I wanted to get a customized

Question

I wanted to get a customized with custom number of threads is it ok and wise to use ExperimentalCoroutineDispatcher blocking nThreads < gildor>

withoutclass · Answer

Just create a fixed thread pool and then use it as as displatcher

withoutclass · Answer

`Executors newFixedThreadPool 5 toCoroutineDispatcher ` IIRC

coder82 · Answer

but that is not optimized for IO isn t it

withoutclass · Answer

The IO dispatcher is just a shared pool of threads that get spin up on demand it shares it s threads with the default dispatcher So if you just want a pool of some small number of threads to do work on the example I posted would be fine

withoutclass · Answer

The downside would be that I don t think the fixed thread pool would shutdown spin up threads on demand but I could be wrong

louiscad · Answer

You can also configure the upper limit of `<http Dispatchers IO|Dispatchers IO>` which defaults to 64 it s documented

coder82 · Answer

yes I saw that but I wanted to create a parametrized factory to do it so didn t want to deal with properties

withoutclass · Answer

Problem with the configuration is it would effect all uses of default IO dispatcher but maybe not a problem for this case

coder82 · Answer

as well

coder82 · Answer

do you have an idea on how to know how many elements are in a channel at any given moment I tried count but it consumes them

coder82 · Answer

in order to count them I might have to just consume them and push them back in

withoutclass · Answer

yea it always pulls them all when you count

withoutclass · Answer

if you need to know how many there are channels may not be what you want

coder82 · Answer

uhm right why not using a deque for example

coder82 · Answer

i just wanted to know if it s full or not to assess how loaded is the worker pool pulling messages from the channel

coder82 · Answer

so i need a concurrent data structure

coder82 · Answer

but maybe there is another way to do what i want to do

coder82 · Answer

basically i want to measure how busy is a worker pool

coder82 · Answer

uhm maybe i could use an atomic counter

coder82 · Answer

when i submit the operation to the pool

coder82 · Answer

measuring how full the channel is doesn t anyway tell me much other than at least 1 thread free or all busy

Dico · Answer

You can use a limiting dispatcher This is internal coroutines api You need to cast either default or io dispatcher I dont remember ` <http Dispatchers IO|Dispatchers IO> as SomeInternalDispatcherType limitingDispatcher n `

Dico · Answer

I think default dispatcher is just limiting dispatcher from Io but not certain been some time since I looked at it

gildor · Answer

gt I wanted to get a customized <http Dispatchers IO|Dispatchers IO> with custom number of threads is it ok and wise to use It really depends on your case