when running this (<https://pl.kotl.in/AcLXICVsf>) I would have assumed that doing the context switc...

# coroutines

[Josh Feinberg]

when running this (https://pl.kotl.in/AcLXICVsf) I would have assumed that doing the context switch would make it run slower. however, it seems to have no effect on the runtime. is this a bad test or am i just misunderstanding how these work

[octylFractal]

with the monotonic nanoTime, I'm certainly seeing a small difference: https://pl.kotl.in/FHT6gAZLn

[Marc Knaup]

Switching between .IO and .Default dispatcher is implemented very efficiently and often doesn’t even change the thread.

[Marc Knaup]

see https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-dispatchers/-i-o.html

[Josh Feinberg]

okay, so this is just because i chose those two threads that there isn't a difference?

[Marc Knaup]

likely

[Marc Knaup]

Switching between Main and `Default`/`IO` should look differently.

[Josh Feinberg]

so like if I did .Main for deserializeWithContext (on android) I would see a noticeable difference

[Marc Knaup]

I don’t know though whether it would be “noticeable” 🙂
After all switching context doesn’t mean spinning up a new thread all the time. It merely passes executions between threads and tries to do so as efficiently as possible.