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 1304292 81280 ?       Ssl  Oct24  97:20 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.9  0.8 11723284 135840 ?     Ssl  Oct24 175:31 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1303480 71600 ?       Ssl  Oct24  74:14 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.3  0.4 1304912 72512 ?       Ssl  Oct24  69:27 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  1.0  0.6 11833800 114444 ?     Ssl  Oct24 191:52 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.5 11810828 96788 ?      Ssl  Oct24 101:18 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.7  0.4 1329104 81140 ?       Ssl  Oct24 133:26 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1298500 66460 ?       Ssl  Oct24  70:25 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.3 1296872 64776 ?       Ssl  Oct24  69:23 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1292  0.5  0.5 11797252 86724 ?      Ssl  Oct24 108:56 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1363  2.9  2.7 12149580 446732 ?     Ssl  Oct24 538:41 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1441  0.4  0.4 11794584 77948 ?      Ssl  Oct24  74:59 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1449  0.3  0.3 1165544 63612 ?       Ssl  Oct24  72:51 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.9  2.4 22580728 402564 ?     Ssl  Oct24 350:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.3  0.3 1099620 63252 ?       Ssl  Oct24  72:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.3  0.3 1098852 62768 ?       Ssl  Oct24  72:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1099620 64064 ?       Ssl  Oct24  72:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.3  0.3 1099624 64336 ?       Ssl  Oct24  72:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.3  0.3 1099364 63392 ?       Ssl  Oct24  72:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.3  0.3 1100384 65000 ?       Ssl  Oct24  72:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.3  0.3 1100128 64068 ?       Ssl  Oct24  71:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.3  0.3 1098856 63660 ?       Ssl  Oct24  71:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.1  0.8 11838092 136824 ?     Ssl  Oct24 203:22 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     2628167  0.8  0.6 1152976 105164 ?      Ssl  Nov04  18:55 node /home/sasa/voovuu/voovuu-api/starter.js
www-data 3018177  0.0  0.0   2608   600 ?        S    06:55   0:00 sh -c ps -aux | grep node
www-data 3018179  0.0  0.0   3304   712 ?        S    06:55   0:00 grep node