> Additionally, in C++, requesting that heap memory also requires a syscall every time the container geometrically changes size That is not true - no allocator

> Additionally, in C++, requesting that heap memory also requires a syscall every time the container geometrically changes size That is not true - no allocator I know of (and certainly not the default glibc allocator) allocates memory in this way. It only does a syscall when it doesn’t have free userspace memory to hand out but it overallocates that memory and also reuses memory you’ve already freed.