Chinesezjc
5c43621ed2
The prior child-flush fix measured each fragment with chunk.encode('utf-8'),
which copies the whole write — under a tight addressSpaceMb a single 340 MiB
write died on that encode (the exact allocation _push_bounded_prefix exists to
avoid), and re-scanning the whole pending list per write was quadratic under a
daemon-thread flood (the concurrent-write test timed out at 28s). Compute each
fragment's serialized cost with _fragment_cost_upto, which walks the str via a
new _json_char_cost (code point to escaped width, no encode) and stops once the
running total passes the budget, and accumulate it into _pending_cost once per
write. The early-flush trigger reads that accumulator: still charges control
chars their full serialized width (a NUL is 6 bytes), but never encodes a whole
write and never re-scans the buffer, so the 340 MiB single-write and
daemon-thread tests pass alongside the NUL-flood one.
Rework the child NUL-flood regression to write in 1 MiB chunks under a 512 MiB
address space so its own argument construction is not the allocation under test.
description, kind
| description | kind |
|---|---|
| Package map for the code-execution capability family: what program execution does for you, and which package owns each part. | package-group |
code-runtime/ — code-execution capability family
English | 中文
Summary
The code-runtime/ group provides program execution: a model writes one program that calls host-provided functions as ordinary async calls, and a runtime executes it in isolation and returns only what the program printed and returned. One package defines the shared capability (ctx.codeRuntime), a second executes TypeScript programs in a fresh Node worker thread, and a third owns the wire protocol between a Node host and a CPython subprocess for the Python backend. Every run is independent — no state carries from one program to the next — and failures come back as part of the result, so the caller can see why a program failed and feed that back to the model.
Table of Contents
Packages
These three packages together provide program execution; each README describes what its part does.
| Package | Role | ctx key |
|---|---|---|
code-runtime/ |
Defines what a code runtime does: run one program against host-provided bindings and report what it printed and returned | ctx.codeRuntime |
code-runtime-worker-thread/ |
Executes TypeScript programs, each in a fresh Node worker thread | registers ctx.codeRuntime |
code-runtime-python/ |
Owns the fd-3 wire protocol between a Node host and a CPython subprocess, the Python backend's protocol layer | — |
Related documentation
Start with the subsystem reference for the service contract, then the PTC mode design that consumes this capability and the capability-seam model it follows.
- Code runtime subsystem reference — request/result vocabulary, bindings, and the
ctx.codeRuntimecordis surface. - PTC mode Agent Note — how the tool registry presents
run_codeto the model. - Capability seams — the Service Definition / Service Provider / Consumer split this family follows.
Dev Note
Working context for maintainers — click to expand
None.