssl Apr20 1673:19 node /home/sasa/dex8/dex8-www/server/index.js sasa 1631573 0.4 0.5 1303876 82308 ? Ssl May31 657:34 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr sasa 1824679 0.4 0.5 11798592 82772 ? Ssl Aug15 105:54 node /home/sasa/kriptus/kriptus-panel/server/index.js sasa 2448036 0.9 0.8 11852236 147144 ? Ssl Aug21 146:41 node /home/sasa/miko/miko-hr/server/index.js sasa 2628167 0.7 0.7 1177820 129668 ? Ssl 2025 3431:38 node /home/sasa/voovuu/voovuu-api/starter.js sasa 2663246 2.8 0.7 11855620 130828 ? Ssl Aug23 340:27 node /home/sasa/kriptus/kriptus-api/starter.js sasa 3168557 0.6 0.6 11840304 99292 ? Ssl 2025 2643:37 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js sasa 3169051 0.5 0.5 11799488 82836 ? Ssl 2025 2174:38 node /home/sasa/@mikosoft/dodo-examples/server/index.js sasa 3264954 0.6 0.5 1332936 86196 ? Ssl Feb21 1914:35 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js sasa 3358795 0.5 0.5 1264852 86272 ? Ssl Aug29 18:02 node /home/sasa/miko/miko-hr/api/starter.js sasa 3436240 0.3 0.5 22293488 97352 ? Ssl Aug30 8:22 node /home/sasa/dex8/dex8-worker/starter.js www-data 3661038 0.0 0.0 2608 592 ? S 22:31 0:00 sh -c ps -aux | grep node www-data 3661040 0.0 0.0 3304 652 ? S 22:31 0:00 grep node