#C

A deep systems engineering guide to zero-copy data formats: how FlatBuffers, Cap'n Proto, and Apache Arrow eliminate serialization and deserialization overhead using relative pointer offsets, vtables, memory-mapped I/O, and columnar in-place memory layouts.

A deep systems engineering guide to memory allocators in multi-threaded backends: why glibc malloc suffers from lock contention and fragmentation, the internal architecture of jemalloc, mimalloc, and TCMalloc (thread-local caches, arenas, slab bins), and benchmarks in Rust and C++.

A deep systems engineering guide to Linux kernel-bypass networking: why the standard Linux network stack caps out at high packet rates, the internal architecture of eXpress Data Path (XDP), action codes (XDP_DROP, XDP_TX, XDP_REDIRECT), zero-copy user-space networking with AF_XDP (XSK), and building a line-rate DDoS firewall in C.

A deep systems engineering breakdown of Linux asynchronous I/O: why epoll hits a syscall scalability wall at millions of IOPS, the lockless dual-ring buffer architecture of io_uring (SQ & CQ), zero-syscall I/O with SQPOLL, registered buffers, and building high-concurrency network servers in C and Rust.