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  1.3  0.5 1325708 97036 ?       Ssl  Oct18 308:55 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1211  8.5  0.7 11710212 115824 ?     Ssl  Oct18 1923:25 node /home/sasa/dex8/dex8-api/starter.js
sasa        1218  0.4  0.5 11801072 84416 ?      Ssl  Oct18  99:22 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1219  0.7  0.6 11816524 100624 ?     Ssl  Oct18 172:47 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1232  0.4  0.5 11807164 89660 ?      Ssl  Oct18 102:10 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1248  0.6  0.5 1347768 85340 ?       Ssl  Oct18 144:19 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1274  0.3  0.4 1300948 68248 ?       Ssl  Oct18  70:16 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1277  0.3  0.3 1298272 64380 ?       Ssl  Oct18  69:03 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1335  0.4  0.7 11848672 124960 ?     Ssl  Oct18 101:18 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1337  0.6  0.7 1163528 115984 ?      Ssl  Oct18 153:21 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1385  3.6  3.8 12341288 628784 ?     Ssl  Oct18 828:35 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1387  0.3  0.4 11797452 81020 ?      Ssl  Oct18  75:34 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1457  0.3  0.3 1099104 61072 ?       Ssl  Oct18  70:30 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1458  0.3  0.4 22280364 79504 ?      Ssl  Oct18  71:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1514  0.3  0.3 1099492 62552 ?       Ssl  Oct18  70:12 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1515  0.3  0.3 1099364 63328 ?       Ssl  Oct18  70:05 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1593  0.3  0.3 1099360 63584 ?       Ssl  Oct18  70:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1595  0.3  0.3 1098848 62936 ?       Ssl  Oct18  70:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1660  0.3  0.3 1098992 62264 ?       Ssl  Oct18  70:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1661  0.3  0.4 1102688 66808 ?       Ssl  Oct18  70:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1732  0.3  0.4 1102688 66876 ?       Ssl  Oct18  70:12 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1734  0.3  0.3 1099104 62540 ?       Ssl  Oct18  69:59 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1792  0.4  0.5 11813724 95744 ?      Ssl  Oct18 108:12 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      367378  0.6  0.5 1331052 84444 ?       Ssl  Oct21 113:24 node /home/sasa/miko/miko-hr/api/starter.js
sasa      367471  1.2  1.0 11869000 169012 ?     Ssl  Oct21 219:04 node /home/sasa/miko/miko-hr/server/index.js
www-data 1720541  0.0  0.0   2608   536 ?        S    02:53   0:00 sh -c ps -aux | grep node
www-data 1720543  0.0  0.0   3304   724 ?        S    02:53   0:00 grep node