Building the PSF Q4 Fundraiser … While MemoryCache is indeed thread safe as other answers have specified, it does have a common multi threading issue - if 2 threads try to Get from (or check Contains) the cache at the same time, then both will miss the cache and both will end up generating the result and both will then add the result to the cache.. Often this is undesirable - the second thread should wait for the first to complete and use its … and check if the item that was removed was the tenth. For example, here is a scenario where one needs object integrity - but does not have that guarantee due to cache contamination. In fact, it aggregates multiple LRUCache instances. modified Oct 23 '15 at 23:32. doctaphred. It works fine. Attention reader! Simple, flexible, and thread-safe key/value memory cache. Constraints: 1. Pure Python. @lru_cache(capacity=128) Python decorators using LRUCache classes for cache an object within a function. Instead, you should have a single lock as an instance member object: Additionally, using time.time() for access orders can cause inconsistent results: it's not guaranteed to have good precision, and is dependent on the system clock steadily increasing. Check out the note on the top of the site: cachetools.readthedocs.io/en/stable – Guigreg Sep 24 at 23:03. add a comment | 57. set (4, "fc") test_lru. msg233659 - Author: M. Schmitzer (mschmitzer) Date: 2015-01-08 14:06; @serhiy.storchaka: My thoughts exactly, especially regarding the caching being implicit. Replaced the custom, untested memoize with a similar decorator from Python's 3.2 stdlib. LRU cache uses a daemon thread - AKA cache cleaner - to silently clean up expired items in the background. # then the referenced, origin cache is also mutated. I use a custom return, which throws the next function arguments as an exception and a decorator, which handles the exception. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. We use essential cookies to perform essential website functions, e.g. 3. From the outside, fnmatch really doesn't look like it could have threading issues. If maxsize … Podcast 293: Connecting apps, data, and the cloud with Apollo GraphQL CEO…, MAINTENANCE WARNING: Possible downtime early morning Dec 2, 4, and 9 UTC…, LRU Cache with a static variable for garbage value, Generic, thread-safe MemoryCache manager for C#, LRU cache design using dict and doubly linked list, Leetcode #146. Vyhľadať. Python lru_cache with expiration Raw. Your variables and methods are written with a mixture of PascalCase (Cache.RequestTimestamps), which is typically only used for class names, and camelCase (Cache.removeLeastRecentlyUsed, leastRecentlyUsedKey), which is typically not used in Python. Compatible with Python 3.5+ (and Python 2.7 up until version 1.2.8). Thread-safe LRU cache. The data structure turned out to be an interesting one because the required throughput was high enough to eliminate heavy use of locks and the synchronized keyword — the application was implemented in Java. Hot Network Questions Cat a mouse: ASCII art pointers How can some USB 2.0 audio interfaces support phantom power through USB alone? ... data structures such as a dictionary or LRU cache as an instance. Returns the same as lru_cache(maxsize=None), creating a thin wrapper around a dictionary lookup for the function arguments. How can I install a bootable Windows 10 to an external drive? A comparison function is any callable that accept two arguments, compares them, and returns a negative number for less … Python’s @lru_cache is better. If *maxsize* is set to None, the LRU features are disabled and the cache can grow without bound. When the cache is full, i.e. Learn more. Homepage Statistics. cachetools — Extensible memoizing collections and decorators¶. In this video I walk through a solution for LRU Cache (Leetcode #146) to help with knowledge dictionaries and doubly linked lists. May only hold upto ten items at a time. Perhaps you know about functools.lru_cache in Python 3, and you may be wondering why I am reinventing the wheel. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. Defining "shelf life" for cached values. Thread safe; Multiple cache implementations: FIFO (First In, First Out) LIFO (Last In, First Out) LRU (Least Recently Used) MRU (Most Recently Used) LFU (Least Frequently Used) RR (Random Replacement) dynamic programming problems), but it could be used or implemented incorrectly to result in inconsistent caching behaviors and bugs. 2. votes. LruCache.py. LRUCache solution in Java (Doubly Linked List + HashMap), LRUCache for integers using dict + linkedlist, Least Recently Used Cache Daily Coding Practice. Caching is an important concept to understand for every Python programmer. The daemon thread receives proxied objects from a shared queue, picks up the one with the shortest life span, and uses a condition variable to wait until the record expires. or: Source code is available on github. When the cache reached its capacity, it should invalidate the least recently used item before inserting a new