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        1194  0.5  0.4 1303716 81892 ?       Ssl  Oct24 519:52 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  1.0  0.8 11722608 138412 ?     Ssl  Oct24 910:25 node /home/sasa/dex8/dex8-api/starter.js
sasa        1208  0.4  0.4 1305000 73800 ?       Ssl  Oct24 375:08 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.9  0.7 11835788 118004 ?     Ssl  Oct24 879:49 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.6 11810572 99452 ?      Ssl  Oct24 590:53 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.8  0.5 1330860 83372 ?       Ssl  Oct24 804:36 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.4  0.4 1304920 73948 ?       Ssl  Oct24 382:00 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.4  0.4 1297964 66788 ?       Ssl  Oct24 374:45 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.0  2.8 12156740 466000 ?     Ssl  Oct24 3707:25 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.4  0.3 1232360 64852 ?       Ssl  Oct24 394:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.4  0.4 1102948 67180 ?       Ssl  Oct24 393:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.4  0.4 1102692 66936 ?       Ssl  Oct24 394:41 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.4  0.4 1102436 66668 ?       Ssl  Oct24 393:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.4  0.4 1103208 67468 ?       Ssl  Oct24 392:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.4  0.3 1101412 64752 ?       Ssl  Oct24 392:18 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.4  0.4 1168736 67480 ?       Ssl  Oct24 393:30 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.4  0.3 1100640 63816 ?       Ssl  Oct24 384:21 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.4  0.3 1100136 63896 ?       Ssl  Oct24 386:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  2.5  1.0 11869468 170252 ?     Ssl  Oct24 2310:18 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      926007  0.3  0.4 22275352 75964 ?      Ssl  03:04   1:35 node /home/sasa/dex8/dex8-worker/starter.js
www-data  958018  0.0  0.0   2608   596 ?        S    10:24   0:00 sh -c ps -aux | grep node
www-data  958020  0.0  0.0   3304   644 ?        S    10:24   0:00 grep node
sasa     2628167  1.0  0.7 1174376 130576 ?      Ssl  Nov04 744:54 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.7  0.5 11801288 91832 ?      Ssl  Nov06 537:02 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 83512 ?      Ssl  Nov06 374:32 node /home/sasa/@mikosoft/dodo-examples/server/index.js