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Memory cannot be released after calling Bigarray.Genarray.change_layout. #7505
Original bug ID: 7505
If Bigarray.Genarray.change_layout is called upon a variable, the memory allocated for this variable will never be collected by GC. This increases the memory consumption significantly in some numerical applications.
Steps to reproduce
I tested on OSX, OCaml 4.04. Test 1 is totally fine, consumes about 30MB. Test 2 is bad, memory consumption exploded (over 30GB), simply because I added change_layout function.