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 1309152 75328 ?       Ssl   2025 1436:49 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11822212 99712 ?      Ssl   2025 2268:55 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1307492 74312 ?       Ssl   2025 1454:31 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1301776 69760 ?       Ssl   2025 1432:56 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.2  3.6 12294028 591852 ?     Ssl   2025 18238:33 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  7.0  3.6 12271392 605460 ?     Ssl   2025 30022:16 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 124356 ?     Ssl   2025 1222:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1103360 67420 ?       Ssl   2025 1116:56 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.3 1101060 65312 ?       Ssl   2025 1115:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1102312 66044 ?       Ssl   2025 1124:23 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.4 1102340 66004 ?       Ssl   2025 1118:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1101952 67084 ?       Ssl   2025 1114:38 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1166440 64364 ?       Ssl   2025 1106:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100128 64452 ?       Ssl   2025 1100:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.8  0.7 11845564 124076 ?     Ssl   2025 2796:20 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1101816 65436 ?       Ssl   2025 1114:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.6 11807324 110512 ?     Ssl  Apr20 1477:32 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1631573  0.4  0.6 1322208 99224 ?       Ssl  May31 551:01 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa     1824679  0.3  0.5 11797568 82956 ?      Ssl  Aug15  12:34 node /home/sasa/kriptus/kriptus-panel/server/index.js
sasa     1835274  2.1  0.7 11845448 124012 ?     Ssl  Aug15  66:17 node /home/sasa/kriptus/kriptus-api/starter.js
sasa     1873432  0.3  0.5 22292164 97472 ?      Ssl  Aug16   8:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1904154  0.7  0.9 11855208 155700 ?     Ssl  Apr25 1161:15 node /home/sasa/miko/miko-hr/server/index.js
www-data 2062087  0.0  0.0   2608   592 ?        S    22:29   0:00 sh -c ps -aux | grep node
www-data 2062089  0.0  0.0   3304   716 ?        S    22:29   0:00 grep node
sasa     2628167  0.7  0.7 1176028 130876 ?      Ssl   2025 3270:31 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11850884 112688 ?     Ssl   2025 2531:46 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799488 83316 ?      Ssl   2025 2073:50 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1333448 86980 ?       Ssl  Feb21 1777:12 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js