Test JS script file

Selected file: fs-sync2.js
Compare console.log() outputs in browser and NodeJS.
Notice: Open browser's console in FireBUG!

  1. 05define_functions.js
  2. 10module_basic1.js
  3. 10module_basic2.js
  4. 10module_basic3.js
  5. 11module_nesting.js
  6. file.js
  7. fs-async.js
  8. fs-async2.js
  9. fs-async3.js
  10. fs-sync.js
  11. fs-sync2.js
  12. http.js
  13. index.html
  14. index.js
  15. my_modules
  16. net.js
  17. npm-debug.log
  18. package.json
  19. promises
  20. socket.js
  21. sys.js
  22. testfiles

..:: Source code - fs-sync2.js ::..

/*
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.
 */
 

..:: NodeJS Console - fs-sync2.js ::..

$ node fs-sync2.js 

		
		


		
		
$ps -aux | grep node (list all node processes)
sasa        1208  0.3  0.4 1304744 72024 ?       Ssl   2025 1124:47 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11819480 104720 ?     Ssl   2025 1777:15 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304328 72960 ?       Ssl   2025 1140:19 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298192 66752 ?       Ssl   2025 1123:14 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.3  2.7 12147836 445576 ?     Ssl   2025 14250:24 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  5.3  3.5 12237560 576540 ?     Ssl   2025 17583:42 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 125732 ?     Ssl   2025 877:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101312 65156 ?       Ssl   2025 786:39 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1102852 68300 ?       Ssl   2025 785:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1102312 66212 ?       Ssl   2025 791:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1101316 65100 ?       Ssl   2025 787:09 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.3 1100672 65084 ?       Ssl   2025 784:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1166952 65396 ?       Ssl   2025 775:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100128 65156 ?       Ssl   2025 772:01 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11844700 125028 ?     Ssl   2025 1651:51 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1102072 65588 ?       Ssl   2025 784:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.7 11826344 124888 ?     Ssl  Apr20 566:51 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1631573  0.4  0.4 1302312 78136 ?       Ssl  May31  51:39 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa     1904154  0.6  0.9 11883864 148164 ?     Ssl  Apr25 383:47 node /home/sasa/miko/miko-hr/server/index.js
sasa     2488146  0.3  0.6 22304900 99652 ?      Ssl  Jun07   6:00 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2628167  0.8  0.8 1177308 132024 ?      Ssl   2025 2547:03 node /home/sasa/voovuu/voovuu-api/starter.js
www-data 2640738  0.0  0.0   2608   592 ?        S    10:57   0:00 sh -c ps -aux | grep node
www-data 2640740  0.0  0.0   3304   712 ?        S    10:57   0:00 grep node
sasa     3168557  0.6  0.7 11833144 117388 ?     Ssl   2025 1888:29 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 84568 ?      Ssl   2025 1572:28 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1332680 86660 ?       Ssl  Feb21 1086:16 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js