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 1303236 79688 ?       Ssl  Oct24 275:00 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.9  0.8 11722864 138916 ?     Ssl  Oct24 482:37 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1305676 73992 ?       Ssl  Oct24 226:44 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.3  0.4 1304912 72900 ?       Ssl  Oct24 197:11 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.6 11822116 99960 ?      Ssl  Oct24 474:57 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.5 11813132 97292 ?      Ssl  Oct24 302:01 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.7  0.5 1330860 83704 ?       Ssl  Oct24 404:51 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1301028 69756 ?       Ssl  Oct24 200:24 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297724 67608 ?       Ssl  Oct24 197:38 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.1  2.8 12158260 462432 ?     Ssl  Oct24 1687:37 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.3  0.4 1168360 65812 ?       Ssl  Oct24 207:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.7  2.7 33111048 449256 ?     Ssl  Oct24 920:56 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.3  0.3 1100900 64428 ?       Ssl  Oct24 206:56 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.3  0.3 1100644 64484 ?       Ssl  Oct24 207:00 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.4 1101156 66060 ?       Ssl  Oct24 206:23 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.3  0.4 1101416 65884 ?       Ssl  Oct24 206:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.3  0.3 1101156 65356 ?       Ssl  Oct24 206:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.3  0.4 1166944 66088 ?       Ssl  Oct24 206:28 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.3  0.3 1100128 63880 ?       Ssl  Oct24 202:18 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.3  0.3 1099880 63340 ?       Ssl  Oct24 203:38 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.6  0.9 11859024 162168 ?     Ssl  Oct24 887:51 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     2628167  0.8  0.7 1170728 127364 ?      Ssl  Nov04 306:41 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11800780 90080 ?      Ssl  Nov06 218:18 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.4  0.5 11798408 83192 ?      Ssl  Nov06 142:35 node /home/sasa/@mikosoft/dodo-examples/server/index.js
www-data 3875540  0.0  0.0   2608   528 ?        S    07:21   0:00 sh -c ps -aux | grep node
www-data 3875542  0.0  0.0   3304   660 ?        S    07:21   0:00 grep node