explicit state · terminal-first tools · observable failure · measured tails

explore 👀 low-level cool stuff
build 🛠️ focused systems understood end to end
diagnose 🔎 clear cause, clear cost
collaborate 💞️ on low-level cool stuff
believe ✨ the lone wolf survives, but the pack dies

🧪 My other GitHub: @DrunkenRandomWalker
📫 Open an issue here · LinkedIn

Bid/ask binary-search tree rendered in plain text:

 ------ /
|21, 32| /
|21, 21|<
| 20 | \
------ \
-------- /
| 20, 20 | /
|14.1, 21|<
| None | \
-------- \
---------- /
| 19.3, 21 | /
|19.3, 19.3|<
| 19 | \
---------- \
---------- /
| 19, 121 | /
|14.1, 19.3|<
| 20 | \
---------- \
---------- /
|14.1, 199 | /
|14.1, 14.1|<
| 19 | \
---------- \
ASK: min 14.1 max 21
BID: max 13 min 10
------ /
|13, 10| /
|13, 13|<
| 12 | \
------ \
------ /
|12, 10| /
|10, 13|<
| None | \
------ \
------ /
|10, 21| /
|10, 10|<
| 12 | \
------ \

This is a separate BST-backed visualization study. The featured engine uses price-indexed FIFO levels plus an occupancy bitset.

redundant feeds · fixed-capacity ring · copy-aware filtering

Three focused exercises at the market-data boundary: merge duplicate and out-of-order feeds into one ordered stream, select large trades without copying their payloads, and suppress unchanged quotes.

Source and scenarios · UDP merger anatomy

single writer · price-time priority · direct cancellation

A deterministic, in-memory matching engine for studying order-book design, failure boundaries, and the operator surface around a hot path.

Implementation and usage · Design and trade-offs

question -> build -> measure -> explain

• Separate machine output from human diagnostics.
• Reconstruct every transition from stable inputs, IDs, and reason codes.
• Measure tails, saturation, drops, and instrumentation overhead.
• Keep terminal views keyboard-first, stable, and readable without color.

JAX / PyTorch for modeling. Ray for parallel execution. Gym for environment contracts. Deterministic runs. Comparable measurements.

All merged upstream:

• ndarray #978 — API ergonomics around shape metadata
• Alacritty #4923 — underline thickness for double-width terminal cells
• Sapling #50 — integration testing for DAG behavior