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  0.4 1304076 81592 ?       Ssl  Oct24 163:35 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  1.0  0.8 11722936 139288 ?     Ssl  Oct24 286:09 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1304652 72852 ?       Ssl  Oct24 127:47 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.4  0.4 1304400 72692 ?       Ssl  Oct24 117:00 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  1.0  0.6 11826120 102580 ?     Ssl  Oct24 295:29 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.5 11812364 96804 ?      Ssl  Oct24 176:01 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.8  0.5 1329104 82124 ?       Ssl  Oct24 228:00 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.4  0.4 1300948 70764 ?       Ssl  Oct24 118:40 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.4  0.3 1296912 64984 ?       Ssl  Oct24 117:10 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  2.8  2.6 12137332 437284 ?     Ssl  Oct24 819:22 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.4  0.3 1165544 63540 ?       Ssl  Oct24 123:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.8  2.6 22632440 442044 ?     Ssl  Oct24 532:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.4  0.3 1101412 65108 ?       Ssl  Oct24 122:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.4  0.3 1101412 65376 ?       Ssl  Oct24 123:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.4  0.4 1101412 65808 ?       Ssl  Oct24 122:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.4  0.4 1101672 66500 ?       Ssl  Oct24 122:18 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.4  0.4 1101668 66820 ?       Ssl  Oct24 122:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.4  0.4 1101408 65580 ?       Ssl  Oct24 122:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.4  0.3 1099872 64100 ?       Ssl  Oct24 120:00 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.4  0.3 1099112 63220 ?       Ssl  Oct24 120:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.4  0.8 11837068 136836 ?     Ssl  Oct24 399:50 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data   59498  0.0  0.0   2608   528 ?        S    06:07   0:00 sh -c ps -aux | grep node
www-data   59500  0.0  0.0   3304   660 ?        S    06:07   0:00 grep node
sasa     2628167  0.9  0.6 1157440 112532 ?      Ssl  Nov04 119:15 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.7  0.5 11813796 96628 ?      Ssl  Nov06  72:28 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11797896 82376 ?      Ssl  Nov06  50:12 node /home/sasa/@mikosoft/dodo-examples/server/index.js