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 84552 ?       Ssl   2025 1492:02 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1304744 71360 ?       Ssl   2025 1062:09 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11821604 104904 ?     Ssl   2025 1678:29 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1310848 74784 ?       Ssl   2025 1077:17 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298092 67768 ?       Ssl   2025 1060:46 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.4  2.6 12144252 441612 ?     Ssl   2025 13748:03 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  4.9  3.4 12227136 566072 ?     Ssl   2025 15045:30 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      978713  0.3  0.3 1098332 62876 ?       Ssl  04:03   0:45 node /home/sasa/dex8/dex8-worker/starter.js
www-data  996213  0.0  0.0   2608   588 ?        S    07:57   0:00 sh -c ps -aux | grep node
www-data  996215  0.0  0.0   3304   712 ?        S    07:57   0:00 grep node
sasa     1214480  0.3  0.7 22311168 125264 ?     Ssl   2025 807:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1102848 66480 ?       Ssl   2025 719:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1101060 65548 ?       Ssl   2025 718:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1101544 65620 ?       Ssl   2025 723:56 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1101316 64964 ?       Ssl   2025 720:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100672 66064 ?       Ssl   2025 718:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1166184 65044 ?       Ssl   2025 708:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1099872 64020 ?       Ssl   2025 705:42 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11845468 126976 ?     Ssl   2025 1541:42 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1102840 66596 ?       Ssl   2025 717:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.6 11817308 113888 ?     Ssl  Apr20 417:37 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1904154  0.5  0.6 11825660 102776 ?     Ssl  Apr25 257:52 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1176408 132156 ?      Ssl   2025 2416:33 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11803448 92924 ?      Ssl   2025 1770:12 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 83732 ?      Ssl   2025 1472:12 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1332492 86336 ?       Ssl  Feb21 942:39 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js