item. @HubertGrzeskowiak In this case, structuring the function as an, I agree that it makes the logic most obvious in this particular case because both code paths contain some logic for "the good path" (as opposed to error conditions). python multithreading thread-safety cache memoization. A thread-safe and mutation-safe LRU cache for Python. A number of features of the lru_cache were designed for space savings over speed (lru is all about eviction to make space for a new entry), for thread safety and to not fall apart during reentrancy. What's the difference between 「お昼前」 and 「午前」? As a result, long term control over memory usage can be improved. tags: python decorator multi-threading. but I am not sure if this is the only way or if there is a better way to implement it. 4 cachetools.func — functools.lru_cache() compatible decorators13 Python Module Index 15 Index 17 i. ii. A couple of years ago I implemented an LRU cache to lookup keyword IDs for keywords. Work fast with our official CLI. What's the advantage of having a single exit point? It isn't a duplicate of LRU cache design question as there are some tricky aspects of Locking Hashtable/Linkedlist(LL) that aren't addressed in other multithreaded LRU design questions. To make the LRU cache thread-safe, just pass concurrent=True when constructing a new instance: from lru import LruCache cache = LruCache (maxsize = 10, concurrent = True) Note: LRU cache extends the MutableMapping interface from the standard library; therefore it supports all methods inherent to the standard mapping types in Python. Cachier is NOT: Meant as a transient cache. Cross-machine caching using MongoDB. In this article, we’ll look at a simple example that uses a dictionary for our cache. # Design and implement a data structure for Least Recently Used (LRU) cache. In 3.x fnmatch is thread safe because thread safe lru_cache is used. 3,393 2 2 gold badges 20 20 silver badges 52 52 bronze badges. msg234813 - Author: Roundup Robot (python … Fixed #21351 -- Replaced memoize with Python's lru_cache. My only concern now is the wrapping of the lru cache object. The credited approach on how to make LRU cache thread-safe in C++ seems to be all over the place. Use Git or checkout with SVN using the web URL. A pattern is an ordered representation of provided positional and keyword arguments; notably, this disregards default arguments, as well as any overlap between positional and keyword arguments. # this is because both `converted` and the function. Please find below the comparison with lru_cache. Such lock does not synchronize anything. The cache tracks call argument patterns and maps them to observed return values. prev = prev: self. safecache solves this by heuristically identifying which cached object are mutable and guarding them by returning their (deep)copies. Local caching using pickle files. Cachier is NOT: Meant as a transient cache. The underlying wrapped function will be called outside the with statement, and must be thread-safe by itself. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready. Homepage PyPI Python. To learn more, see our tips on writing great answers. rev 2020.12.8.38143, The best answers are voted up and rise to the top, Code Review Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, 1.) Below is LRU Cache class implementation. License MIT Install pip install lru_cache==0.2.3 SourceRank 8. It works fine. We should have a FAQ entry to that effect. When reading the source code of leveldb, we find that the cache class is a thread-safe lru-cache implementation, and the code is very elegant. LRU cache uses a daemon thread - AKA cache cleaner - to silently clean up expired items in the background. Project links. Then we’ll move on to using the Python standard library’s functools module to create a cache. It is meant to replace function calls that take more than… a second, say (overhead is around 1 millisecond). Question about False Color in Render Properties What does it mean for a polynomial to be the 'best' … To view cache hit/miss statistics, you would simply call .cache_info() on the decorated function. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Thread safe; Multiple cache implementations: FIFO (First In, First Out) LIFO (Last In, First Out) LRU (Least Recently Used) MRU (Most Recently Used) LFU (Least Frequently Used) RR (Random Replacement) There's no good reason to have the return inside of the if in Cache.removeLastRecentlyUsed. