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 1305552 86460 ?       Ssl   2025 1405:09 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1304488 73008 ?       Ssl   2025 998:46 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11817936 107280 ?     Ssl   2025 1578:33 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1305176 73428 ?       Ssl   2025 1012:57 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298028 67972 ?       Ssl   2025 997:28 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.5  2.8 12174148 459832 ?     Ssl   2025 13021:21 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  4.4  3.0 12167060 505116 ?     Ssl   2025 12662:05 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 125756 ?     Ssl   2025 736:34 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1101568 65828 ?       Ssl   2025 652:41 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1101060 66164 ?       Ssl   2025 651:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1102568 67008 ?       Ssl   2025 656:03 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100548 64128 ?       Ssl   2025 652:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.3 1100672 65196 ?       Ssl   2025 650:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1100648 64780 ?       Ssl   2025 641:22 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100128 63952 ?       Ssl   2025 639:03 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11714140 129804 ?     Ssl   2025 1430:10 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1100792 64884 ?       Ssl   2025 650:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.7 11829084 117200 ?     Ssl  Apr20 250:02 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1904154  0.6  0.7 11839056 118820 ?     Ssl  Apr25 141:38 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.7 1175128 130236 ?      Ssl   2025 2272:58 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11826376 101560 ?     Ssl   2025 1655:37 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 83988 ?      Ssl   2025 1370:59 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1332492 85764 ?       Ssl  Feb21 796:33 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa     3652070  0.3  0.3 1097568 62276 ?       Ssl  04:03   0:32 node /home/sasa/dex8/dex8-worker/starter.js
www-data 3664061  0.0  0.0   2608   592 ?        S    06:51   0:00 sh -c ps -aux | grep node
www-data 3664063  0.0  0.0   3304   708 ?        S    06:51   0:00 grep node