dart - Improve application performance with isolate -

i have application generate hashed password , generate takes time. think improve performance, let hashed password generator work in seperate core. computer support 3 core processors , think idea use dart:isolate calculate hashed password in other processor core.

i have tried following:

import 'dart:isolate'; import 'package:dbcrypt/dbcrypt.dart';  main() {    receiveport receiveport = new receiveport();   var receiveportpw = new receiveport();    receiveportpw.listen((msg) {      print(msg);    });    isolate.spawn(returnhashedpassword, receiveportpw.sendport);   print('print1 -> ' + new dbcrypt().hashpw('password', new dbcrypt().gensalt()));     print('print2 -> ' + new dbcrypt().hashpw('password', new dbcrypt().gensalt()));    }  void returnhashedpassword(sendport sendport) {     receiveport receiveport = new receiveport();     sendport.send('isolate -> ' + new dbcrypt().hashpw('password', new dbcrypt().gensalt()));     } 

as output have got

print1 -> $2a$10$xgggpuiylp2glon2ektw2.kg5qwk4fkiidfa8hkgdpdy1h1aac6lo print2 -> $2a$10$zk..l6hi0nkerbkm2/v6h.5s25qqsjwrszi83.i3czfzlb7pfcw6g isolate -> $2a$10$dm/.25em/3amvgnu2g6wl.sqq2ecgse6duwpc56tvdomgw9zbja36 

it seems be, not working concurrency. expected, isolate first place or second place not last. wrong here?

your code working concurrently. when add print() isolate's function this:

void returnhashedpassword(sendport sendport) {     print('ok');     receiveport receiveport = new receiveport();     sendport.send('isolate -> ' + new dbcrypt().hashpw('password', new dbcrypt().gensalt()));     print('done'); } 

the output be:

ok done print1 -> $2a$10$p..gsyxybtjmbrhke.xu1.ifeuihbxxpl9dyclhqx72ykhszb0e1e print2 -> $2a$10$ea.2bnvakh6ubfjiwnwua.jdubhgypsmp2pyopsgd84gcx.spaas. isolate -> $2a$10$.sbmleeuv5u.nasgoe6on.kxq7cnq6yj8ixrbgczgx8tgmcbzt7ny 

i guess dart has inbuilt resource allocation algorithm gives stdout processes avoid weird prints.

when change code this:

import 'dart:isolate'; import 'package:dbcrypt/dbcrypt.dart'; import 'dart:async';  main() {    //receiveport receiveport = new receiveport();   var receiveportpw = new receiveport();   receiveportpw.listen((msg) {      print(msg);    });     future<isolate> f = isolate.spawn(returnhashedpassword, receiveportpw.sendport);   f.then((isolate i) {     print('print1 -> ' + new dbcrypt().hashpw('password', new dbcrypt().gensalt()));     print('print2 -> ' + new dbcrypt().hashpw('password', new dbcrypt().gensalt()));   }); }  void returnhashedpassword(sendport sendport) {     print('ok');     receiveport receiveport = new receiveport();     sendport.send('isolate -> ' + new dbcrypt().hashpw('password', new dbcrypt().gensalt()));     print('done'); } 

the output is:

ok print1 -> $2a$10$zabonuhkun.gqerw2euu7.hpznizwtdydbssle0b1xl6o9jeo/4dm done print2 -> $2a$10$se.eczx2i1o2dfey.npsi.gzxhju9kdwpap1utofbjui/ltjppwy2 isolate -> $2a$10$s.b.0dngq0ko1za..i5ul.u1arkluk/jtv/.o8bjp7gqroidvesec 

you can see working concurrent.

regards, robert