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  0.2 1308832 48000 ?       Ssl   2025 1656:44 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.4 11822896 73512 ?      Ssl   2025 2615:52 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.2 1306008 45480 ?       Ssl   2025 1677:03 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.2 1301856 43256 ?       Ssl   2025 1651:24 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.2  3.3 12268756 547704 ?     Ssl   2025 21184:37 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  8.0  4.2 12371700 694244 ?     Ssl   2025 39934:51 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.5 22311168 91724 ?      Ssl   2025 1465:22 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.2 1101824 35024 ?       Ssl   2025 1349:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.2 1101060 34972 ?       Ssl   2025 1347:42 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.2 1102312 35592 ?       Ssl   2025 1358:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.2 1103364 35980 ?       Ssl   2025 1352:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.2 1102208 36292 ?       Ssl   2025 1347:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.2 1166440 33752 ?       Ssl   2025 1338:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.2 1100640 34088 ?       Ssl   2025 1332:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1216489  0.3  0.2 1101560 34640 ?       Ssl   2025 1348:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.6 11827940 104844 ?     Ssl  Apr20 2114:51 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1631573  0.6  0.3 1303176 58280 ?       Ssl  May31 1125:47 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa     1824679  0.4  0.3 11799104 55940 ?      Ssl  Aug15 342:05 node /home/sasa/kriptus/kriptus-panel/server/index.js
sasa     2072475  0.7  0.5 1160308 92912 ?       Ssl  Sep24 119:57 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     2075109 11.4  0.5 11709484 93868 ?      Ssl  Sep24 1843:04 node /home/sasa/dex8/dex8-api/starter.js
sasa     2075416  0.6  0.3 1330872 59096 ?       Ssl  Sep24 104:50 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa     2448036  1.2  0.9 11897852 148664 ?     Ssl  Aug21 807:28 node /home/sasa/miko/miko-hr/server/index.js
sasa     2663246  2.2  0.6 11847968 107668 ?     Ssl  Aug23 1405:05 node /home/sasa/kriptus/kriptus-api/starter.js
sasa     3168557  0.6  0.4 11812308 80472 ?      Ssl   2025 2964:06 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.3 11799488 54928 ?      Ssl   2025 2428:27 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3358795  0.6  0.3 1267292 61704 ?       Ssl  Aug29 351:10 node /home/sasa/miko/miko-hr/api/starter.js
www-data 3428884  0.0  0.0   2608   596 ?        S    01:01   0:00 sh -c ps -aux | grep node
www-data 3428886  0.0  0.0   3304   704 ?        S    01:01   0:00 grep node
sasa     3809381  0.3  0.4 22300360 80800 ?      Ssl  Sep02 170:59 node /home/sasa/dex8/dex8-worker/starter.js