/*
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 75692 ? Ssl 2025 1561:51 node /home/sasa/dex8/dex8-panel/server/index.js sasa 1236 0.5 0.6 11821252 99184 ? Ssl 2025 2466:13 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js sasa 1257 0.3 0.4 1307748 74724 ? Ssl 2025 1580:52 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js sasa 1289 0.3 0.4 1301520 68964 ? Ssl 2025 1557:20 node /home/sasa/dex8/dex8-kiosk/server/index.js sasa 1363 4.2 3.4 12262100 562848 ? Ssl 2025 20042:36 node /home/sasa/voovuu/voovuu-pub/server/index.js sasa 1886 7.5 3.7 12280708 616756 ? Ssl 2025 35315:06 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index. www-data 1024214 0.0 0.0 2608 528 ? S 23:31 0:00 sh -c ps -aux | grep node www-data 1024216 0.0 0.0 3304 644 ? S 23:31 0:00 grep node sasa 1214480 0.3 0.7 22311168 123720 ? Ssl 2025 1360:54 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214483 0.3 0.3 1101824 64416 ? Ssl 2025 1249:22 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214536 0.3 0.3 1100548 64232 ? Ssl 2025 1247:43 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214544 0.3 0.3 1102312 65364 ? Ssl 2025 1257:59 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214588 0.3 0.3 1102084 64476 ? Ssl 2025 1251:33 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214617 0.3 0.4 1101952 65680 ? Ssl 2025 1247:07 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214641 0.3 0.3 1166440 64128 ? Ssl 2025 1238:37 node /home/sasa/dex8/dex8-worker/starter.js sasa 1214671 0.3 0.3 1100128 63324 ? Ssl 2025 1232:40 node /home/sasa/dex8/dex8-worker/starter.js sasa 1215731 0.9 0.7 11846980 122896 ? Ssl 2025 3440:11 node /home/sasa/dex8/dex8-api/starter.js sasa 1216489 0.3 0.3 1101560 64188 ? Ssl 2025 1247:41 node /home/sasa/dex8/dex8-worker/starter.js sasa 1399960 0.8 0.6 11807484 107536 ? Ssl Apr20 1853:08 node /home/sasa/dex8/dex8-www/server/index.js sasa 1631573 0.5 0.4 1303876 81764 ? Ssl May31 776:37 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr sasa 1824679 0.4 0.5 11798848 83392 ? Ssl Aug15 199:31 node /home/sasa/kriptus/kriptus-panel/server/index.js sasa 2448036 1.2 0.9 11859684 159008 ? Ssl Aug21 452:18 node /home/sasa/miko/miko-hr/server/index.js sasa 2628167 0.7 0.7 1176540 130216 ? Ssl 2025 3578:35 node /home/sasa/voovuu/voovuu-api/starter.js sasa 2663246 2.4 0.7 11847324 129408 ? Ssl Aug23 791:28 node /home/sasa/kriptus/kriptus-api/starter.js sasa 3168557 0.6 0.6 11827140 102180 ? Ssl 2025 2763:40 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js sasa 3169051 0.5 0.5 11799488 82664 ? Ssl 2025 2275:30 node /home/sasa/@mikosoft/dodo-examples/server/index.js sasa 3264954 0.6 0.5 1333120 85976 ? Ssl Feb21 2052:12 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js sasa 3358795 0.6 0.5 1266904 89004 ? Ssl Aug29 149:07 node /home/sasa/miko/miko-hr/api/starter.js sasa 3809381 0.3 0.5 11804452 94244 ? Ssl Sep02 62:33 node /home/sasa/dex8/dex8-worker/starter.js