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 1304776 83184 ?       Ssl   2025 949:10 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1303720 71868 ?       Ssl   2025 679:48 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.9 11882720 148288 ?     Ssl   2025 1509:40 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11821936 105484 ?     Ssl   2025 1075:21 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1305176 73472 ?       Ssl   2025 690:26 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298092 67484 ?       Ssl   2025 678:36 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.5  2.8 12168928 468440 ?     Ssl   2025 8438:31 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  3.1  1.6 11955032 265340 ?     Rsl   2025 5740:09 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.4  0.7 22311424 125924 ?     Ssl   2025 378:49 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101056 65460 ?       Ssl   2025 311:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1102596 67144 ?       Ssl   2025 310:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1102824 66960 ?       Ssl   2025 313:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100548 64424 ?       Ssl   2025 311:39 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1102720 67392 ?       Ssl   2025 310:56 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.4 1101672 66032 ?       Ssl   2025 306:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1101920 65016 ?       Ssl   2025 305:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11709320 123532 ?     Ssl   2025 690:55 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1103096 66936 ?       Ssl   2025 310:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2509059  0.6  0.5 11802264 93172 ?      Ssl  Feb14 131:53 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.7 1176152 130612 ?      Ssl   2025 1505:01 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11814096 96880 ?      Ssl   2025 1067:58 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 84960 ?      Ssl   2025 859:52 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1330464 82788 ?       Ssl  Feb21  67:41 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa     4056234  0.3  0.4 1102688 67520 ?       Ssl  03:02   1:54 node /home/sasa/dex8/dex8-worker/starter.js
www-data 4104986  0.0  0.0   2608   524 ?        S    12:33   0:00 sh -c ps -aux | grep node
www-data 4104988  0.0  0.0   3304   712 ?        S    12:33   0:00 grep node