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 1310176 76408 ?       Ssl   2025 1314:26 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11823568 103800 ?     Ssl   2025 2075:11 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304840 72620 ?       Ssl   2025 1330:43 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1302464 68844 ?       Ssl   2025 1311:22 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.2  3.1 12234444 519444 ?     Ssl   2025 16335:49 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  6.5  3.5 12251404 586704 ?     Ssl   2025 25210:20 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 125792 ?     Ssl   2025 1087:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101312 65088 ?       Ssl   2025 987:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1101060 66352 ?       Ssl   2025 985:56 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1101544 66304 ?       Ssl   2025 993:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.4 1102596 66332 ?       Ssl   2025 988:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1101952 66944 ?       Ssl   2025 985:18 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1166184 64572 ?       Ssl   2025 976:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.4 1102688 66660 ?       Ssl   2025 972:05 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11844964 124628 ?     Ssl   2025 2118:19 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1101560 65284 ?       Ssl   2025 985:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.7 11826524 114780 ?     Ssl  Apr20 1109:46 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1631573  0.4  0.4 1304012 81472 ?       Ssl  May31 327:19 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa     1904154  0.6  0.8 11834228 136452 ?     Ssl  Apr25 839:34 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.7  0.7 1175516 130000 ?      Ssl   2025 2968:04 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     2969463  0.3  0.5 22291616 95416 ?      Ssl  Jul19   7:31 node /home/sasa/dex8/dex8-worker/starter.js
www-data 3145351  0.0  0.0   2608   532 ?        S    17:54   0:00 sh -c ps -aux | grep node
www-data 3145353  0.0  0.0   3304   716 ?        S    17:54   0:00 grep node
sasa     3168557  0.6  0.6 11830932 107460 ?     Ssl   2025 2295:10 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799488 83960 ?      Ssl   2025 1876:54 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1333192 87032 ?       Ssl  Feb21 1509:05 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js