Is it normal that coroutine takes almost 50ms to run the cod kotlinlang #coroutines

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Title

Maciek

07/21/2020, 2:33 PM

Is it normal that coroutine takes almost 50ms to run the code in the

launch

block? No context switching, same thread. Simple

MainScope().launch {}

. Is there a way to run it sequentially or at least with smaller delays?

sikri

07/21/2020, 2:43 PM

printTime() // 0 secs passed
launch {
  printTime() // 5 secs passed
}
sleep(5)

if you don’t do context switching and, as you said, same thread, it is okay for coroutine to move your code block to the end of the block stack, so it won’t run, until previous block is finished

Maciek

07/21/2020, 5:48 PM

ooh, that makes sense, thanks!

Lukas Lechner

07/29/2020, 2:51 PM

If thats on Android then launching a coroutine on the main thread is like posting a runnable to the message queue of the main thread and this can take some time if it is able to process your runnable. I think there is

Dispatchers.Main.immediate

that executes your launched coroutine immediately.

👍 2

Maciek

07/31/2020, 6:58 PM

awesome, that's what I was looking for, thanks!

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