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         831  0.4  0.4 1302140 73300 ?       Ssl  Jun15   6:38 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa         843  0.4  0.6 11696264 100340 ?     Ssl  Jun15   6:02 node /home/sasa/dex8/dex8-api/starter.js
sasa         858  0.3  0.3 1032208 60292 ?       Ssl  Jun15   4:49 node /home/sasa/regoch/regoch-www/server
sasa         867  0.3  0.3 1292724 59092 ?       Ssl  Jun15   4:43 node /home/sasa/dex8/dex8-panel/server/index.js
sasa         886  0.7  0.5 11818120 90736 ?      Ssl  Jun15  10:34 node /home/sasa/dex8/dex8-www/server/index.js
sasa         888  0.3  0.4 11789848 73688 ?      Ssl  Jun15   5:05 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         904  0.6  0.5 1329612 82004 ?       Ssl  Jun15   8:37 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         910  0.3  0.3 1296900 64288 ?       Ssl  Jun15   4:42 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa         969  0.3  0.3 1027636 54520 ?       Ssl  Jun15   4:39 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa         970  0.4  0.5 11824124 97376 ?      Ssl  Jun15   6:28 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1010  0.4  0.5 1138520 92372 ?       Ssl  Jun15   5:59 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1016  0.6  0.6 11808668 101696 ?     Ssl  Jun15   8:24 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1086  0.3  0.4 11595744 74720 ?      Ssl  Jun15   5:00 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1089  0.3  0.3 1099356 64696 ?       Ssl  Jun15   4:53 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1159  0.3  0.3 1099360 64508 ?       Ssl  Jun15   4:51 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1160  0.3  0.3 1099356 63552 ?       Ssl  Jun15   4:52 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1241  0.3  0.3 1100696 62264 ?       Ssl  Jun15   4:49 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1242  0.3  0.4 22275868 74244 ?      Ssl  Jun15   5:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1323  0.3  0.3 1099356 63792 ?       Ssl  Jun15   4:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1324  0.3  0.3 1099360 63572 ?       Ssl  Jun15   4:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1398  0.3  0.3 1099360 64188 ?       Ssl  Jun15   4:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1400  0.3  0.3 1099356 64000 ?       Ssl  Jun15   4:51 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1465  0.3  0.3 1099360 63772 ?       Ssl  Jun15   4:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1475  0.4  0.7 11837824 118844 ?     Ssl  Jun15   5:22 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data   66903  0.0  0.0   2608   600 ?        S    01:42   0:00 sh -c ps -aux | grep node
www-data   66905  0.0  0.0   3304   732 ?        S    01:42   0:00 grep node