clear_cache | clear cakephp caches with shell or within your app | Caching library

I sometimes have to write qmake pro file like this:

I have a website running Django 2.0 on AWS ElasticBeanstalk. I have a couple views on my website that take some time to calculate, so I thought I'd look into some simple caching. I decided on LocMemCache because it looked like the quickest to set up that would meet my needs. (I'm using AWS, so using Memcached apparently requires ElastiCache, which adds cost and is additional setup overhead that I wanted to avoid.)

The views do not change often, and the site is not high-traffic, so I put long timeouts on the caches. There are three views where I have enabled caching:

1. A report generated inside a template – uses Template Fragment caching
2. A list of locations requested by AJAX and used in a JS library – uses per-view caching
3. A dynamically-generated binary file download – uses per-view caching

The caching is set up and works great.

The data that goes into these views is added and edited by other staff at my company, that are used to their changes appearing immediately. So in order to address questions such as, "I updated this data, why has the webpage not updated?" I wanted to create a "Clear Server Cache" button, accessible by staff, to force a cache reset.

The button is set up and functioning. It requests a view that calls cache.clear() from django.core.cache. I used the sledgehammer cache.clear() approach because the way to specify an individual per-view cache in code seems to be a bit clunky and convoluted, so the "clear it all" approach seemed adequate. And at the very least it should always "work" in the sense that all the data will get re-loaded again.

When I use the button to call cache.clear(), it only clears the Template Fragment cache. It does not seem to clear the per-view caches. Why?

According to Django Documentation,

Be careful with this; clear() will remove everything from the cache, not just the keys set by your application.

So why is it not touching the per-view caches? Doesn't the warning seem to indicate that clear() is dangerous specifically because it's a sledgehammer and nothing at all is spared? What am I missing?

Does AWS use some kind of special memory that's immune to this sort of culling? (If this is the case, then why are the Template Fragments successfully cleared?) I did notice (and find it interesting) that the cache remains even after deploying a new image to the same environment.

I could switch to using Database caching, but I'd like to understand why this isn't working so I don't need to abandon LocMemCache as an option to ever use in the future.

I could also move the others to use Template Fragment caching, but if I ever expand the caching to fit other needs, I will want to be able to use per-view caching. Also, this solution would be less than ideal for a binary-file-download view.

Upgrading from Rails 5.2.3 to 6.0.0 or 6.0.1, with Ruby 2.6.3, after bundling succeeds, the rails app:update command has been carefully run, and webpacker updated, a request to any page that requires no authentication gives:

I want to execute the cap equivalent of

I have a Codeigniter 2.2 project. without no changing in the code my browser somehow holding cache for previous logged user. If i reload with clearing cache then it shows currently logged user.

I have added My_Output core controller. and added $this->output->clear_cache() in the logout function. I have also added

I have some property methods in a Class and I want to clear the cache of this property at some point.

Example :

Trying out the example in Section 5.9.2 Class monotonic_buffer_resource of the following article on Polymorphic Memory Resources by Pablo Halpern :

Doc No: N3816
Date: 2013-10-13
Author: Pablo Halpern
phalpern@halpernwightsoftware.com
Polymorphic Memory Resources - r1
(Originally N3525 – Polymorphic Allocators)

The article claims that :

The monotonic_buffer_resource class is designed for very fast memory allocations in situations where memory is used to build up a few objects and then is released all at once when those objects go out of scope.

and that :

A particularly good use for a monotonic_buffer_resource is to provide memory for a local variable of container or string type. For example, the following code concatenates two strings, looks for the word “hello” in the concatenated string, and then discards the concatenated string after the word is found or not found. The concatenated string is expected to be no more than 80 bytes long, so the code is optimized for these short strings using a small monotonic_buffer_resource [...]

I've benchmarked the example using the google benchmark library and boost.container 1.69's polymorphic resources, compiled and linked to release binaries with g++-8 on an Ubuntu 18.04 LTS hyper-v virtual machine with the following code :

Tried to replicate this code using fastai lib, but I'm running in two major issues.

1. This par of code:

   data_lm = TextLMDataBunch.from_df('data', train_df, valid_df, text_cols='idea')

Gives this kind of error:

I have a working site on GAE, and in order to keep it that way I'm trying to add some unit tests.

One of the first things I'd like is a basic smoke test that confirms an authenticated user can load the home page. Here's my attempt: