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        1197  2.4  0.6 1328876 105924 ?      Ssl  Oct18  56:55 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1211 15.8  0.6 11700992 104636 ?     Ssl  Oct18 360:25 node /home/sasa/dex8/dex8-api/starter.js
sasa        1218  0.4  0.5 11798160 82412 ?      Ssl  Oct18   9:22 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1219  0.6  0.5 11812264 94268 ?      Ssl  Oct18  15:38 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1232  0.3  0.5 11797788 82536 ?      Ssl  Oct18   8:14 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1248  0.5  0.5 1329960 83512 ?       Rsl  Oct18  13:14 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1274  0.3  0.4 1298540 65604 ?       Ssl  Oct18   7:14 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1277  0.3  0.3 1297128 64196 ?       Ssl  Oct18   7:05 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1335  0.4  0.6 11835760 108044 ?     Ssl  Oct18   9:10 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1337  0.6  0.6 1153436 108264 ?      Ssl  Oct18  15:30 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1385  3.4  2.6 12163760 441880 ?     Ssl  Oct18  77:36 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1387  0.3  0.4 11796032 80112 ?      Ssl  Oct18   7:30 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1457  0.3  0.3 1100896 65120 ?       Ssl  Oct18   7:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1458  0.3  0.3 1100904 65292 ?       Ssl  Oct18   7:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1514  0.3  0.3 1101028 65288 ?       Ssl  Oct18   7:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1515  0.3  0.3 1100900 65108 ?       Ssl  Oct18   7:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1593  0.3  0.3 1100896 65256 ?       Ssl  Oct18   7:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1595  0.3  0.4 1100896 66112 ?       Ssl  Oct18   7:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1660  0.3  0.3 1100528 64576 ?       Ssl  Oct18   7:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1661  0.3  0.3 1100384 64608 ?       Ssl  Oct18   7:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1732  0.3  0.3 1100384 64736 ?       Ssl  Oct18   7:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1734  0.3  0.3 1100896 65132 ?       Ssl  Oct18   7:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1792  0.4  0.5 11746084 93128 ?      Ssl  Oct18   9:25 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data  192290  0.0  0.0   2608   596 ?        S    03:19   0:00 sh -c ps -aux | grep node
www-data  192292  0.0  0.0   3304   644 ?        S    03:19   0:00 grep node