warp_cache
A thread-safe Python caching decorator built in Rust. Uses SIEVE eviction and GIL-conditional locking - no overhead under the GIL, per-shard RwLock when the GIL is disabled.
Why this exists
I needed single @cache() decorator that works across sync functions, async functions, and threads - with TTL - without juggling separate solutions. Existing options each had gaps:
functools.lru_cache- not thread-safe (needs manualLock), no TTL, no async awarenesscachetools- has TTL and multiple strategies, but pure Python (slow) and not thread-safecachebox/moka-py- Rust-backed and thread-safe, but weren't designed for GIL-conditional locking or shared memory
warp_cache fills this gap: one decorator, thread-safe by default, async-aware (cache hits return without awaiting), TTL support, and shared memory backend for cross-process use.
With free-threaded Python (3.13+) removing the GIL, thread-safe caching stops being optional. warp_cache handles both cases via conditional compilation (GilCell under GIL, RwLock under no-GIL).
Quick start
from warp_cache import cache
@cache()
def expensive(x, y):
return x + y
expensive(1, 2) # computes and caches
expensive(1, 2) # returns cached result
If you're already using functools.lru_cache, switching is one-line change. Unlike lru_cache, this is thread-safe out of the box:
-from functools import lru_cache
+from warp_cache import cache
-@lru_cache(maxsize=128)
+@cache(max_size=128)
def expensive(x, y):
return x + y
Like lru_cache, all arguments must be hashable. See the usage guide for details.
How it works
Entire cache lookup happens in single Rust __call__ - no Python wrapper function, no serialization, no key allocation on hits:
Python: fn(42)
└─ tp_call (PyO3) ─────────────────────────────── one FFI crossing
├─ hash(args) via ffi::PyObject_Hash (raw FFI, no PyO3 wrapper)
├─ shard select hash & shard_mask (power-of-2 bitmask)
├─ GilCell::read() zero-cost under GIL (UnsafeCell)
├─ HashMap lookup hashbrown + passthrough hasher (no re-hash)
├─ equality check via ffi::PyObject_RichCompareBool (borrowed pointer)
├─ SIEVE visited=1 AtomicBool store, lock-free
└─ return cached value
On cache hit, the lookup uses BorrowedArgs (a raw pointer + precomputed hash) via hashbrown's Equivalent trait, so there is no CacheKey allocation and no refcount churn. CacheKey is only created on miss when the entry needs to be stored.
Two backends:
- Memory (default) - sharded
hashbrown::HashMapwith passthrough hasher andGilCell/RwLocklocking. Everything stays in-process. - Shared (
backend="shared") - mmap'd shared memory with seqlock. Reads don't take any locks (optimistic seqlock path). Serialization uses a fast-path for primitives (serde), with pickle fallback for complex types.
Why SIEVE
Both backends use SIEVE (NSDI'24) for eviction. The main reason: cache hits don't need a write lock.
LRU requires reordering a linked list on every hit - that means write lock (or CAS loop) on every read. SIEVE replaces this with a single store (visited = 1), which needs no lock on either backend. On eviction, a "hand" scans the entry list: visited entries get a second chance (bit cleared), unvisited entries get evicted.
Why not the others:
- LRU - write lock on every hit, which defeats the point of GilCell
- ARC - two lists + ghost entries, much more complex for small gains
- TinyLFU - frequency counting overhead, bloom filter maintenance
The hit rate is also better than LRU. Measured with Zipf-distributed keys (1M requests, benchmarks/bench_sieve.py):
| Workload | SIEVE | LRU | Miss Reduction |
|---|---|---|---|
| Zipf, 10% cache | 74.5% | 67.5% | +21.6% |
| Scan resistance (70% hot) | 69.9% | 63.5% | +17.6% |
| One-hit wonders (25% unique) | 53.9% | 43.7% | +18.1% |
| Working set shift | 75.5% | 69.7% | +16.6% |
See eviction quality benchmarks for the full breakdown.
Performance
Python 3.13.2, Apple M-series (arm64), cache size 256, Zipf-distributed keys (2000 unique), median of 3 rounds. Source: benchmarks/
If you need thread-safe caching, warp_cache is the fastest option available. If you don't need thread safety, lru_cache is faster - it's C code in CPython with no FFI boundary to cross.
