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  0.4 1303696 81172 ?       Ssl  Oct24 411:06 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  1.0  0.8 11724288 140608 ?     Ssl  Oct24 736:03 node /home/sasa/dex8/dex8-api/starter.js
sasa        1208  0.4  0.4 1304232 73700 ?       Ssl  Oct24 296:15 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  1.0  0.7 11838516 118828 ?     Ssl  Oct24 713:14 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.6 11813132 98904 ?      Ssl  Oct24 465:13 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.9  0.5 1330860 84036 ?       Ssl  Oct24 625:24 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.4  0.4 1301060 70192 ?       Ssl  Oct24 301:24 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.4  0.4 1298192 67196 ?       Ssl  Oct24 296:16 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.4  2.7 12144508 447352 ?     Ssl  Oct24 2391:46 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.4  0.3 1232104 64364 ?       Ssl  Oct24 311:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.9  2.6 33113424 441432 ?     Ssl  Oct24 1373:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.4  0.3 1101156 64804 ?       Ssl  Oct24 310:21 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.4  0.3 1101668 65384 ?       Ssl  Oct24 311:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.4  0.3 1101412 65484 ?       Ssl  Oct24 310:30 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.4  0.4 1101928 66652 ?       Ssl  Oct24 310:18 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.4  0.4 1102436 66336 ?       Ssl  Oct24 309:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.4  0.4 1168224 67300 ?       Ssl  Oct24 310:44 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.4  0.3 1101408 65152 ?       Ssl  Oct24 303:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.4  0.3 1100648 64828 ?       Ssl  Oct24 305:07 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  2.3  1.0 11862700 165732 ?     Ssl  Oct24 1598:56 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data 2530044  0.0  0.0   2608   596 ?        S    11:36   0:00 sh -c ps -aux | grep node
www-data 2530046  0.0  0.0   3304   712 ?        S    11:36   0:00 grep node
sasa     2628167  1.0  0.7 1176348 130420 ?      Ssl  Nov04 532:56 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.7  0.5 11803896 90408 ?      Ssl  Nov06 397:04 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798664 83732 ?      Ssl  Nov06 265:50 node /home/sasa/@mikosoft/dodo-examples/server/index.js