/* 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. */
$ps -aux | grep node (list all node processes) sasa 914 0.5 0.5 1306672 84160 ? Ssl Aug04 312:16 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr sasa 935 0.7 0.8 11786840 133228 ? Ssl Aug04 462:38 node /home/sasa/dex8/dex8-api/starter.js sasa 938 0.4 0.4 1307036 76424 ? Ssl Aug04 263:05 node /home/sasa/regoch/regoch-www/server sasa 945 0.3 0.4 1303752 71096 ? Ssl Aug04 225:57 node /home/sasa/dex8/dex8-panel/server/index.js sasa 947 0.7 0.6 11818788 105480 ? Ssl Aug04 462:11 node /home/sasa/dex8/dex8-www/server/index.js sasa 966 0.5 0.5 11808976 97060 ? Ssl Aug04 347:32 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js sasa 980 0.7 0.5 1330216 82944 ? Ssl Aug04 473:42 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js sasa 997 0.3 0.4 1303104 72672 ? Ssl Aug04 228:13 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js sasa 1021 0.3 0.3 1297920 65248 ? Ssl Aug04 225:01 node /home/sasa/dex8/dex8-kiosk/server/index.js sasa 1065 0.6 0.5 11812960 97464 ? Ssl Aug04 382:20 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js sasa 1074 0.6 0.6 1149316 103772 ? Ssl Aug04 373:45 node /home/sasa/voovuu/voovuu-api/starter.js sasa 1136 0.7 0.9 11859876 160428 ? Rsl Aug04 435:17 node /home/sasa/voovuu/voovuu-pub/server/index.js sasa 1148 0.4 0.4 11794644 77988 ? Ssl Aug04 248:57 node /home/sasa/@mikosoft/dodo-examples/server/index.js sasa 1197 0.3 0.3 1099884 63292 ? Ssl Aug04 232:35 node /home/sasa/dex8/dex8-worker/starter.js sasa 1199 0.3 0.4 22277756 77536 ? Ssl Aug04 235:55 node /home/sasa/dex8/dex8-worker/starter.js sasa 1308 0.3 0.3 1099616 63816 ? Ssl Aug04 231:53 node /home/sasa/dex8/dex8-worker/starter.js sasa 1325 0.3 0.3 1099360 63060 ? Ssl Aug04 231:44 node /home/sasa/dex8/dex8-worker/starter.js sasa 1393 0.7 0.8 22326244 145728 ? Ssl Aug04 478:19 node /home/sasa/dex8/dex8-worker/starter.js sasa 1395 0.3 0.3 1099884 63264 ? Ssl Aug04 232:51 node /home/sasa/dex8/dex8-worker/starter.js sasa 1489 0.3 0.3 1100128 63208 ? Ssl Aug04 232:47 node /home/sasa/dex8/dex8-worker/starter.js sasa 1496 0.3 0.3 1100384 64776 ? Ssl Aug04 231:34 node /home/sasa/dex8/dex8-worker/starter.js sasa 1607 0.3 0.3 1099872 63500 ? Ssl Aug04 232:07 node /home/sasa/dex8/dex8-worker/starter.js sasa 1608 0.3 0.3 1099872 63636 ? Ssl Aug04 231:00 node /home/sasa/dex8/dex8-worker/starter.js sasa 1686 1.1 0.8 11846976 147404 ? Ssl Aug04 684:31 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index. www-data 616512 0.0 0.0 2608 596 ? S 17:03 0:00 sh -c ps -aux | grep node www-data 616514 0.0 0.0 3304 716 ? S 17:03 0:00 grep node sasa 1371685 0.4 0.5 11803816 90028 ? Ssl Aug16 186:04 node /home/sasa/mikosoft-info/solar-wind-energy/server/index.js sasa 1460918 0.4 0.3 1300136 64684 ? Ssl Aug17 183:42 node /home/sasa/sites-nodejs/oxygen-free-copper/server.js