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 1311744 75812 ?       Ssl   2025 1468:17 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11823044 100216 ?     Ssl   2025 2318:23 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1306980 73296 ?       Ssl   2025 1486:05 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1301520 69644 ?       Ssl   2025 1464:08 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.2  3.7 12330796 609624 ?     Rsl   2025 18732:01 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  7.1  3.7 12274812 609568 ?     Ssl   2025 31320:35 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 124544 ?     Ssl   2025 1257:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101568 65288 ?       Ssl   2025 1150:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1100804 67056 ?       Ssl   2025 1148:30 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1102568 66472 ?       Ssl   2025 1157:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1102340 65460 ?       Ssl   2025 1151:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1102208 66672 ?       Ssl   2025 1147:49 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1166440 64308 ?       Ssl   2025 1139:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1099872 64172 ?       Ssl   2025 1133:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.8  0.7 11845564 122120 ?     Ssl   2025 2851:43 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1101560 65148 ?       Ssl   2025 1148:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.7 11849052 122360 ?     Ssl  Apr20 1565:32 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1631573  0.4  0.6 1322256 100092 ?      Ssl  May31 595:30 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa     1824679  0.4  0.5 11798848 82804 ?      Ssl  Aug15  59:22 node /home/sasa/kriptus/kriptus-panel/server/index.js
sasa     2448036  1.2  0.8 11854252 147232 ?     Ssl  Aug21  57:20 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.7  0.7 1178588 130844 ?      Ssl   2025 3350:43 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     2663246  2.9  0.7 11848740 122860 ?     Ssl  Aug23  55:52 node /home/sasa/kriptus/kriptus-api/starter.js
sasa     2733986  0.3  0.4 1101664 66376 ?       Ssl  04:02   3:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2792279  0.5  0.4 1261688 80056 ?       Ssl  16:36   1:45 node /home/sasa/miko/miko-hr/api/starter.js
www-data 2816961  0.0  0.0   2608   528 ?        S    22:12   0:00 sh -c ps -aux | grep node
www-data 2816963  0.0  0.0   3304   724 ?        S    22:12   0:00 grep node
sasa     3168557  0.6  0.6 11848868 112112 ?     Ssl   2025 2587:03 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799488 83492 ?      Ssl   2025 2124:27 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1332936 85748 ?       Ssl  Feb21 1846:22 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js