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Is cache invalidation promised in this implementation


Is cache invalidation promised in this implementation

By : EILrichard
Date : November 22 2020, 04:01 AM
wish helps you The C standard knows nothing of cache memories. They are an application-specific detail outside the scope of the C language.
The volatile keyword is only concerned with optimizations performed by the compiler. The compiler needs to ensure that operations on volatile-qualified variables are sequenced in a certain order and not optimized away.
code :


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Couchbase as a cache and cache invalidation

Couchbase as a cache and cache invalidation


By : Глеб Давыдов
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I use Couchbase 2.2 in production as a persistent cache layer and really happy with it (running about 2M documents). My app getting really fast gets (1 millisecond). Your idea is valid and I don't see anything wrong with using Couchbase as a entity storage for invalidation. Its a mature and very stable product.
You are correct in your entity design. You can have a main json doc that has list of references to other child documents. So that before deleting main document you will delete all children first.
Understanding Cache line invalidation and striped locks for Concurrent HashMap Implementation

Understanding Cache line invalidation and striped locks for Concurrent HashMap Implementation


By : Sonu Mehrok
Date : March 29 2020, 07:55 AM
wish help you to fix your issue To start with a non-concurrent hashmap, the basic principle is this:
Have a indexed structure (most often an array or set of arrays) for the keys and values. Get a hash for the key. Reduce this to be within the size of the arrays. (Modulo does this simply enough, so if the hash value is 123439281 and there are 31 slots available, then we use 123439281 % 31 which is 9 and use that as our index). See if there's a key there, and if so if it matches (equals). Store the key if it's new, and the value.
Cache invalidation in Symfony 3.1 cache component

Cache invalidation in Symfony 3.1 cache component


By : Danja
Date : March 29 2020, 07:55 AM
this will help I've found a solution : ConfigCache. You can give it an array of resources to watch and it will check their last modification time each time the cache is read.
The example above becomes something like :
code :
<?php
class MetadataCacheFactory implements MetadataCacheFactoryInterface
{
    const CACHE_NAMESPACE = 'my_namespace';

    /** @var \Symfony\Component\HttpKernel\KernelInterface */
    protected $kernel;

    public function __construct(KernelInterface $kernel)
    {
        $this->kernel = $kernel;
    }

    /**
     * {@inheritdoc}
     */
    public function create(): ConfigCache
    {
        return new ConfigCache($this->kernel->getCacheDir().'/'.self::CACHE_NAMESPACE, $this->kernel->isDebug());
    }
}
<?php
class ExampleMetadataFactory implements MetadataFactoryInterface
{
    const CACHE_KEY = 'example_metadata';

    [...]

    /** @var ExampleMetadata */
    protected $metadata;

    public function __construct(MetadataCacheFactoryInterface $cacheFactory)
    {
        $this->cache = $cacheFactory->create();
        $this->metadata = null;
    }

    /**
     * {@inheritdoc}
     */
    public function create(): ExampleMetadata
    {
        if ($this->metadata !== null) {
            return $this->metadata;
        }
        try {
            if ($this->cache->isFresh()) {
                $this->metadata = unserialize(file_get_contents($this->cache->getPath()));
                return $this->metadata;
            }
        } catch (CacheException $e) {
            // Ignore
        }
        $resources = [];
        $this->metadata = $this->createMetadata($resources);
        $this->cache->write(serialize($this->metadata), $resources);
        return $this->metadata;
    }

    /**
     * Creates the metadata.
     *
     * @param array $resources
     *
     * @return ExampleMetadata
     */
    protected function createMetadata(&$resources): ExampleMetadata
    {
        $metadata = new ExampleMetadata();
        $resourcesCollection = $this->resourcesCollectionFactory->create();
        foreach ($resourcesCollection as $resourceClass => $resourcePath) {
            // The important part, it's an instance of \Symfony\Component\Config\Resource\FileResource.
            $resources[] = new FileResource($resourcePath);
            $resourceMetadata = $this->resourceMetadataFactory->create($resourceClass);
            $metadata->registerResourceMetadata($resourceMetadata);
        }
        return $metadata;
    }
}
Google cloud CDN pricing details on cache data size and automatic cache invalidation

Google cloud CDN pricing details on cache data size and automatic cache invalidation


By : FiFi
Date : March 29 2020, 07:55 AM
I hope this helps . You'll be charged for cache fill when something is inserted into cache, but there is no charge for ongoing storage space used. There's also no charge for evictions. cloud.google.com/cdn/pricing lists what Cloud CDN charges for:
Cache egress Cache fill Cache lookup requests Cache invalidation
How to try cache invalidation and cache clean in ARM?

How to try cache invalidation and cache clean in ARM?


By : Mansi Upadhyaya
Date : March 29 2020, 07:55 AM
it should still fix some issue For the Raspberry Pi's ARM1176, cache maintenance is performed via the c7 group of System Control Coprocessor (CP15) operations. Data cache clean+invalidate is mcr p15, 0, r0, c7, c14, 0, and the Cache Dirty Status Register (which simply tells you if the cache is clean or has been written to) can be read with mrc p15, 0, , c7, c10, 6.
There's too much information to regurgitate here, so I'd recommend referring to the TRM for the details - if the Raspberry Pi TRM doesn't cover it, you can find the full ARM1176 TRM here (which contains a few example code snippets). As always, the Linux source also provides a handy real-world usage reference.
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