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        1197  1.6  0.6 1325404 99112 ?       Ssl  Oct18 206:06 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1211 10.8  0.6 11708472 113084 ?     Ssl  Oct18 1345:12 node /home/sasa/dex8/dex8-api/starter.js
sasa        1218  0.4  0.5 11800816 85220 ?      Ssl  Oct18  54:06 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1219  0.7  0.6 11809336 99912 ?      Ssl  Oct18  92:33 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1232  0.4  0.5 11805468 90144 ?      Ssl  Oct18  53:33 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1248  0.6  0.5 1332152 84380 ?       Ssl  Oct18  78:31 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1274  0.3  0.4 1301812 67104 ?       Ssl  Oct18  38:46 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1277  0.3  0.3 1297888 64360 ?       Ssl  Oct18  37:56 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1335  0.4  0.7 11849728 126444 ?     Ssl  Oct18  54:27 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1337  0.6  0.6 1159612 113164 ?      Ssl  Oct18  79:52 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1385  2.8  2.6 12146604 430340 ?     Ssl  Oct18 357:33 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1387  0.3  0.4 11797312 81548 ?      Ssl  Oct18  40:49 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1457  0.3  0.4 1101664 65764 ?       Ssl  Oct18  38:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1458  0.3  0.4 22278572 78752 ?      Ssl  Oct18  38:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1514  0.3  0.4 1102052 66300 ?       Ssl  Oct18  38:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1515  0.3  0.4 1101924 65912 ?       Ssl  Oct18  38:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1593  0.3  0.4 1101664 65944 ?       Ssl  Oct18  38:44 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1595  0.3  0.4 1101920 66184 ?       Ssl  Oct18  38:40 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1660  0.3  0.4 1101808 66368 ?       Ssl  Oct18  38:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1661  0.3  0.4 1101664 65792 ?       Ssl  Oct18  38:34 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1732  0.3  0.4 1101664 66568 ?       Ssl  Oct18  38:34 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1734  0.3  0.4 1101664 66180 ?       Ssl  Oct18  38:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1792  0.4  0.5 11809400 91020 ?      Ssl  Oct18  55:31 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      367378  0.5  0.5 1329864 83020 ?       Ssl  Oct21  45:38 node /home/sasa/miko/miko-hr/api/starter.js
sasa      367471  1.0  1.1 11917480 188048 ?     Ssl  Oct21  84:16 node /home/sasa/miko/miko-hr/server/index.js
www-data  987344  0.0  0.0   2608   592 ?        S    02:40   0:00 sh -c ps -aux | grep node
www-data  987346  0.0  0.0   3304   652 ?        S    02:40   0:00 grep node