Hundreds of RxCachedThreadS

Hi thank you very much for this amazing project. Our product is using this framework and we have delivered into the market with great success.

However we have observed considerable amount of Exception among our users.

OutOfMemoryError: pthread_create (1040KB stack) failed: Try again

On some of our test devices, we found that we get 200+ RxCachedThreadS. listed as following

android_device:/ $ ps -t 26731 |grep RxCachedThread| wc -l                                                                                                                                                  
201

My opinion is those cached threads is way too much. I found a relevant article here. I’ve made sure every Observable.create calls the onComplete method. But the issue persists.

Can you please provide some suggestions which orientation shall we look into?

We are using RxJava:2.1.8 and RxAndroid:2.0.1

[changxiangzhong]

"RxCachedThreadScheduler-8" daemon prio=5 tid=64 Waiting
  | group="main" sCount=1 dsCount=0 obj=0x159c59d0 self=0x89e61100
  | sysTid=7765 nice=0 cgrp=default sched=0/0 handle=0x7dcfa920
  | state=S schedstat=( 0 0 0 ) utm=1 stm=0 core=1 HZ=100
  | stack=0x7dbf8000-0x7dbfa000 stackSize=1038KB
  | held mutexes=
  at java.lang.Object.wait!(Native method)
  - waiting on <0x0cb0e8e6> (a java.lang.Object)
  at java.lang.Thread.parkFor$(Thread.java:2127)
  - locked <0x0cb0e8e6> (a java.lang.Object)
  at sun.misc.Unsafe.park(Unsafe.java:325)
  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:161)
  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2035)
  at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1091)
  at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1084)
  at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1058)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1118)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
  at java.lang.Thread.run(Thread.java:761)

It seems like a thread is wait() for another thread to notify() forever.

Is there options to print all the observeOn and subscrieOn threads?

[daixj]

Thank you @akarnokd. It’s really helpful

how to solve this question?