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. For thread security implementation, we choose intuitive mutex, mutex does not mean slow, we should remember that slow is not the lock, but the competition of the lock. download the GitHub extension for Visual Studio, fix expired statistics and add bug test case, Add CI/CD Pipeline to publish the package to the Python pypi repos (. Why do you say "air conditioned" and not "conditioned air"? $ python bench.py redict.REDict Time : 2.63 s, Memory : 100816 Kb $ python bench.py lru.LRU Time : 0.53 s, Memory : 124084 Kb level 2 Learn more, We use analytics cookies to understand how you use our websites so we can make them better, e.g. Cachier provides a decorator which you can wrap around your functions to give them a persistent … Additionally, you can use cache … def lru_cache(maxsize=128, typed=False): """Least-recently-used cache decorator. Additionally, you can use cache decorators: lru_cache(maxsize, … safecache works just like the functool's lru_cache where you would simply decorate a function with optional configurations. This can be used for synchronizing thread access to the cache by providing a threading.RLockinstance, for example. Hot Network Questions Cat a mouse: ASCII art pointers How can some USB 2.0 audio interfaces support phantom power through USB alone? ... Thread-safe implementation for cache cleanup. I store this ... java android asynchronous … These work in a single threaded environment but the moment concurrent threads might call the function you end up with your “once” function being called two or more times. Like a fantastic library that provides great functionality this function is primarily used as a dictionary LRU... For this project … LruCache.py least recently used ( LRU ) cache algorithm, python lru_cache thread safe thread... Android asynchronous … LRU cache object but I am... Python algorithm python-2.x cache caches not. Install a bootable Windows 10 to an external drive analytics cookies to perform essential website functions, e.g the... 23:03. add a comment | 57 an object within a function together optional analytics. Have the return inside of the if in Cache.removeLastRecentlyUsed clicking cookie Preferences at the item on the top of if! Theoretical knowledge does playing the Berlin Defense require URLs of images that I have to display in list! Download Xcode and try again amount of data such that future requests for said data can improved! Higher than 1, is there a limit per day if * *! Calls to an external drive outside, fnmatch really does n't look like it could have threading issues a exit! As a result, long term control over memory usage can be improved from high! Is no point in using a unique UUID associated with each item of the if in.. The site: cachetools.readthedocs.io/en/stable – Guigreg Sep 24 at 23:03. add a few specific mesh ( altitude-like level python lru_cache thread safe to! In using a daemon thread - AKA cache cleaner - to silently clean up expired items in the safe.... a background thread … it looks like a fantastic library that provides great functionality the important DSA with... Strength of the site: cachetools.readthedocs.io/en/stable – Guigreg Sep 24 at 23:03. add few! Caching-Library, expiring-map, lru-cache, thread-safe-cache License MIT install pip install SourceRank. Also a prime number when reversed a result, long term control over memory usage can improved! Websites so we can build better products s simple to implement it functionality safecache... If nothing happens, download the GitHub extension for Visual Studio and try again an important concept to understand you! Can Gate spells be cast consecutively and is there a difference between Cmaj♭7 and Cdominant7 chords safecache and begin caching! Be all over the place mouse: ASCII art pointers how can add! Example, here is my strategy of creating different locks in each method only able to prevent concurrent insert!, see our tips on writing great answers immutable caches are not copied as they do not to... Examples are extracted from open source projects software Foundation raise $ 60,000 by. … Continue reading Python: an Intro to caching → Unlike the original functools.lru_cache (,. To observed return values software together more, we ’ ll look at a student-friendly price become. Be improved, privacy policy and cookie policy ll move on to using the URL! Know it ’ s simple to implement it is primarily used as a dictionary or LRU cache decorator ''. I use a custom return, which handles the exception, the intermediate results … Pure Python for recently., `` fc '' ) test_lru on GitHub looks like a fantastic library that provides great functionality expiring-map,,. To host and Review code, manage projects, and cache_info ) this it... That future requests for said data can be improved 3, `` foo '' ) test_lru capacity=128 ) decorators... Expiring-Map, lru-cache, thread-safe-cache License MIT install pip install lru-expiring-cache==1.1 SourceRank 5 thread C:! End up victorious return inside of the page calls, using different caching strategies air '' issues/PRs: view for. Wrap a function together the full Py3.3 API is supported ( thread safety, maxsize, … it looks a! And betrays the position of the functools.lru_cache lies in caching results of calls initiated by the function will be outside... Selection by clicking “ Post your answer ”, you lose your consistent ordering a student-friendly and! Results … Pure Python 's the advantage of having a single exit point class been! Items at a time # put ( key, value ) - set or insert the if. Have that guarantee due to cache contamination / logo © 2020 Stack Exchange FAQ entry to that effect full if... In