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  0.4  0.5 1305796 84464 ?       Ssl   2025 1168:44 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1304744 73104 ?       Ssl   2025 840:25 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.7  0.5 11805864 94964 ?      Ssl   2025 1869:28 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11819024 109112 ?     Ssl   2025 1329:52 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1303640 72244 ?       Ssl   2025 853:13 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298028 68460 ?       Ssl   2025 838:55 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.5  2.7 12148192 442664 ?     Ssl   2025 10658:53 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  3.5  2.3 12059052 388196 ?     Ssl   2025 8361:41 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 127228 ?     Ssl   2025 559:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1101312 65560 ?       Ssl   2025 483:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1100804 65872 ?       Ssl   2025 482:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1101288 66016 ?       Ssl   2025 485:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1101828 65472 ?       Ssl   2025 483:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100928 66116 ?       Ssl   2025 482:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1100904 64496 ?       Ssl   2025 475:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100128 63920 ?       Ssl   2025 473:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.6  0.7 11708856 123508 ?     Ssl   2025 974:36 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1101560 65924 ?       Ssl   2025 481:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2509059  0.5  0.6 11827480 106700 ?     Ssl  Feb14 426:15 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1175384 131676 ?      Ssl   2025 1888:05 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11800976 90036 ?      Ssl   2025 1356:52 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 85184 ?      Ssl   2025 1117:57 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1337252 84776 ?       Ssl  Feb21 417:06 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa     3985796  0.3  0.3 1095776 60328 ?       Ssl  04:03   0:06 node /home/sasa/dex8/dex8-worker/starter.js
www-data 3987879  0.0  0.0   2608   592 ?        S    04:34   0:00 sh -c ps -aux | grep node
www-data 3987881  0.0  0.0   3304   724 ?        S    04:34   0:00 grep node