lru-cache | A cache that holds a limited number of key-value pairs | Caching library
kandi X-RAY | lru-cache Summary
kandi X-RAY | lru-cache Summary
It works fine, but will generally no longer be improved.
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lru-cache Key Features
lru-cache Examples and Code Snippets
def decorator(
cls, size: int = 128
) -> Callable[[Callable[[T], U]], Callable[..., U]]:
"""
Decorator version of LRU Cache
Decorated function must be function of T -> U
"""
def cache_decora
public static void main(String[] args) {
LRUCache lRUCache = new LRUCache(2);
lRUCache.put(1, 1); // cache is {1=1}
lRUCache.put(2, 2); // cache is {1=1, 2=2}
System.out.println(lRUCache.get(1)); // return 1
Community Discussions
Trending Discussions on lru-cache
QUESTION
error lru-cache@7.7.3: The engine "node" is incompatible with this module. Expected version ">=12". Got "10.15.1" error Found incompatible module
...ANSWER
Answered 2022-Apr-07 at 14:17Have you tried updating the node? U need to update to a higher version of node (v12) probably.
You can download the latest stable node from here - https://nodejs.org/en/download/ Or can use NVM (node version manager)
QUESTION
I am not able to install any npm packages as I get the following error on my M1 Mac mini
...ANSWER
Answered 2022-Mar-23 at 18:30import sys; print "%s.%s.%s"
That's some good old Python 2 notation if I ever saw some :)
As @ElapsedSoul mentioned. macOS 12.3 removed the Python 2 that came by default for all these years. Therefore, I would personally recommend for others not to upgrade to 12.3 if you need Python 2 until you find an alternative solution.
Some possible alternatives include the following:
Option 0: Reinstall Python 2 via HomebrewHomebrew unfortunately got rid of Python 2 a long time ago. There are however some workarounds to try and get it to work: How to reinstall python@2 from Homebrew?.
Option 1: Use pyenvI haven't tested this, so it might not work. But if it does, this is likely the best solution for your needs. From the following:
QUESTION
I am trying to set up my first Gatsby website. After running npm install -g gatsby-cli
, I do gatsby new gatsby-starter-hello-world https://github.com/gatsbyjs/gatsby-starter-hello-world
(just like the website https://www.gatsbyjs.com/starters/gatsbyjs/gatsby-starter-hello-world/ says) to download the hello world starter. When I run gatsby develop
I see the following error
ANSWER
Answered 2022-Mar-21 at 06:34As has been commented in the comments section, the issue has been solved by moving the project folder outside the OneDrive directory.
Because it's a synchronized cloud folder, as soon as you install/add/delete/update anything, it's being updated in the OneDrive cloud so the file/folder it's being used in the background and potentially unreachable. If at this time you try to develop the project (gatsby develop
or gatsby build
) and the file is being used, you won't be able to run it.
I don't think it's a good practice to use a cloud folder because the amount of data synchronized (mainly because of the node_modules
) it's something to care about (it's also ignored in the .gitignore
for a reason) so moving it to any other folder outside the OneDrive directory should be enough to run your project because the rest of global dependencies, according to your logs, were successfully installed.
QUESTION
I'm trying to compile my Rust code on my M1 Mac for a x86_64 target with linux. I use Docker to achieve that.
My Dockerfile:
...ANSWER
Answered 2022-Jan-18 at 17:25It looks like the executable is actually named x86_64-linux-gnu-gcc
, see https://packages.debian.org/bullseye/arm64/gcc-x86-64-linux-gnu/filelist.
QUESTION
Recently I came across functools.cache
and didn't know how it differs from functools.lru_cache
.
I found posts about the difference between functools.cached_property
and lru_cache
but nothing specifically for cache
and lru_cache
.
ANSWER
Answered 2021-Dec-10 at 08:10functools.cache
was newly added in version 3.9.
The documentation states:
Simple lightweight unbounded function cache. Sometimes called “memoize”.
Returns the same as
lru_cache(maxsize=None)
, creating a thin wrapper around a dictionary lookup for the function arguments. Because it never needs to evict old values, this is smaller and faster thanlru_cache()
with a size limit.
Example from the docs:
QUESTION
I'm trying to create a bundle of a nodeJS app within a yarn monorepo.
Compiling Typescript to JS works fine (through tsc), then rollup finishes too. However, when running the compiled bundle in node, I'm getting the following exception that points to that the external module cannot be found:
...ANSWER
Answered 2021-Nov-17 at 23:07The issue was that tsconfig.json
must use "module": "esnext"
. Otherwise the compiled code is not compatible.
