python-memory-safe-scripts skillA
python-memory-safe-scripts is agent-read markdown (skill) from terrylica/cc-skills: Memory-safe Python script patterns for long-running processes under systemd MemoryMax constraints. Covers allocator purge (mimalloc/glibc malloc_trim), HTTP response lifecycle, DataFrame cleanup, thread-local connection reuse, and periodic GC cadence. Battle-tested through 5 OOM optimization cycles on production GPU workstations. Use this skill proactively whenever writing or reviewing Python scripts that: run under systemd with MemoryMax, process data in loops (downloads, ETL, backfill), use Th.
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Memory-Safe Python Script Patterns Battle-tested patterns for keeping Python scripts alive under systemd `MemoryMax` constraints. Extracted from `repair_direct_parquet.py` (24-worker parallel repair) and `exness_tick_cache_seeder.py` (10-symbol daily seeder) after 5 OOM optimization cycles on a 62 GB GPU workstation. **Core insight**: Python's garbage collector frees objects, but the C allocator (glibc ptmalloc2) does NOT return freed pages to the OS. Without explicit `malloc_trim(0)`, RSS only grows — even after `del` and `gc.collect()`. mimalloc with `MIMALLOC_PURGE_DELAY` helps but explicit purge is faster. > **Self-Evolving Skill**: This skill improves through use. If instructions are wrong, parameters drifted, or a workaround was needed — fix this file immediately, don't defer. Only update for real, reproducible issues. ## The 7 Patterns ### 1. Cached Allocator Purge The most important pattern. Cache the ctypes library handle on first call so subsequent purges are a single FFI invocation with zero allocation overhead. ```python import ctypes import gc import sys _purge_lib = None _purge_method = None # "mimalloc" | "glibc" | "none" def _force_allocator_purge(): …
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How to install
mdr add terrylica/cc-skills/python-memory-safe-scripts@git:20260401.b664eafmdr add terrylica/cc-skills/python-memory-safe-scripts@sha256:72317a0b541c88fcPin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_plsivvsmsviepqhl)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260401.b664eaf latest | 2026-04-01 | b664eaf | 11,858 B | A | view · diff |
| git:20260401.6be22af | 2026-04-01 | 6be22af | 11,636 B | A | view · diff |
| git:20260324.e205bec | 2026-03-24 | e205bec | 11,066 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (11858 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
terrylica/cc-skills · 74 stars · license MIT · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_plsivvsmsviepqhl GET https://markdownregistry.com/api/v1/resolve?ref=terrylica/cc-skills/python-memory-safe-scripts GET https://markdownregistry.com/api/v1/blob/72317a0b541c88fc66a0883b223ee68287e1a2db5b25e39cec45a5dcd96c5aa2
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