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        1208  0.3  0.4 1316328 75576 ?       Ssl   2025 1251:24 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11818548 101960 ?     Ssl   2025 1976:05 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304840 72396 ?       Ssl   2025 1267:31 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1299184 67428 ?       Ssl   2025 1248:40 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.2  3.2 12277868 526140 ?     Ssl   2025 15686:47 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  6.1  3.5 12248240 584560 ?     Ssl   2025 22613:43 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 125748 ?     Ssl   2025 1016:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101568 65388 ?       Ssl   2025 920:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1103108 67496 ?       Ssl   2025 918:56 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1101544 66332 ?       Ssl   2025 926:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1101316 65360 ?       Ssl   2025 921:21 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100672 65560 ?       Ssl   2025 918:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1166184 64992 ?       Ssl   2025 909:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.4 1102176 66672 ?       Ssl   2025 905:23 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.6  0.7 11844700 124964 ?     Ssl   2025 1873:39 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1102328 66732 ?       Ssl   2025 918:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.7 11821148 117068 ?     Ssl  Apr20 921:38 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1407255  0.3  0.5 22291988 95028 ?      Ssl  Jul05   7:20 node /home/sasa/dex8/dex8-worker/starter.js
www-data 1597296  0.0  0.0   2608   532 ?        S    16:56   0:00 sh -c ps -aux | grep node
www-data 1597298  0.0  0.0   3304   712 ?        S    16:56   0:00 grep node
sasa     1631573  0.4  0.5 1303784 82796 ?       Ssl  May31 227:21 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa     1904154  0.6  0.8 11856244 142104 ?     Ssl  Apr25 644:04 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.7 1175004 129704 ?      Ssl   2025 2827:30 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11824472 100224 ?     Ssl   2025 2140:49 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799488 84600 ?      Ssl   2025 1775:30 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1332680 86104 ?       Ssl  Feb21 1367:41 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js