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 1305256 72264 ?       Ssl   2025 1186:58 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11818836 104032 ?     Ssl   2025 1875:16 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.3 1305096 65352 ?       Ssl   2025 1203:23 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298172 67304 ?       Ssl   2025 1185:06 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.3  2.9 12270856 480308 ?     Ssl   2025 15083:50 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  5.8  3.5 12252776 588428 ?     Ssl   2025 20135:04 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 125696 ?     Ssl   2025 946:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1102080 66212 ?       Ssl   2025 852:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1101060 65904 ?       Ssl   2025 851:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1101288 65160 ?       Ssl   2025 857:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1101060 64896 ?       Ssl   2025 853:28 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100672 65916 ?       Ssl   2025 850:44 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.4 1167208 65928 ?       Ssl   2025 841:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100384 64948 ?       Ssl   2025 837:56 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.6  0.7 11844444 124976 ?     Ssl   2025 1761:12 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1101560 65524 ?       Ssl   2025 850:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.7 11820556 116964 ?     Ssl  Apr20 745:04 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1631573  0.4  0.4 1303148 79544 ?       Ssl  May31 138:13 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa     1904154  0.6  0.8 11860548 142488 ?     Ssl  Apr25 509:25 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.7 1177564 130180 ?      Ssl   2025 2688:16 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11835352 110512 ?     Ssl   2025 2009:57 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799488 84072 ?      Ssl   2025 1672:27 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1332424 86288 ?       Ssl  Feb21 1227:23 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa     4033471  0.3  0.6 22312148 101748 ?     Ssl  Jun21   6:20 node /home/sasa/dex8/dex8-worker/starter.js
www-data 4180673  0.0  0.0   2608   596 ?        S    11:54   0:00 sh -c ps -aux | grep node
www-data 4180675  0.0  0.0   3304   648 ?        S    11:54   0:00 grep node