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  1.2  0.6 1325980 101808 ?      Ssl  Oct18 398:59 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1211  7.2  0.7 11845376 119888 ?     Ssl  Oct18 2358:29 node /home/sasa/dex8/dex8-api/starter.js
sasa        1218  0.4  0.5 11801072 83236 ?      Ssl  Oct18 145:51 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1219  0.7  0.5 11806708 95856 ?      Ssl  Oct18 259:36 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1232  0.4  0.5 11808700 91212 ?      Ssl  Oct18 152:00 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1248  0.6  0.5 1333176 84968 ?       Ssl  Oct18 210:49 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1274  0.3  0.4 1311620 72108 ?       Ssl  Oct18 102:53 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1277  0.3  0.3 1294096 61288 ?       Ssl  Oct18 101:10 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1337  0.6  0.7 1165304 116920 ?      Ssl  Oct18 224:24 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1385  3.8  4.3 12410708 720236 ?     Ssl  Oct18 1260:44 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1387  0.3  0.4 11797708 80664 ?      Ssl  Oct18 112:38 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1457  0.3  0.3 1099104 61860 ?       Ssl  Oct18 102:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1458  0.3  0.4 22278316 78208 ?      Ssl  Oct18 105:03 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1514  0.3  0.3 1099748 62908 ?       Ssl  Oct18 102:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1515  0.3  0.3 1099364 62748 ?       Ssl  Oct18 102:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1593  0.3  0.3 1099360 62816 ?       Ssl  Oct18 102:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1595  0.3  0.3 1099104 62980 ?       Ssl  Oct18 102:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1660  0.3  0.3 1099248 63304 ?       Ssl  Oct18 102:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1661  0.3  0.3 1099360 63096 ?       Ssl  Oct18 102:28 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1732  0.3  0.3 1099104 62592 ?       Ssl  Oct18 102:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1734  0.3  0.3 1099360 63272 ?       Ssl  Oct18 102:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1792  1.8  3.8 12348508 638184 ?     Ssl  Oct18 589:06 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      367378  0.6  0.5 1331052 84316 ?       Ssl  Oct21 182:05 node /home/sasa/miko/miko-hr/api/starter.js
sasa      367471  1.1  1.0 11869512 169776 ?     Ssl  Oct21 328:57 node /home/sasa/miko/miko-hr/server/index.js
sasa     2446447  0.4  0.6 11838720 112240 ?     Ssl  Nov09   1:52 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
www-data 2477194  0.0  0.0   2608   588 ?        S    02:20   0:00 sh -c ps -aux | grep node
www-data 2477196  0.0  0.0   3304   656 ?        S    02:20   0:00 grep node