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 1304200 82448 ?       Ssl  Oct24 300:29 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.9  0.8 11724032 141244 ?     Ssl  Oct24 531:40 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1305420 73300 ?       Ssl  Oct24 251:17 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.3  0.4 1302772 70568 ?       Ssl  Oct24 216:17 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.9  0.6 11819512 109684 ?     Ssl  Oct24 533:47 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.5 11813132 97812 ?      Ssl  Oct24 331:29 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.7  0.5 1330860 84088 ?       Ssl  Oct24 447:45 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1302728 70624 ?       Ssl  Oct24 219:35 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298104 66608 ?       Ssl  Oct24 216:22 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.1  2.9 12182580 490944 ?     Ssl  Oct24 1870:55 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.3  0.4 1167080 65584 ?       Ssl  Oct24 226:53 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.7  2.7 33122168 449980 ?     Ssl  Oct24 1026:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.3  0.4 1102948 66488 ?       Ssl  Oct24 226:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.3  0.3 1100388 64064 ?       Ssl  Oct24 226:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1100900 64544 ?       Ssl  Oct24 226:00 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.3  0.3 1101160 64992 ?       Ssl  Oct24 226:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.3  0.3 1101412 65124 ?       Ssl  Oct24 225:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.3  0.4 1167200 65604 ?       Ssl  Oct24 226:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.3  0.4 1102944 66364 ?       Ssl  Oct24 221:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.3  0.4 1102184 65644 ?       Ssl  Oct24 222:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.7  0.9 11857488 159492 ?     Ssl  Oct24 1031:42 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data  714819  0.0  0.0   2608   592 ?        S    08:48   0:00 sh -c ps -aux | grep node
www-data  714821  0.0  0.0   3304   708 ?        S    08:48   0:00 grep node
sasa     2628167  0.8  0.7 1172052 128472 ?      Ssl  Nov04 349:34 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11820244 95612 ?      Ssl  Nov06 251:10 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.4  0.5 11798664 83088 ?      Ssl  Nov06 165:22 node /home/sasa/@mikosoft/dodo-examples/server/index.js