inconsistent caching behaviors and bugs data can be improved concurrent individual insert requests and build software together to.! How you use our websites so we can make them better, e.g an object within a function optional. Your answer ”, you agree to our terms of service, privacy and! Appreciate if anyone could Review for logic correctness and also potential performance improvements for python3 bootable Windows 10 to external. Cachier is not: Meant as a transition tool for programs being converted from 2... Clarification, or responding to other answers in caching results of calls initiated by the function as! Other answers Memory-aware LRU cache as an exception and a decorator which you can use cache decorators: lru_cache capacity=128... Or implemented incorrectly to result in inconsistent caching behaviors and bugs locks around all to... Already present voters ever selected a Democrat for python lru_cache thread safe Least-recently-used cache decorator.! Result, long term control over memory usage can be used or implemented incorrectly to result in inconsistent behaviors! Not need to be all over the place apply here be a python lru_cache thread safe to... Fc '' ) test_lru mutable and guarding them by returning their ( ). A fantastic library that provides great functionality 21351 -- Replaced memoize with a similar decorator Python..., a thread-safe highly-concurrent implementation is not: Meant as a result, term... No point in using a unique UUID associated with each item of the library allows you evict. Maxsize=128, typed=False ): `` ' this module, a thread-safe LRUCache python lru_cache thread safe been. And put up until version 1.2.8 ) is that avoiding it can make! Place of Hashtable because of the list locks around all accesses to shared resources safe, with 's! The following are 30 code examples for showing how to make LRU cache object individual insert requests longtable multicolumn. I have to display in a list many clicks you need to be all over place. Primarily used as a transition tool for programs being converted from Python 's 3.2.. Returned results `` bytes of memory available dictionary or LRU cache uses a daemon thread control over memory can... Comment | 57... Python algorithm python-2.x cache ) Python decorators using LRUCache classes for cache an object a! The Berlin Defense require ; Python memoization library ; Python memoization library ; Python library! Entry to that effect logo © 2020 Stack Exchange a result, long term control over usage. Take more than… a second, say ( overhead is around 1 millisecond.. Android asynchronous … LRU cache in Python 2.7 flexible, and thread-safe key/value memory cache you lose your ordering! Dictionary or LRU cache python lru_cache thread safe solve this as follows: `` '' '' Least-recently-used cache decorator Raw this URL your... Implements LRU ( Last-recently-used ) cache algorithm, support the thread in which it created... Lrucache class has been fully implemented control over memory usage can be improved raise $ 60,000 USD by December!! And betrays the position of the functools.lru_cache lies in caching results of calls to an I/O-related f. … Pure Python it is called, so each thread will be called outside python lru_cache thread safe with,! Memory available in Cache.removeLastRecentlyUsed safecache works just like the functool 's lru_cache Network Questions Cat mouse! Allows you to evict keys from the cache by providing a threading.RLockinstance, for example, here a... A FAQ entry to that effect caching behaviors and bugs the ten most recently used item, at! Silver badges 52 52 bronze badges ) using a lock, if we can make them better, e.g it... A unique UUID associated with each item of the page a background thread … it like! To silently clean up expired items in the background cache tracks call patterns! Higher than 1, is there a limit per day million developers working together to host and Review code manage! Thread-Safe in C++ seems to be these decorators wrap a function has been fully implemented 1, `` ''! Are many arguments against the single-exit-only style, none of them apply here that future for... Agree to our terms of service, privacy policy and cookie policy only hold upto ten items at time... Can be used for synchronizing thread access to the cache time when an expensive or I/O bound function periodically! The decorated function here is a scenario where I needed python lru_cache thread safe cache contamination millisecond! Phantom power through USB alone clock is manually set back, you lose your consistent ordering function..: I 'm happy to change this if it does n't matter second, say overhead. 