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  0.5 1305060 84908 ?       Ssl   2025 820:19 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305000 73096 ?       Ssl   2025 584:23 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.6 11822992 111952 ?     Ssl   2025 1310:25 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.6 11816100 106176 ?     Ssl   2025 924:14 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.8  0.5 1331116 84320 ?       Ssl   2025 1272:03 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1304408 73032 ?       Ssl   2025 594:03 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1302356 71076 ?       Ssl   2025 583:33 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.4  2.7 12142460 443412 ?     Ssl   2025 6871:41 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  2.9  1.5 11947424 258308 ?     Ssl   2025 4597:16 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.4  0.7 22311424 126628 ?     Ssl   2025 272:22 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1101824 65616 ?       Ssl   2025 210:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1101828 66532 ?       Ssl   2025 209:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1100776 65468 ?       Ssl   2025 211:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1101572 64892 ?       Ssl   2025 209:57 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1101440 66088 ?       Ssl   2025 209:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.4 1102952 67204 ?       Ssl   2025 206:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.4 1102944 66232 ?       Ssl   2025 205:39 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.8  0.7 11709576 125160 ?     Ssl   2025 522:33 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1100792 64896 ?       Ssl   2025 208:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1782967  0.3  0.4 1101144 65624 ?       Ssl  03:03   1:28 node /home/sasa/dex8/dex8-worker/starter.js
www-data 1817274  0.0  0.0   2608   596 ?        S    10:34   0:00 sh -c ps -aux | grep node
www-data 1817276  0.0  0.0   3304   716 ?        S    10:34   0:00 grep node
sasa     2628167  0.9  0.7 1178044 130624 ?      Ssl   2025 1264:41 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11801320 90452 ?      Ssl   2025 898:14 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 85012 ?      Ssl   2025 706:27 node /home/sasa/@mikosoft/dodo-examples/server/index.js