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         849  0.5  0.5 1317632 86532 ?       Ssl  Oct08 282:54 node /home/sasa/regoch/regoch-www/server
sasa         880  0.4  0.5 1319240 88104 ?       Ssl  Oct08 235:33 node /home/sasa/dex8/dex8-www/server/index.js
sasa         890  0.5  0.5 11797800 85060 ?      Ssl  Oct08 334:12 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         903  0.7  0.5 1329652 82224 ?       Ssl  Oct08 430:40 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         929  0.4  0.4 1300184 68704 ?       Ssl  Oct08 226:06 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa         943  0.4  0.4 1300808 66524 ?       Ssl  Oct08 233:13 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa         980  0.6  0.5 11805104 92468 ?      Ssl  Oct08 364:24 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa         981  0.7  0.6 1148036 104724 ?      Ssl  Oct08 394:47 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1039  0.9  1.4 11953572 245604 ?     Ssl  Oct08 554:51 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa     2044488  0.3  0.4 1298112 67000 ?       Ssl  Nov01  77:12 node /home/sasa/dex8/dex8-panel/server/index.js
sasa     2574087  0.3  0.4 11792920 77644 ?      Ssl  Nov08  41:46 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     2702010  0.4  0.6 22296952 100280 ?     Ssl  Nov10  34:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702011  0.3  0.4 1100276 66772 ?       Ssl  Nov10  31:05 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702018  0.3  0.3 1099884 64988 ?       Ssl  Nov10  31:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702019  0.3  0.4 1100516 66524 ?       Ssl  Nov10  31:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702046  0.9  0.7 22311780 124300 ?     Ssl  Nov10  84:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702047  0.3  0.3 1099492 65024 ?       Ssl  Nov10  31:23 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702088  0.3  0.4 1100008 66176 ?       Ssl  Nov10  31:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702089  0.3  0.4 1099752 65804 ?       Ssl  Nov10  31:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702137  0.3  0.4 1099864 66124 ?       Ssl  Nov10  30:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702139  0.4  0.6 22297196 101636 ?     Ssl  Nov10  35:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3097623  1.1  0.8 11716736 131508 ?     Ssl  Nov13  43:53 node /home/sasa/dex8/dex8-api/starter.js
www-data 3363096  0.0  0.0   2608   600 ?        S    07:42   0:00 sh -c ps -aux | grep node
www-data 3363098  0.0  0.0   3304   664 ?        S    07:42   0:00 grep node