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c

coder82

08/15/2019, 7:34 PM
I wanted to get a customized Dispatchers.IO with custom number of threads, is it ok and wise to use ExperimentalCoroutineDispatcher().blocking(nThreads) ? @gildor
w

withoutclass

08/15/2019, 7:38 PM
Just create a fixed thread pool and then use it as as displatcher
Executors.newFixedThreadPool(5).toCoroutineDispatcher()
IIRC
c

coder82

08/15/2019, 7:39 PM
but that is not optimized for IO isn't it?
w

withoutclass

08/15/2019, 7:42 PM
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
1
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
l

louiscad

08/15/2019, 7:43 PM
You can also configure the upper limit of
<http://Dispatchers.IO|Dispatchers.IO>
which defaults to 64, it's documented.
c

coder82

08/15/2019, 7:44 PM
yes I saw that but I wanted to create a parametrized factory to do it so didn't want to deal with properties
w

withoutclass

08/15/2019, 7:45 PM
Problem with the configuration is it would effect all uses of default/IO dispatcher, but maybe not a problem for this case
c

coder82

08/15/2019, 7:45 PM
as well...
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
in order to count them I might have to just consume them and push them back in
w

withoutclass

08/15/2019, 7:54 PM
yea it always pulls them all when you count
if you need to know how many there are channels may not be what you want
c

coder82

08/15/2019, 7:54 PM
uhm, right why not using a deque for example
i just wanted to know if it's full or not to assess how loaded is the worker pool pulling messages from the channel
so i need a concurrent data structure
but maybe there is another way to do what i want to do
basically i want to measure how busy is a worker pool
uhm maybe i could use an atomic counter
:rubber_duck: 3
when i submit the operation to the pool
measuring how full the channel is doesn't anyway tell me much other than "at least 1 thread free" or "all busy"
d

Dico

08/15/2019, 10:04 PM
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)
I think default dispatcher is just limiting dispatcher from Io but not certain, been some time since I looked at it
g

gildor

08/16/2019, 6:29 AM
I wanted to get a customized Dispatchers.IO with custom number of threads, is it ok and wise to use
It really depends on your case