Single-threaded
| Library | ops/s | Notes |
|---|---|---|
| lru_cache | 31.0M | C code, no FFI, no safety overhead |
| warp_cache | 20.4M | Rust via PyO3, thread-safe, SIEVE |
| moka_py | 3.9M | Rust (moka), thread-safe |
| cachebox | 1.5M | Rust, thread-safe |
| cachetools | 826K | Pure Python, not thread-safe |
lru_cache wins by about 1.5x single-threaded. The gap comes from PyO3 call dispatch (~5ns) and refcount management (~3ns) - the price you pay for crossing an FFI boundary with a safe wrapper.
Multi-threaded (GIL-enabled)
| Threads | warp_cache | lru_cache + Lock | cachetools + Lock |
|---|---|---|---|
| 1 | 20.7M | 12.6M | 767K |
| 4 | 20.8M | 12.5M | 788K |
| 8 | 20.4M | 12.6M | 793K |
| 16 | 19.5M | 11.9M | 795K |
With multiple threads, warp_cache is about 1.6x faster than lru_cache + Lock. lru_cache itself isn't thread-safe, so real multi-threaded code needs a threading.Lock() on every call, and that lock overhead adds up. warp_cache's GilCell has no overhead under the GIL because the GIL itself already serializes access.
Shared memory (cross-process)
| Processes | Total Throughput | Per-Process Avg |
|---|---|---|
| 1 | 5.0M ops/s | 5.0M ops/s |
| 2 | 7.8M ops/s | 3.4M ops/s |
| 4 | 8.1M ops/s | 2.0M ops/s |
The seqlock's optimistic read path means reads don't take locks, which is why multi-process scaling works. No other Python cache library has cross-process shared memory.
Full benchmarks and optimization history in docs/performance.md.
Installation
Prebuilt wheels are available for Linux (x86_64, aarch64), macOS (x86_64, arm64), and Windows (x86_64):
pip install warp_cache
If no wheel is available for your platform, pip will fall back to the source distribution (requires a Rust toolchain).
Design notes
Why single FFI crossing? Early versions had Python wrapper around Rust cache - two FFI crossings per call. Moving __call__ into Rust saves ~10-15ns by cutting out the wrapper.
Why BorrowedArgs? On cache hit we only need to look up a key, not store it. BorrowedArgs holds a raw pointer + precomputed hash and implements hashbrown's Equivalent trait, so there is no allocation on the hot path. CacheKey (which owns the PyObject) is only created on miss.
Why PassthroughHasher? Python already computes hashes for all hashable objects. Feeding that through hashbrown's default foldhash would just re-hash something that's already hashed. PassthroughHasher passes it through as-is, saves ~1-2ns per lookup.
Why GilCell instead of RwLock? When the GIL is enabled, it already serializes access, so a real RwLock would just waste ~8ns per hit doing nothing useful. GilCell is an UnsafeCell wrapper with the same API as RwLock but no actual locking. Under free-threaded Python (#[cfg(Py_GIL_DISABLED)]), real per-shard RwLock is compiled in instead.
Why sharded HashMap? Under free-threaded Python, per-shard RwLock lets different threads read from different shards in parallel. Shard count is power-of-2 (selected via hash & shard_mask) for bitmask indexing.
Why seqlock for shared memory? Cross-process synchronization can't use futexes portably. The seqlock does optimistic reads (just check a sequence counter) with a TTAS spinlock for writes - all in userspace, no kernel calls on the read side.
Status
- Core API is stable. Prebuilt wheels on PyPI, Python 3.9-3.14.
- Free-threading codepath (
#[cfg(Py_GIL_DISABLED)]) is tested but gets less real-world usage than the GIL-enabled path. - Shared memory layout is v3, stable. Existing shared caches survive process restarts.
When warp_cache makes sense:
- You need thread-safe caching (especially with free-threaded Python)
- You need TTL, async support, or cross-process shared memory
- You want better eviction than LRU without configuring anything
When to use something else:
- Maximum single-threaded speed, no thread safety needed - use
functools.lru_cache - Stampede prevention or per-entry TTL - use
cacheboxormoka-py - Manual cache object API (dict-like interface) - use
moka-pyorcachebox
Documentation
- Usage guide - SIEVE eviction, async, TTL, shared memory, decorator parameters
- Performance - benchmarks, architecture details, optimization history
- Alternatives - comparison with cachebox, moka-py, cachetools, lru_cache
- Examples - runnable scripts for every feature (
uv run examples/<name>.py) - llms.txt / llms-full.txt - project info for LLMs and AI agents (spec)
Contributing
Contributions welcome! See CONTRIBUTING.md for setup instructions, coding standards, and PR guidelines.
For security issues, please see SECURITY.md.
License
MIT
1 maintainer
Metadata
1 maintainer
Release files for warp-cache 0.7.0
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