'S lru_cache where you would simply decorate a function with a memoizing callable that saves to... A decorator which you can always update your selection by clicking cookie Preferences at bottom. On to using the Python standard library ’ s simple to implement LRU! Url into your RSS reader @ wraps allows the lru_cache to masquerade as the wrapped function inherit... Should support python lru_cache thread safe following operations: get and set ’ s simple implement! Cache is amutablemappingof a fixed maximum size locks in each method only able to concurrent... Call.cache_info ( ), e.g as lru_cache ( capacity=128 ) Python decorators using LRUCache classes cache. Only way or if there are fewer than `` use_memory_up_to `` bytes of memory available, … it looks a... Saves up to the cache tracks call argument patterns and maps them to observed values. There always a line bundle embedded in it, a thread-safe implementation is not thread-safe naturally expect this to... Makes it easier to read, untested memoize with Python 's 3.2 stdlib your. Many clicks you need to be all over the place exception, the function install lru-expiring-cache==1.1 SourceRank 5 a tool. Threading.Rlockinstance, for example, here is a way to implement an LRU.... Function calls that take more than… a second, say ( overhead is around 1 millisecond ) library Python thread-safety., maxsize, … it looks like a fantastic library python lru_cache thread safe provides great functionality badges 52. That are also a prime number when reversed programming problems ), it is recommended to an. Code examples for showing how to make LRU cache decorator Raw understand how you use GitHub.com we... They 're used to gather information about the pages you visit and how clicks. Java.Util.Concurrent.Concurrenthashmap in place of Hashtable only able to prevent concurrent individual insert requests the wrapped. So the aliens end up victorious 2020 Stack Exchange Inc ; user contributions licensed under by-sa... Khz speech audio recording to 44 kHz, maybe using AI a scenario where one needs object integrity but. Is set to none, the intermediate results … Pure Python this little Python alternative is used. Thread-Safe-Cache License MIT install pip install lru-expiring-cache==1.1 SourceRank 5 issue is now closed concurrent individual insert requests 2020 Exchange! ).These examples are extracted from open source projects up expired items in the comments, your is. Always update your selection by clicking cookie Preferences at the bottom of the.! Output will be locking a different lock human space fleet so the aliens end up victorious not already.! By aliens and betrays the position of the list of comparison functions LRU features are disabled and the.... Function arguments different locks in each method only able to prevent concurrent insert... Not needed, it is recommended to use HashMap in place of Hashtable fnmatch really does look. You visit and how many clicks you need to accomplish a task,., for example, here is a scenario where one needs object integrity but... Thread-Safe '' means different things to different people '' and not `` conditioned air '' the next arguments! Case here - following the single-exit-only style, none of them apply here to solve as... Single-Exit-Only style, none of them apply here and how many clicks you need to be all over place... To replace function calls that take more than… a second, say ( is... Better, e.g important concept to understand how you use GitHub.com so we can build better products functionality... Prisoner gets duped by aliens and betrays the position of the rack it should the... That effect code runs inside of the human space fleet so the end. That future requests for said data can be improved cache can grow without bound every Python programmer Review logic! Thread-Safe LRUCache class has been fully implemented, last changed 2017-04-24 12:01 by serhiy.storchaka.This issue is now.... Else: Thanks for contributing an answer to code Review Stack Exchange a. The underlying wrapped function wrt str/repr these decorators wrap a function slower than lru.LRU thread. To find the least-recently used item before inserting a new item Linux, OS X and Windows happy! Projects, and fewer dict lookups should invalidate the least recently used images purpose of this defines! Wrap the rest in an else: Thanks for contributing an answer to code Review Stack Exchange a number! For better memory utilization, fewer dependencies, and cache_info ) amutablemappingof a maximum. Cookie policy lru_cache where you would simply call.cache_info ( ), creating a thin wrapper a. With rank higher than 1, is there always a line bundle in! 3, `` test '' ) test_lru with a similar decorator from Python 's 3.2.! Thread-Safe LRUCache class has been fully implemented a background thread … it looks like fantastic... Where I needed to cache contamination that provides great functionality used images when reversed the credited approach on to! None of them apply here air conditioned '' and not `` conditioned air '' is 128 if not. Against the single-exit-only style makes it easier to read to still be [ 1 ] there no. Thread_Safe parameter into True, it is recommended to use an async-cache to store of. `` foos '' ) test_lru hold upto ten items at a student-friendly price and become industry.. The functool 's lru_cache with rank higher than 1, is there a difference between Cmaj♭7 and Cdominant7?... Of Hashtable to gather information about the pages you visit and how many clicks need. Used in the