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         914  0.5  0.5 1307544 85768 ?       Ssl  Aug04 316:11 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa         935  0.7  0.8 11786840 132404 ?     Ssl  Aug04 467:30 node /home/sasa/dex8/dex8-api/starter.js
sasa         938  0.4  0.4 1307036 76464 ?       Ssl  Aug04 266:37 node /home/sasa/regoch/regoch-www/server
sasa         945  0.3  0.4 1303752 70980 ?       Ssl  Aug04 228:44 node /home/sasa/dex8/dex8-panel/server/index.js
sasa         947  0.7  0.7 11853768 116676 ?     Ssl  Aug04 467:56 node /home/sasa/dex8/dex8-www/server/index.js
sasa         966  0.5  0.5 11808976 97724 ?      Ssl  Aug04 351:58 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         980  0.7  0.5 1330216 83088 ?       Ssl  Aug04 480:21 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         997  0.3  0.4 1303104 71576 ?       Ssl  Aug04 231:02 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1021  0.3  0.4 1297920 66128 ?       Ssl  Aug04 227:48 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1065  0.6  0.6 11825000 100048 ?     Ssl  Aug04 388:54 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1074  0.6  0.6 1149316 103688 ?      Ssl  Aug04 378:29 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1136  0.7  0.9 11861572 157324 ?     Ssl  Aug04 440:29 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1148  0.4  0.4 11794644 78220 ?      Ssl  Aug04 252:07 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1197  0.3  0.4 1102188 66128 ?       Ssl  Aug04 235:28 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1199  0.3  0.4 22277756 77388 ?      Ssl  Aug04 238:57 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1308  0.3  0.3 1101664 65280 ?       Ssl  Aug04 234:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1325  0.3  0.3 1101408 65492 ?       Ssl  Aug04 234:40 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1393  0.7  0.8 22324196 143788 ?     Ssl  Aug04 481:39 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1395  0.3  0.3 1101676 65512 ?       Ssl  Aug04 235:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1489  0.3  0.3 1101408 64724 ?       Ssl  Aug04 235:42 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1496  0.3  0.4 1102432 67268 ?       Ssl  Aug04 234:28 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1101408 65268 ?       Ssl  Aug04 235:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1608  0.3  0.3 1101920 65244 ?       Ssl  Aug04 233:53 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1686  1.1  0.9 11847744 148728 ?     Ssl  Aug04 699:24 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data  643350  0.0  0.0   2608   592 ?        S    00:26   0:00 sh -c ps -aux | grep node
www-data  643352  0.0  0.0   3304   720 ?        S    00:26   0:00 grep node
sasa     1371685  0.4  0.5 11803816 90656 ?      Ssl  Aug16 189:09 node /home/sasa/mikosoft-info/solar-wind-energy/server/index.js
sasa     1460918  0.4  0.3 1300136 65248 ?       Ssl  Aug17 186:51 node /home/sasa/sites-nodejs/oxygen-free-copper/server.js