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 1304060 82736 ?       Ssl  Oct24 190:54 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.9  0.8 11723704 137540 ?     Ssl  Oct24 328:31 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1305072 73228 ?       Ssl  Oct24 151:12 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.4  0.4 1304912 71840 ?       Ssl  Oct24 136:45 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.9  0.5 11811620 97896 ?      Ssl  Oct24 340:35 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.5 11813132 98064 ?      Ssl  Oct24 207:08 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.7  0.5 1330264 82140 ?       Ssl  Oct24 267:31 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.4  0.4 1300548 68076 ?       Ssl  Oct24 138:45 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.4  0.4 1297184 65704 ?       Ssl  Oct24 137:02 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.2  3.1 12198548 509336 ?     Ssl  Oct24 1105:06 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.4  0.3 1165288 63964 ?       Ssl  Oct24 143:44 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.7  2.6 22623728 434856 ?     Ssl  Oct24 596:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.4  0.4 1102948 67260 ?       Ssl  Oct24 143:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.4  0.4 1102948 66336 ?       Ssl  Oct24 143:41 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.4  0.3 1099620 63596 ?       Ssl  Oct24 143:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.4  0.3 1099624 64192 ?       Ssl  Oct24 142:53 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.4  0.3 1099364 63868 ?       Ssl  Oct24 143:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.4  0.4 1102944 68088 ?       Ssl  Oct24 143:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.4  0.3 1100640 64856 ?       Ssl  Oct24 140:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.4  0.3 1099880 64500 ?       Ssl  Oct24 140:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.4  0.8 11840224 141636 ?     Ssl  Oct24 499:48 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data  728048  0.0  0.0   2608   600 ?        S    07:20   0:00 sh -c ps -aux | grep node
www-data  728050  0.0  0.0   3304   708 ?        S    07:20   0:00 grep node
sasa     2628167  0.9  0.7 1161668 117544 ?      Ssl  Nov04 168:30 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11821744 107428 ?     Ssl  Nov06 107:22 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.4  0.5 11798408 83496 ?      Ssl  Nov06  72:31 node /home/sasa/@mikosoft/dodo-examples/server/index.js