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 1303668 80828 ?       Ssl  Oct24 281:05 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.9  0.8 11725168 139860 ?     Ssl  Oct24 495:02 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1304140 72924 ?       Ssl  Oct24 232:32 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.3  0.4 1304912 73544 ?       Ssl  Oct24 201:39 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.6 11824120 112352 ?     Ssl  Oct24 485:17 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.5 11812876 98280 ?      Ssl  Oct24 309:04 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.7  0.5 1330860 83688 ?       Ssl  Oct24 415:09 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1301028 69620 ?       Ssl  Oct24 204:58 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297724 67160 ?       Ssl  Oct24 202:09 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.1  2.6 12138356 441480 ?     Ssl  Oct24 1731:13 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.3  0.3 1166824 64324 ?       Ssl  Oct24 211:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.7  2.9 33134520 478312 ?     Ssl  Oct24 951:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.3  0.3 1101412 65512 ?       Ssl  Oct24 211:38 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.3  0.4 1102180 66492 ?       Ssl  Oct24 211:41 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1101924 65324 ?       Ssl  Oct24 211:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.3  0.4 1102696 67252 ?       Ssl  Oct24 211:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.3  0.4 1102948 66524 ?       Ssl  Oct24 210:53 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.3  0.4 1168480 67168 ?       Ssl  Oct24 211:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.3  0.3 1101408 64588 ?       Ssl  Oct24 206:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.3  0.3 1100136 64660 ?       Ssl  Oct24 208:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.6  0.9 11857232 159432 ?     Ssl  Oct24 922:06 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     2628167  0.8  0.7 1170996 127664 ?      Ssl  Nov04 317:05 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11801036 90748 ?      Ssl  Nov06 226:04 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.4  0.5 11798664 83844 ?      Ssl  Nov06 147:59 node /home/sasa/@mikosoft/dodo-examples/server/index.js
www-data 4165964  0.0  0.0   2608   592 ?        S    07:29   0:00 sh -c ps -aux | grep node
www-data 4165966  0.0  0.0   3304   648 ?        S    07:29   0:00 grep node