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html.parser vs regex Tag Strip: Localhost Lab

copy.copy vs dict.copy Shallow: Localhost Lab

ExitStack vs Nested with Resources: Localhost Lab

Hands-on contextlib.ExitStack vs nested with and manual close: real cycles/s for N resources, measured on Linux localhost in this hands-on lab for SREs.

itertools.batched vs Manual Chunking: Localhost Lab

Hands-on itertools.batched vs manual list-slice chunking: real items/s batching sequences, measured on Linux localhost today in this hands-on lab for SREs.

StringIO vs list-join Builder: Localhost Lab

Queue vs deque Threaded Handoff: Localhost Lab

Context-Switch Microbench: Pipe Ping-Pong Process vs Thread

Hands-on ctx-switch lab: process pipe RTT p50 3.2 us (~0.50M sw/s); thread pipe 2.85 us; Event 9.3 us; 6 hogs blow p95 to 19 us. Real numbers, no Docker.

Asyncio vs Threads: I/O Concurrency Lab with Real Numbers

Hands-on asyncio vs ThreadPool lab: sleep 58.7× vs 44×; delayed TCP 13.8× vs serial; fast-echo trap loses; CPU flat. Real localhost numbers, no Docker.

flock Contention Lab: Exclusive, Shared, and LOCK_NB Fail Rates

Hands-on flock lab: uncontended LOCK_EX p50 0.33 us; waiter ~50 ms hold; w8 p50 ~36 ms; LOCK_NB 99% fail; LOCK_SH ~6.7x wall. Real numbers, no Docker.

OpenSSL TLS Handshake Lab: Full vs Resume on Localhost

Hands-on TLS handshake lab: Python full HS p50 TLS1.3 1.51 ms vs TLS1.2 1.20 ms (~72× TCP); openssl resume ~1.5× / 4.1×. Localhost RSA numbers, no Docker.

epoll vs select Toy: Ready-Wait Latency and the FD_SETSIZE Cliff

Hands-on epoll vs select toy: ready-wait flat ~3.5 µs (8→900 FDs); select scales 4.6→16.9 µs then hits fd≥1024 cliff. Python numbers, no Docker.

sendfile vs Userspace Copy: Localhost TCP File Serve Lab

Hands-on sendfile vs read+sendall lab: 256 MiB p50 4.41 vs 2.34 GB/s (~1.9×); copy collapses at 4 KiB. Warm localhost TCP measured, no Docker.