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        1208  0.3  0.4 1309184 74892 ?       Ssl   2025 1530:19 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11823300 100956 ?     Ssl   2025 2416:28 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1305956 72340 ?       Ssl   2025 1549:15 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1301776 69648 ?       Ssl   2025 1525:56 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.2  3.7 12343252 613400 ?     Ssl   2025 19571:13 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  7.4  3.7 12280196 615140 ?     Ssl   2025 33953:55 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data  243474  0.0  0.0   2608   596 ?        S    22:30   0:00 sh -c ps -aux | grep node
www-data  243476  0.0  0.0   3304   656 ?        S    22:30   0:00 grep node
sasa     1214480  0.3  0.7 22311168 123616 ?     Ssl   2025 1325:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101568 64740 ?       Ssl   2025 1215:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.3 1101316 65328 ?       Ssl   2025 1214:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1102824 65348 ?       Ssl   2025 1224:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1102340 64564 ?       Ssl   2025 1217:56 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1102208 66064 ?       Ssl   2025 1213:40 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1165928 63624 ?       Ssl   2025 1205:09 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100128 62788 ?       Ssl   2025 1199:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.8  0.7 11847748 125784 ?     Ssl   2025 3199:02 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1103352 66120 ?       Ssl   2025 1214:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.7 11826268 123956 ?     Ssl  Apr20 1778:21 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1631573  0.4  0.4 1303172 81228 ?       Ssl  May31 710:10 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa     1824679  0.4  0.5 11798592 82732 ?      Ssl  Aug15 152:11 node /home/sasa/kriptus/kriptus-panel/server/index.js
sasa     2448036  1.2  0.9 11884812 155780 ?     Ssl  Aug21 312:28 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.7  0.7 1175004 130740 ?      Ssl   2025 3501:14 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     2663246  2.6  0.8 11850956 133176 ?     Ssl  Aug23 580:20 node /home/sasa/kriptus/kriptus-api/starter.js
sasa     3168557  0.6  0.6 11829892 105728 ?     Ssl   2025 2702:38 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799488 83020 ?      Ssl   2025 2224:36 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1333632 86344 ?       Ssl  Feb21 1983:00 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa     3358795  0.6  0.5 1266392 87024 ?       Ssl  Aug29  81:39 node /home/sasa/miko/miko-hr/api/starter.js
sasa     3809381  0.3  0.5 11801124 89192 ?      Ssl  Sep02  27:31 node /home/sasa/dex8/dex8-worker/starter.js