Posts to read for fun, like taking everything apart over a coffee to see what's inside, down to the deepest bolt. Come away understanding more, judging more clearly and deciding with a steadier hand.
A function call takes 0.4 ns, a system call 345 ns. The kernel, processes, threads and scheduling, drivers and devices, then CPUs and GPUs: two designs for two kinds of work, measured with the same matrix multiplication at four sizes.
Every program sees its own address space, malloc is only a promise, and RAM is used only when a page is first touched. The stack and the heap, pages, page faults, the TLB, why segfaults happen, and how many bytes a Python list really costs.