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 1304580 81936 ?       Ssl   2025 997:55 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305000 73532 ?       Ssl   2025 715:20 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.7 11826376 115960 ?     Ssl   2025 1586:13 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11818492 109080 ?     Ssl   2025 1131:42 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304152 72348 ?       Ssl   2025 726:22 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1307472 70860 ?       Ssl   2025 714:10 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.5  2.6 12139132 441768 ?     Ssl   2025 8932:36 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  3.1  1.9 11992532 311544 ?     Ssl   2025 6220:47 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      853162  0.3  0.3 1097056 61492 ?       Ssl  03:03   0:24 node /home/sasa/dex8/dex8-worker/starter.js
www-data  862497  0.0  0.0   2608   596 ?        S    05:03   0:00 sh -c ps -aux | grep node
www-data  862499  0.0  0.0   3304   716 ?        S    05:03   0:00 grep node
sasa     1214480  0.4  0.7 22311424 126200 ?     Ssl   2025 418:43 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101056 65484 ?       Ssl   2025 349:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1100804 66528 ?       Ssl   2025 348:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1100776 64320 ?       Ssl   2025 351:22 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100804 64984 ?       Ssl   2025 349:43 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.3 1100672 65392 ?       Ssl   2025 348:51 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1100136 64268 ?       Ssl   2025 343:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1099360 63176 ?       Ssl   2025 342:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11708808 121956 ?     Ssl   2025 754:01 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1100792 64476 ?       Ssl   2025 348:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2509059  0.6  0.6 11824944 102232 ?     Ssl  Feb14 198:17 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1177432 133144 ?      Ssl   2025 1590:38 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11825324 100440 ?     Ssl   2025 1130:19 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 85024 ?      Ssl   2025 917:07 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1329952 83068 ?       Ssl  Feb21 139:17 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js