Python bindings for libCacheSim

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Project description

libCacheSim Python Binding

libCacheSim is fast with the features from underlying libCacheSim lib:

High performance - over 20M requests/sec for a realistic trace replay
High memory efficiency - predictable and small memory footprint
Parallelism out-of-the-box - uses the many CPU cores to speed up trace analysis and cache simulations

libCacheSim is flexible and easy to use with:

Seamless integration with open-source cache dataset consisting of thousands traces hosted on S3
High-throughput simulation with the underlying libCacheSim lib
Detailed cache requests and other internal data control
Customized plugin cache development without any compilation

Installation

Quick Install

Binary installers for the latest released version are available at the Python Package Index (PyPI).

pip install libcachesim

Visit our documentation to learn more.

Installation from sources

If there are no wheels suitable for your environment, consider building from source.

git clone https://github.com/cacheMon/libCacheSim-python.git
cd libCacheSim-python
bash scripts/install.sh

Run all tests to ensure the package works.

python -m pytest tests/

Quick Start

Cache Simulation

With libcachesim installed, you can start cache simulation for some eviction algorithm and cache traces:

import libcachesim as lcs

# Step 1: Open a trace hosted on S3 (find more via https://github.com/cacheMon/cache_dataset)
URI = "s3://cache-datasets/cache_dataset_oracleGeneral/2007_msr/msr_hm_0.oracleGeneral.zst"
reader = lcs.TraceReader(
    trace = URI,
    trace_type = lcs.TraceType.ORACLE_GENERAL_TRACE,
    reader_init_params = lcs.ReaderInitParam(ignore_obj_size=False)
)

# Step 2: Initialize cache
# Note: cache_size as float (0.1) means 10% of the reader's total working set size in bytes.
# To specify an absolute size, pass an integer (e.g., 1024*1024 for 1MB).
cache = lcs.S3FIFO(
    cache_size=0.1,  # 0.1 = 10% of trace's working set size (requires reader parameter)
    # Cache specific parameters
    small_size_ratio=0.2,
    ghost_size_ratio=0.8,
    move_to_main_threshold=2,
    reader=reader,  # Required when cache_size is a float ratio
)

# Step 3: Process entire trace efficiently (C++ backend)
req_miss_ratio, byte_miss_ratio = cache.process_trace(reader)
print(f"Request miss ratio: {req_miss_ratio:.4f}, Byte miss ratio: {byte_miss_ratio:.4f}")

# Step 3.1: Process the first 1000 requests
# Note: cache_size as float means a ratio of the working set size (requires reader parameter)
cache = lcs.S3FIFO(
    cache_size=0.1,  # 10% of trace's working set size
    # Cache specific parameters
    small_size_ratio=0.2,
    ghost_size_ratio=0.8,
    move_to_main_threshold=2,
    reader=reader,  # Required when cache_size is a float ratio
)
req_miss_ratio, byte_miss_ratio = cache.process_trace(reader, start_req=0, max_req=1000)
print(f"Request miss ratio: {req_miss_ratio:.4f}, Byte miss ratio: {byte_miss_ratio:.4f}")

Plugin System

libCacheSim allows you to develop your own cache eviction algorithms and test them via the plugin system without any C/C++ compilation required.

Plugin Cache Overview

The PluginCache allows you to define custom caching behavior through Python callback functions. You need to implement these callback functions:

Function	Signature	Description
`init_hook`	`(common_cache_params: CommonCacheParams) -> Any`	Initialize your data structure
`hit_hook`	`(data: Any, request: Request) -> None`	Handle cache hits
`miss_hook`	`(data: Any, request: Request) -> None`	Handle cache misses
`eviction_hook`	`(data: Any, request: Request) -> int`	Return object ID to evict
`remove_hook`	`(data: Any, obj_id: int) -> None`	Clean up when object removed
`free_hook`	`(data: Any) -> None`	[Optional] Final cleanup

