perf: set jemalloc as global allocator #290
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It does not even build on darwin or mingw
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https://jemalloc.net
https://doc.rust-lang.org/std/alloc/index.html#the-global_allocator-attribute
We are not very prudent with our memory allocation. Jemalloc gives us little bit of slack. I measured a moderate speedup of about 7-10% on mpox-500 data.
Once we have a more comprehensive ans automated perf testing suite, we could try and measure other allocators, e.g.