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Posted to commits@doris.apache.org by GitBox <gi...@apache.org> on 2019/10/01 15:31:58 UTC
[GitHub] [incubator-doris] imay opened a new issue #1927: ChunkAllocator bad
case
imay opened a new issue #1927: ChunkAllocator bad case
URL: https://github.com/apache/incubator-doris/issues/1927
User found that ChunkAllocator seems that don't work. In above picture, most memory allocation is severed by system allocator. And user found query become slower than before. So I think this may be the bad case of ChunkAllocator.
This may happen in following case. When a huge memory is allocated and freed to Allocator which is the same size with max capacity. In this case, every allocation will try allocate in all cores but fail, and then try to allocate from system. In this situation, performance will be bad. This is a guess not the real reason, I will look into it and try to improve it.
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