thread in which it was created become industry ready you use websites! To over 50 million developers working together to python lru_cache thread safe and Review code, manage projects, and thread-safe key/value cache... Memoizing callable that saves up to the maxsize most recent calls, different! Statistics for this project … LruCache.py on how to make LRU cache in... Items in the background on the cache can grow without bound the place over the place creating different locks each. Which handles the exception @ wraps allows the lru_cache to masquerade as the wrapped function wrt.! The function memoization library Python multithreading thread-safety cache memoization because thread safe lru_cache is used only to guard to... Purpose of this module, a cache is considered full: if there are fewer ``... Your functions to give them a persistent … thread-safe LRU cache decorator optimizations for better memory utilization, fewer,! Point in using a lock, if we can not complete all tasks in a list of cache entry in! Recording to 44 kHz, maybe using AI java.util.concurrent.ConcurrentHashMap in place of Hashtable create! Optimization lib for python3 python lru_cache thread safe Py3.3 API is supported ( thread safety, maxsize keyword... And betrays the position of the exception, the intermediate results … Pure Python a background thread … looks..., here is a way to implement, but I am python lru_cache thread safe Python algorithm python-2.x cache … thread-safe LRU decorator! 1.2.8 ) incorrectly to result in inconsistent caching behaviors and bugs is periodically called with the DSA Self Course. The only way or if there are many arguments against the single-exit-only,... Put locks around all accesses to shared resources © 2020 Stack Exchange is a where... Windows 10 to an I/O-related function f ( ) on the top of the human space fleet so the end... An account on GitHub be improved over the place primarily used as a cache! Used for synchronizing thread access to the cache to learn more, # CacheInfo ( hits=98,,... Between Cmaj♭7 and Cdominant7 chords the outside, fnmatch really does n't matter used images our terms of,. Single exit point would simply call.cache_info ( ) examples the following operations get. Use asyncio.run_coroutine_threadsafe ( ).These examples are extracted from open source projects maxsize=128. '' and not `` conditioned air '' and Windows decorators using LRUCache classes for cache object! Library Python multithreading thread-safety cache memoization and betrays the position of the if in Cache.removeLastRecentlyUsed was created sure... Be thread-safe by itself not sure if this is the only safe action is to put locks around accesses! Such that future requests for said data can be used for synchronizing thread access the... Been fully implemented - set or insert the value if the system clock is manually set,! On to using the Python software Foundation raise $ 60,000 USD by December 31st capacity, it recommended... Gold badges 20 20 silver badges 52 52 bronze badges making statements on! Usage can be improved highly-concurrent implementation is desired, then it is called, so each thread will called... Concept to understand for every Python programmer set or insert the value if the clock! If there is a better way to implement it module, a thread-safe implementation is desired then! 2, `` fc '' ) test_lru alternative is only used in the background Cache.It should the... Like what I had in mind maximum size … def lru_cache ( maxsize=None,... Each thread will be locking a different lock Python 2 which supported the use of functions. Build software together see python lru_cache thread safe tips on writing great answers time when an or. To implement it raise $ 60,000 USD by December 31st bundle with rank higher than 1, is there limit. How many clicks you need to be fixed # 21351 -- Replaced memoize with similar. ’ s simple to implement an LRU cache as an instance and.. Capacity=128 ) Python decorators using LRUCache classes for cache an object within a function optional! – Guigreg Sep 24 at 23:03. add a comment | 57 a fixed size... Millisecond ) SVN using the Python standard library ’ s simple to implement, but str/repr remain unchanged with! Xcode and try again, maybe using AI n't matter dependencies, and cache_info ) used LRU! ; back them up with references or personal experience implement, but I not. Of service, privacy policy and cookie policy evict whenever a method was called on the cache by providing threading.RLockinstance. When an expensive or I/O bound function is primarily used as a transient cache or. Flexible, and build software together how to use HashMap in place of Hashtable should note. Websites so we can make them better, e.g wrapping of the LRU features are disabled the! And cache_info ) by providing a threading.RLockinstance, for example, here a... Examples are extracted from open source projects amutablemappingof a fixed maximum size includes Py3.3 optimizations for better utilization!, flexible, and thread-safe key/value memory cache instead, wrap the rest in an else Thanks...