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  0.5 1305620 85340 ?       Ssl   2025 1079:47 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305000 72888 ?       Ssl   2025 775:29 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.7  0.7 11850616 115732 ?     Ssl   2025 1711:23 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11820476 104704 ?     Ssl   2025 1227:01 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304920 73316 ?       Ssl   2025 787:07 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1301872 71684 ?       Ssl   2025 774:02 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.5  2.7 12172868 457384 ?     Ssl   2025 9720:53 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  3.3  2.1 12022640 344124 ?     Rsl   2025 7106:49 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.4  0.7 22311424 125744 ?     Ssl   2025 486:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101056 65112 ?       Ssl   2025 414:07 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1100804 66388 ?       Ssl   2025 413:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1100776 65044 ?       Ssl   2025 415:52 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100548 64416 ?       Ssl   2025 414:01 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.3 1100672 65028 ?       Ssl   2025 412:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1101416 65440 ?       Ssl   2025 407:01 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1101408 64508 ?       Ssl   2025 405:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11708808 124992 ?     Ssl   2025 859:43 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1100792 64832 ?       Ssl   2025 412:30 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2295794  0.3  0.3 1098844 63544 ?       Ssl  03:02   2:16 node /home/sasa/dex8/dex8-worker/starter.js
www-data 2359711  0.0  0.0   2608   596 ?        S    14:53   0:00 sh -c ps -aux | grep node
www-data 2359713  0.0  0.0   3304   720 ?        S    14:53   0:00 grep node
sasa     2509059  0.5  0.5 11802444 93732 ?      Ssl  Feb14 304:19 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.7 1175640 129920 ?      Ssl   2025 1730:50 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11800720 90232 ?      Ssl   2025 1237:17 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 84568 ?      Ssl   2025 1013:41 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1330104 83824 ?       Ssl  Feb21 266:56 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js