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         831  0.5  0.4 1304136 77976 ?       Ssl  Jun15 199:38 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa         843  0.5  0.7 11710276 124076 ?     Ssl  Jun15 215:56 node /home/sasa/dex8/dex8-api/starter.js
sasa         858  0.3  0.4 1306304 73964 ?       Ssl  Jun15 155:39 node /home/sasa/regoch/regoch-www/server
sasa         867  0.3  0.4 1301192 70800 ?       Ssl  Jun15 144:00 node /home/sasa/dex8/dex8-panel/server/index.js
sasa         886  0.7  0.5 11802224 94220 ?      Ssl  Jun15 309:39 node /home/sasa/dex8/dex8-www/server/index.js
sasa         888  0.5  0.4 11793740 80268 ?      Ssl  Jun15 213:11 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         904  0.7  0.5 1329652 82088 ?       Ssl  Jun15 287:14 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         910  0.3  0.4 1302288 69192 ?       Ssl  Jun15 144:49 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa         969  0.3  0.4 1298376 65672 ?       Ssl  Jun15 143:19 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa         970  0.6  0.5 11811240 94904 ?      Ssl  Jun15 259:42 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1010  0.6  0.6 1148612 104424 ?      Ssl  Jun15 242:40 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1016  0.7  1.1 11893332 188224 ?     Ssl  Jun15 308:35 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1086  0.3  0.4 11794912 78184 ?      Ssl  Jun15 156:51 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1089  0.3  0.3 1099868 64268 ?       Ssl  Jun15 147:03 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1159  0.3  0.4 22277948 77872 ?      Ssl  Jun15 150:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1160  0.3  0.3 1099356 63000 ?       Ssl  Jun15 147:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1241  0.3  0.3 1101208 63176 ?       Ssl  Jun15 147:42 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1242  0.4  0.7 22306672 115424 ?     Ssl  Jun15 169:41 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1323  0.3  0.3 1099612 63108 ?       Ssl  Jun15 147:22 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1324  0.3  0.3 1100384 64556 ?       Ssl  Jun15 147:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1398  0.3  0.3 1098592 63156 ?       Ssl  Jun15 147:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1400  0.3  0.3 1100124 63096 ?       Ssl  Jun15 147:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1465  0.3  0.3 1099872 62928 ?       Ssl  Jun15 146:57 node /home/sasa/dex8/dex8-worker/starter.js
sasa      178968  0.8  0.7 11825016 122576 ?     Ssl  Jun17 300:57 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1802958  0.8  0.5 1316784 92420 ?       Ssl  Jul09  31:05 node /home/sasa/crypto/dex-arbitrage-bot/scripts/observer/index-
www-data 2069569  0.0  0.0   2608   536 ?        S    10:31   0:00 sh -c ps -aux | grep node
www-data 2069571  0.0  0.0   3304   660 ?        S    10:31   0:00 grep node