memory
4 free lessons tagged memory across Programming, AI. Each one is a short sequence of focused steps with narration and a five-question quiz at the end — take them in any order, no signup required.
Where Time Actually Goes: The Six Usual Suspects
Slow software is slow for a short list of reasons, and each one has a signature you can recognise before you find the code. This lesson covers the six recurring bottleneck classes, waiting on I/O, chatty queries, allocation pressure, lock contention, memory access patterns and serialisation, with the symptom that identifies each and the fix that actually works.
CPython: reference counting and the cyclic GC
How CPython reclaims memory: immediate reference counting for the common case, plus a generational cyclic garbage collector that catches the reference cycles counting cannot. Covers what changes a refcount, generations and thresholds, the gc module, __del__ and weakref, and why a process's memory does not always shrink.
Context Engineering for Long-Running Agents
How to manage, compress, and strategically fill the context window in long-horizon agents — covering summarization checkpoints, scratchpad memory, retrieval injection, prompt caching, and compaction triggers.
CUDA Memory Hierarchy: Global, Shared, Constant, Local, Registers
The five memory spaces a CUDA kernel can see and why they have wildly different speeds. Global vs shared vs constant vs local vs registers, coalesced access, bank conflicts, and a cheat-sheet table you'll actually reference.