Disk and file-based cache
Project description
DiskCache is an Apache2 licensed disk and file backed cache library, written in pure-Python, and compatible with Django.
The cloud-based computing of 2016 puts a premium on memory. Gigabytes of empty space is left on disks as processes vie for memory. Among these processes is Memcached (and sometimes Redis) which is used as a cache. Wouldn’t it be nice to leverage empty disk space for caching?
Django is Python’s most popular web framework and ships with several caching backends. Unfortunately the file-based cache in Django is essentially broken. The culling method is random and large caches repeatedly scan a cache directory which slows linearly with growth. Should it really take ~60ms to store a key in a cache with a thousand items?
In Python, we can do better. And we can do it in pure-Python!
In [1]: import pylibmc
In [2]: client = pylibmc.Client(['127.0.0.1'], binary=True)
In [3]: client[b'key'] = b'value'
In [4]: %timeit client[b'key']
10000 loops, best of 3: 25.4 µs per loop
In [5]: import diskcache as dc
In [6]: cache = dc.Cache('tmp')
In [7]: cache[b'key'] = b'value'
In [8]: %timeit cache[b'key']
100000 loops, best of 3: 11.8 µs per loop
Note: Micro-benchmarks have their place but are not a substitute for real measurements. DiskCache offers cache benchmarks to defend its performance claims. Micro-optimizations are avoided but your mileage may vary.
DiskCache efficiently opens up gigabytes of storage space for caching. By leveraging rock-solid database libraries and memory-mapped files, cache performance can match and exceed industry standard solutions. There’s no need for a C compiler or running another process. Performance is a feature and testing has 100% coverage with unit tests and hours of stress.
Testimonials
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Features
Pure-Python
Fully Documented
Benchmark comparisons (alternatives, Django cache backends)
100% test coverage
Hours of stress testing
Performance matters
Django compatible API
Thread-safe and process-safe
Supports multiple eviction policies (LRU and LFU included)
Keys support “tag” metadata and eviction
Developed on Python 2.7
Tested on CPython 2.7, 3.4, 3.5 and PyPy
Quickstart
Installing DiskCache is simple with pip:
$ pip install diskcache
You can access documentation in the interpreter with Python’s built-in help function:
>>> from diskcache import Cache, FanoutCache, DjangoCache >>> help(Cache) >>> help(FanoutCache) >>> help(DjangoCache)
User Guide
For those wanting more details, this part of the documentation describes introduction, benchmarks, development, and API.
Reference and Indices
DiskCache License
Copyright 2016 Grant Jenks
Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
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