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 1303844 83336 ?       Ssl  Oct24 184:24 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.9  0.8 11721912 137504 ?     Ssl  Oct24 315:43 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1305072 73556 ?       Ssl  Oct24 145:35 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.4  0.4 1304912 72676 ?       Ssl  Oct24 132:05 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  1.0  0.6 11825444 104308 ?     Ssl  Oct24 330:47 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.5 11813132 97556 ?      Ssl  Oct24 199:48 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.7  0.5 1329104 81924 ?       Ssl  Oct24 258:11 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.4  0.4 1300740 70064 ?       Ssl  Oct24 134:01 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.4  0.4 1297184 65784 ?       Ssl  Oct24 132:21 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.1  2.7 12169076 445568 ?     Ssl  Oct24 1031:28 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.4  0.4 1168872 67432 ?       Ssl  Oct24 138:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.7  2.6 22607304 430296 ?     Ssl  Oct24 564:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.4  0.3 1100644 64656 ?       Ssl  Oct24 138:43 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.4  0.3 1100644 64452 ?       Ssl  Oct24 138:49 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.4  0.3 1100900 64812 ?       Ssl  Oct24 138:21 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.4  0.4 1100904 66308 ?       Ssl  Oct24 137:59 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.4  0.3 1100900 65500 ?       Ssl  Oct24 138:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.4  0.3 1100640 65488 ?       Ssl  Oct24 138:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.4  0.3 1100128 63844 ?       Ssl  Oct24 135:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.4  0.3 1099112 63816 ?       Ssl  Oct24 136:05 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.4  0.8 11841760 144008 ?     Ssl  Oct24 476:10 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data  438677  0.0  0.0   2608   536 ?        S    07:14   0:00 sh -c ps -aux | grep node
www-data  438679  0.0  0.0   3304   656 ?        S    07:14   0:00 grep node
sasa     2628167  0.9  0.7 1161268 116396 ?      Ssl  Nov04 156:56 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.7  0.5 11819684 93248 ?      Ssl  Nov06  98:44 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.4  0.5 11798408 83188 ?      Ssl  Nov06  67:13 node /home/sasa/@mikosoft/dodo-examples/server/index.js