unity empty scene memory leak on ios

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My project supports both ios and android, so I test both. It was strange that the memory was 1gb in android but 1.8gb in ios.

first make sphere 1000, ios memory increased 60mb but android increased 5mb second make empty scene , ios memory 120mb , android 60mb

Feeling strange, I took a sanpshot of an empty scene with xcode. so i see many many leak

is unity error?

anybody help me