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  0.5  0.5 1305148 83512 ?       Ssl   2025 863:41 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1304232 72844 ?       Ssl   2025 616:37 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.7 11840864 120764 ?     Ssl   2025 1376:54 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11818604 107264 ?     Ssl   2025 975:09 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.8  0.5 1331116 85008 ?       Ssl   2025 1342:16 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1304152 71900 ?       Ssl   2025 626:34 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298576 67888 ?       Ssl   2025 615:37 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.4  3.0 12183932 492032 ?     Ssl   2025 7281:20 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  3.0  1.6 11952124 263808 ?     Ssl   2025 4970:19 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.4  0.7 22311424 125856 ?     Ssl   2025 308:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1101056 65944 ?       Ssl   2025 244:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1100548 67120 ?       Ssl   2025 243:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1101032 65736 ?       Ssl   2025 245:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100292 64884 ?       Ssl   2025 244:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100672 66196 ?       Ssl   2025 243:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1100392 64624 ?       Ssl   2025 240:12 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100384 63740 ?       Ssl   2025 239:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.8  0.7 11708552 122520 ?     Ssl   2025 579:24 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1100280 64724 ?       Ssl   2025 243:07 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2509059  0.6  0.5 11796320 83560 ?      Ssl  Feb14   6:56 node /home/sasa/miko/miko-hr/server/index.js
sasa     2552495  0.3  0.4 1102172 66860 ?       Ssl  03:02   1:49 node /home/sasa/dex8/dex8-worker/starter.js
www-data 2592891  0.0  0.0   2608   592 ?        S    12:00   0:00 sh -c ps -aux | grep node
www-data 2592893  0.0  0.0   3304   648 ?        S    12:00   0:00 grep node
sasa     2628167  0.9  0.8 1175364 131628 ?      Ssl   2025 1340:10 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11828540 104924 ?     Ssl   2025 956:14 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 85000 ?      Ssl   2025 758:09 node /home/sasa/@mikosoft/dodo-examples/server/index.js