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performance (2)

Memory Management — Virtual Memory, Paging, Swap, OOM, mmap

How operating systems give every process its own address space: virtual memory and paging, swap, the OOM killer, mmap, copy-on-write, the page cache, allocator choices (glibc, jemalloc, mimalloc), and how to read memory counters in top, ps, and free.
memory virtual-memory paging swap oom mmap page-cache jemalloc mimalloc sysadmin

Big-O — Complexity Cheat Sheet for Data Structures and Algorithms

A practical Big-O reference — common data structures, algorithms, amortized analysis, space vs time, and language-specific gotchas for Python, JavaScript, and TypeScript.
big-o complexity algorithms data-structures performance asymptotic-analysis