Example: Implementing LRU via Plugin System

from collections import OrderedDict
from typing import Any

from libcachesim import PluginCache, LRU, CommonCacheParams, Request, SyntheticReader

def init_hook(_: CommonCacheParams) -> Any:
    return OrderedDict()

def hit_hook(data: Any, req: Request) -> None:
    data.move_to_end(req.obj_id, last=True)

def miss_hook(data: Any, req: Request) -> None:
    data.__setitem__(req.obj_id, req.obj_size)

def eviction_hook(data: Any, _: Request) -> int:
    return data.popitem(last=False)[0]

def remove_hook(data: Any, obj_id: int) -> None:
    data.pop(obj_id, None)

def free_hook(data: Any) -> None:
    data.clear()

plugin_lru_cache = PluginCache(
    cache_size=128,
    cache_init_hook=init_hook,
    cache_hit_hook=hit_hook,
    cache_miss_hook=miss_hook,
    cache_eviction_hook=eviction_hook,
    cache_remove_hook=remove_hook,
    cache_free_hook=free_hook,
    cache_name="Plugin_LRU",
)

reader = SyntheticReader(
    num_objects=1000, num_of_req=10000, obj_size=1, alpha=1.0, dist="zipf"
)
req_miss_ratio, byte_miss_ratio = plugin_lru_cache.process_trace(reader)

By defining custom hook functions for cache initialization, hit, miss, eviction, removal, and cleanup, users can easily prototype and test their own cache eviction algorithms.

Getting Help

Check project documentation for detailed guides
Open issues on GitHub
Review examples in the main repository

Reference

Please cite the following papers if you use libCacheSim.

@inproceedings{yang2020-workload,
    author = {Juncheng Yang and Yao Yue and K. V. Rashmi},
    title = {A large-scale analysis of hundreds of in-memory cache clusters at Twitter},
    booktitle = {14th USENIX Symposium on Operating Systems Design and Implementation (OSDI 20)},
    year = {2020},
    isbn = {978-1-939133-19-9},
    pages = {191--208},
    url = {https://www.usenix.org/conference/osdi20/presentation/yang},
    publisher = {USENIX Association},
}

@inproceedings{yang2023-s3fifo,
  title = {FIFO Queues Are All You Need for Cache Eviction},
  author = {Juncheng Yang and Yazhuo Zhang and Ziyue Qiu and Yao Yue and K.V. Rashmi},
  isbn = {9798400702297},
  publisher = {Association for Computing Machinery},
  booktitle = {Symposium on Operating Systems Principles (SOSP'23)},
  pages = {130–149},
  numpages = {20},
  year={2023}
}

@inproceedings{yang2023-qdlp,
  author = {Juncheng Yang and Ziyue Qiu and Yazhuo Zhang and Yao Yue and K.V. Rashmi},
  title = {FIFO Can Be Better than LRU: The Power of Lazy Promotion and Quick Demotion},
  year = {2023},
  isbn = {9798400701955},
  publisher = {Association for Computing Machinery},
  doi = {10.1145/3593856.3595887},
  booktitle = {Proceedings of the 19th Workshop on Hot Topics in Operating Systems (HotOS23)},
  pages = {70–79},
  numpages = {10},
}

If you used libCacheSim in your research, please cite the above papers.

License

See LICENSE for details.

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Release history Release notifications | RSS feed

This version

0.3.3.post4

Feb 17, 2026

0.3.3.post3

Aug 23, 2025

0.3.3.post2

Aug 4, 2025

0.3.3

Aug 3, 2025

0.3.2

Jul 14, 2025

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Upload date: Feb 17, 2026
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Upload date: Feb 17, 2026
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The following attestation bundles were made for libcachesim-0.3.3.post4-cp310-cp310-macosx_15_0_arm64.whl:

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- Trigger Event: release

libcachesim 0.3.3.post4

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