This would not matter if your computer was filled with super-fast memory. But unfortunately that’s not the case and computer-memory looks something like this1: +———-+ | CPU | <<– Our beloved CPU, superfast and always hungry for more data. +———-+ |L1 – Cache| <<– ~4 CPU-cycles access latency (very fast), 2 loads/clock throughput +———-+ |L2 … Read more
The Codesnippet you showed makes the browser load the website everytime it accesses it, which is useful if you perform frequent updates, but still have a static page. <meta http-equiv=”Cache-Control” content=”no-cache, no-store, must-revalidate”/> <meta http-equiv=”Pragma” content=”no-cache”/> <meta http-equiv=”Expires” content=”0″/> In case you want it to perform live updates, like it does for example in a … Read more
If you’re using RewriteRule, just use R instead of R=301. For other purposes, you’ll have to clear your browser cache whenever you change a redirect. from https://stackoverflow.com/a/7749784/1066234
I don’t think the question is related to virtual memory management, but more about the expiration of the items in Redis, which is a totally different topic. Contrary to memcached, Redis is not only a cache. So the user is supposed to choose about the item eviction policy using various mechanisms. You can evict all … Read more
You can think Redis as a shared data structure, while Ehcache is a memory block storing serialized data objects. This is the main difference. Redis as a shared data structure means you can put some predefined data structure (such as String, List, Set etc) in one language and retrieve it in another language. This is … Read more
Cache coherence. When you scan horizontally, your data will be closer together in memory, so you will have less cache misses and thus performance will be faster. For a small enough rectangle, this won’t matter.
You’re probably going to want four loops – two to iterate over the blocks, and then another two to perform the transpose-copy of a single block. Assuming for simplicity a block size that divides the size of the matrix, something like this I think, although I’d want to draw some pictures on the backs of … Read more
Spatial and temporal locality describe two different characteristics of how programs access data (or instructions). Wikipedia has a good article on locality of reference. A sequence of references is said to have spatial locality if things that are referenced close in time are also close in space (nearby memory addresses, nearby sectors on a disk, … Read more