Why jemalloc greatly reduces memory usage?

[adityapatadia]

I have tried running sharp on production system with jemalloc and without jemalloc running glibc with 20.04 ubuntu. I see jemalloc greatly reduces memory usage.

With Jemalloc:

Without Jemalloc:

[lovell]

Did you see the canonical discussion about memory allocators at #955 ?

[adityapatadia]

I saw discussion and only thing I understand is Jemalloc is better retuning memory back to OS. It's strange that glibc which works super well in other scenarios does not work well with sharp/libvips workload. Anyway, this question was asked just out of curiosity.

I am happy with jemalloc.