[GitHub] spark issue #19135: [SPARK-21923][CORE]Avoid call reserveUnrollMemoryForThis...

[ConeyLiu]

Github user ConeyLiu commented on the issue:

    https://github.com/apache/spark/pull/19135
  
    @jiangxb1987 Ok, I can test it later. The following picture is when I run 
kmeans and put the source data into the offheap memory, and you can see the CPU 
time occupied by `reserveUnrollMemoryForThisTask` is very high.
    
![pic](https://user-images.githubusercontent.com/12733256/30142120-a3a3dd42-9344-11e7-9ae3-1c36bedf8939.png)



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