2013年2月20日水曜日

Inside KyoroStress -1- Create Low Memory Killer situation on purpose!!

 Android PF have kill alive process when heigher priority process need heap. 
 This report  explain that produce Low Memory Killer situation on purpose

 You think it so simple. just to make application to consume many heap.
 but, it difficult that your thinking way.
 following problem
  - A. Android PF restrict application java heap per one process.
  - B. heap comsuming application is killed by Android PF.
  
 This report introduce KyoroStress 's solution.

[KyoroStress solution]
  Kyoro Stress done following approach.
    - 1. Booting many service in the process of differing respectively.
    - 2. Each Service consumes a lot of heaps. 

  The problem of A is solved by booting many process, and B too,
  alive heap is more consume instead of kill service's heap 


[BigEater(consuming heap service) 's senario]
  - 1. consume the specified heap.
     if retry is true, then consuming heap is repeated repeatedly until the specified heap is consumed
  - 2. recovery killed service
     if retry is true, then repeated repeatedly until killing this working thread.
  - 3. END

 you think. if ALL Service is killed by PF, when this senario is failed.
 but no problem. PF revcovery Killed service.
 so, keeping to consuming heap situation.

[KyoroStressV2 's manual]

  # start 
   start consuming heap.
  # stop
   stop consuming heap. and release.
  # num of big eater
   booting process num.
  # eatup java heap size
   consuming heap size per one process.
  # is retry
   retry option
  # show notification
   if true, consume notification.
 # lowMoemory
   if true, mean low memory state
  # availMemory
   available memory,
  # threshold
   boundary low memory state.
  # dalvik.vm.heapsize 
   if android:largeHeap="true" 's application available heap size.
  # dalvik.vm.heapgrowthlimit
   if android:largeHeap="false" 's application available heap size.
  # lahalito
   now consuming java heap
  # kadorto
   now recovery another killed process.
  # done all task
  all task is end.

[Output]
  There is apk and source is following site 
   https://github.com/kyorohiro/KyoroStressV2
  Google Play address is following 
   https://play.google.com/store/apps/details?id=info.kyorohiro.helloworld.stressv2

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