https://www.hboehm.info/gc/ https://www.hboehm.info/gc/ is a windows+linux+unix allocator implementation - it uses VirtualAlloc on Windows and mmap or sbrk on U

https://www.hboehm.info/gc/ https://www.hboehm.info/gc/ is a windows+linux+unix allocator implementation - it uses VirtualAlloc on Windows and mmap or sbrk on Unix. For performance reasons (avoiding a syscall) almost all malloc implementations only use sbrk / mmap occasionally and keep the malloc calls in userspace.