QUESTION
I am trying to program a Discord Bot that plays music from Youtube. I chose Sodium as the encryption package, but I'm having difficulties when it comes to installing it.
I tried setting my VS version to 2015 by installing the required build tools and setting the version from the npm config, with no avail:
...ANSWER
Answered 2021-Aug-30 at 20:3476 error gyp ERR! find VS msvs_version was set from command line or npm config
76 error gyp ERR! find VS - looking for Visual Studio version 2015
76 error gyp ERR! find VS VCINSTALLDIR not set, not running in VS Command Prompt
76 error gyp ERR! find VS checking VS2017 (15.9.28307.1622) found at:
76 error gyp ERR! find VS "C:\Program Files (x86)\Microsoft Visual Studio\2017\BuildTools"
76 error gyp ERR! find VS - found "Visual Studio C++ core features"
76 error gyp ERR! find VS - found VC++ toolset: v141
76 error gyp ERR! find VS - found Windows SDK: 10.0.17763.0
76 error gyp ERR! find VS - msvs_version does not match this version
76 error gyp ERR! find VS could not find a version of Visual Studio 2017 or newer to use
76 error gyp ERR! find VS looking for Visual Studio 2015
76 error gyp ERR! find VS - not found
76 error gyp ERR! find VS not looking for VS2013 as it is only supported up to Node.js 8
76 error gyp ERR! find VS
76 error gyp ERR! find VS valid versions for msvs_version:
76 error gyp ERR! find VS - "2017"
QUESTION
In an attempt to profile & optimize a caching algorithm, I got stuck at something I don't understand.
Here is the hot-spot of the perf's report (in Ubuntu 18.04 LTS and g++ 7.5):
How does just a "mov" operatiaon between rax and rdx registers cause ~30% of total run-time of program? It's not a register-heavy program (an LRU-cache approximation algorithm that is doing ~50million lookups per second at max and this is around 400MB/s throughput(and certainly not faster than RAM for bigger key-value pairs) which should not be related to register bandwidth at all)
Test system's CPU is FX8150 and has 1 channel memory attached with 9GB/s bandwidth which is way higher than this single-thread cache can achieve for just "int" key + "int" value pairs. So I guess it should be safe to leave RAM out of this problem. Also the mov instruction looks like a part of std::unordered_map's lookup operations. I know this CPU is old but not really ancient-old so perhaps compiler is not using the right instruction here due to some "support for old CPU" issue?
Source code to reproduce the hot-spot:
...ANSWER
Answered 2021-Oct-06 at 19:17That's not moving between rax
and rdx
.
That's indexing into an array pointed to by rax
by rdx
and putting the result in rax
. Probable L1 cache miss.
QUESTION
In Redis, using allkeys-lru
deletes the key no matter if it's an expire-set key or not.
Using TTL
, setting an expiration for the key, uses memory.
Quoting from Redis.io:
It is also worth noting that setting an expire to a key costs memory, so using a policy like allkeys-lru is more memory efficient since there is no need to set an expire for the key to be evicted under memory pressure.
- Is it really more efficient overall to NOT put a
TTL
on the key and letallkeys-lru
policy handle it? - Isn't there any tradeoffs in this situation? For example, does the
allkeys-lru
block the write action until it completes the expiration? That would make me use the TTL if this expiration is going to take long durations.
I would love to discuss about this. Thanks for everybody's input!
...ANSWER
Answered 2021-Aug-19 at 12:27allkeys-lru is triggered by Redis allocated memory limit. It's a safety feature to avoid crashing Redis entirely. If you rely on only allkeys-lru to cleanup your data then your Redis will run slower because any operation would have to be applied to a bigger DB. And your Redis DB will always be at max size.
Also it makes it harder to monitor your resources during your business growth.
Using TTL on your values is more a technical decision based on your use case. It gives you more control over which events you don't need anymore. TTL uses more memory because it has to store the TTL value for each record, makes sense.
For Redis-Streams, you can use the MAXLEN property to not grow your streams too much, specially when you don't need older data. This property is per stream so it will not increase Redis memory that much. Redis-streams are expired by stream(by key), not by record. So it's not possible to expire old records from Streams based on a TTL/record if you continuously receive new data.
Main conclusion: Use TTL and MAXLEN where possible to cleanup unnecessary data sooner so Redis will not need to do it all at once and you will have more control over your data and resources.
QUESTION
I am trying to import segmentation models and keras and i am getting an attribute error, i am using tensor flow version 2.5.0
...ANSWER
Answered 2021-Jul-02 at 05:33I have solved my issue by adding tf.compat.v1.enable_eager_execution()
to import and it works fine
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Vulnerabilities
No vulnerabilities reported
Install lru-cache
Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.
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