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         890  0.5  0.5 11797020 84156 ?      Ssl   2024 1532:16 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         903  0.7  0.5 1331320 84408 ?       Ssl   2024 2172:18 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         929  0.3  0.4 1302328 70700 ?       Ssl   2024 1024:56 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa         943  0.3  0.4 1303368 69404 ?       Ssl   2024 1003:16 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa         980  0.5  0.6 11818020 101956 ?     Ssl   2024 1648:31 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa         981  0.5  0.6 1153712 109248 ?      Ssl   2024 1702:49 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1039  0.8  1.8 12072024 304912 ?     Ssl   2024 2507:50 node /home/sasa/voovuu/voovuu-pub/server/index.js
www-data 1238454  0.0  0.0   2608   600 ?        S    19:44   0:00 sh -c ps -aux | grep node
www-data 1238456  0.0  0.0   3304   652 ?        S    19:44   0:00 grep node
sasa     1788108  0.4  0.5 11803828 89072 ?      Ssl  Mar16 234:34 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1790865  0.7  0.6 11826528 106112 ?     Ssl  Jan30 868:43 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1791369  0.7  0.8 11789608 140844 ?     Ssl  Jan30 870:17 node /home/sasa/dex8/dex8-api/starter.js
sasa     2044488  0.3  0.4 1300372 70024 ?       Ssl   2024 871:44 node /home/sasa/dex8/dex8-panel/server/index.js
sasa     2574087  0.3  0.4 11795224 79664 ?      Ssl   2024 956:11 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3598766  0.3  0.3 1100892 65556 ?       Ssl   2024 589:07 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598767  0.3  0.4 22280304 81060 ?      Ssl   2024 599:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598774  0.3  0.4 1100896 66464 ?       Ssl   2024 591:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598775  0.3  0.4 1101920 66300 ?       Ssl   2024 592:51 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598802  0.6  1.0 22350028 178580 ?     Ssl   2024 1083:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598803  0.3  0.4 1102944 67716 ?       Ssl   2024 589:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598851  0.3  0.4 1102180 67072 ?       Ssl   2024 589:49 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598853  0.3  0.4 1101924 68212 ?       Ssl   2024 589:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598925  0.3  0.5 1330432 83304 ?       Ssl   2024 613:52 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598927  0.3  0.4 1300236 69620 ?       Ssl   2024 590:26 node /home/sasa/dex8/dex8-worker/starter.js