Agent use two thread pools to execute actions,send use a fixed thread
pool (2+cpus threads),and send-off use a cached thread pool.These
pools are global in clojure system.
I think the Agent should allow users to customize the thread pool,
if no custom, then use the global thread pool.
Why do I need a custom thread pool?
First, the default thread pool is global, send use the thread pool
is a fixed size cpus +2, is likely to become the system bottleneck
sometime. Although you can use the send-off, use the cache thread
pool, but in a real world application, I can not use the cache thread
pool, which will introduce the risk of OutOfMemoryError, normally I
like to use a fixed-size thread pool.
Second, the actions which global thread pool execute are from a
variety of agents, the actions are not homogeneous, and can not
maximize the efficient use of the thread pool, we hope that you can
specify different agent to isolate a particular thread pool to
maximize the use of thread pool .
I think Agent could add two new functions:
(set-executor! agent (java.util.concurrent.Executors/
newFixedThreadPool 2))
(shutdown-agent agent)
set-executor! is to set the agent's custom thread pool,and shutdown-
agent to shutdown the agent's custom thread pool.
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