The worst memory performance bug I ever saw turned out to be heap fragmentation in a non-GC system. There are memory allocators that solve this like https://git

The worst memory performance bug I ever saw turned out to be heap fragmentation in a non-GC system. There are memory allocators that solve this like https://github.com/jemalloc/jemalloc/tree/dev https://github.com/jemalloc/jemalloc/tree/dev but ... they do it by effectively running a GC at the block level As soon as you use atomic counters in a multi-threaded system you can wave goodbye to your scalability too!