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 1304492 83812 ?       Ssl  Oct24 256:54 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.9  0.8 11722608 139596 ?     Ssl  Oct24 452:46 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1299516 67708 ?       Ssl  Oct24 209:44 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.3  0.4 1304912 72424 ?       Ssl  Oct24 183:54 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.9  0.6 11813976 99844 ?      Ssl  Oct24 445:51 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.5 11809804 97644 ?      Ssl  Oct24 281:15 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.7  0.5 1330604 83380 ?       Ssl  Oct24 374:34 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1300548 69368 ?       Ssl  Oct24 186:52 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297580 66904 ?       Ssl  Oct24 184:20 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.1  2.8 12166964 468120 ?     Ssl  Oct24 1540:07 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.3  0.3 1167592 65248 ?       Ssl  Oct24 193:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.7  2.7 33139432 449460 ?     Ssl  Oct24 870:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.3  0.3 1099876 63656 ?       Ssl  Oct24 193:03 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.3  0.3 1099364 63140 ?       Ssl  Oct24 193:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1100132 64616 ?       Ssl  Oct24 192:34 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.3  0.3 1100136 64632 ?       Ssl  Oct24 192:23 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.3  0.3 1100132 64044 ?       Ssl  Oct24 192:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.3  0.3 1100384 65060 ?       Ssl  Oct24 192:34 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.3  0.3 1100128 64128 ?       Ssl  Oct24 188:38 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.3  0.3 1099880 64240 ?       Ssl  Oct24 190:00 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.6  0.9 11856116 157548 ?     Ssl  Oct24 792:19 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     2628167  0.8  0.7 1168848 124288 ?      Ssl  Nov04 275:10 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11824076 110844 ?     Ssl  Nov06 193:57 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.4  0.5 11798408 83016 ?      Ssl  Nov06 126:53 node /home/sasa/@mikosoft/dodo-examples/server/index.js
www-data 3303644  0.0  0.0   2608   600 ?        S    07:43   0:00 sh -c ps -aux | grep node
www-data 3303646  0.0  0.0   3304   652 ?        S    07:43   0:00 grep node