caching

问题 I have built a website using flask (www.csppdb.com). Sometimes when I log in as one user, log out, then login as another user I still see pages from the first user I logged in as. This problem is immediately fixed when the page is refreshed. I think this is called "caching" if I am not mistaken. Is there any way I could disable this on a site wide level so that every page that is visited needs a new refresh? It would be like sharing your computer with a friend. He logs into Facebook, then

问题 Is it recommended that, when I need to access the result of a jQuery selector more than once in the scope of a function, that I run the selector once and assign it to a local variable? Forgive my trite example here, but i think it illustrates the question. So, will this code perform faster: var execute = function(){ var element = $('.myElement'); element.css('color','green'); element.attr('title','My Element'); element.click(function(){ console.log('clicked'); }); } than this code: var

问题 I'd like to add caching capabilities to my application using the System.Runtime.Caching namespace, and would probably want to use caching in several places and in different contexts. To do so, I want to use several MemoryCache instances. However, I see here that using more than one instance of MemoryCache is discouraged: MemoryCache is not a singleton, but you should create only a few or potentially only one MemoryCache instance and code that caches items should use those instances. How would

问题 I understand that the processor brings data into the cache via cache lines, which - for instance, on my Atom processor - brings in about 64 bytes at a time, whatever the size of the actual data being read. My question is: Imagine that you need to read one byte from memory, which 64 bytes will be brought into the cache? The two possibilities I can see is that, either the 64 bytes start at the closest 64 bytes boundary below the byte of interest, or the 64 bytes are spread around the byte in

问题 I am searching for a way, to cache images from the storage on google firebase platform. For now, I can download images, and show these to users, but I am not able to cache this, and access, even without internet connection. The database can be accessed offline. So I thought, there would be a way for storage too. I don't want to download every single image to storage, cause then I would need to check everytime, if the image is still up to date, it may be changed. Here are few links, what I

问题 I want to achieve the maximum bandwidth of the following operations with Intel processors. for(int i=0; i<n; i++) z[i] = x[i] + y[i]; //n=2048 where x, y, and z are float arrays. I am doing this on Haswell, Ivy Bridge , and Westmere systems. I originally allocated the memory like this char *a = (char*)_mm_malloc(sizeof(float)*n, 64); char *b = (char*)_mm_malloc(sizeof(float)*n, 64); char *c = (char*)_mm_malloc(sizeof(float)*n, 64); float *x = (float*)a; float *y = (float*)b; float *z = (float

问题 This is how we prevent caching of JS and CSS files by browsers. This seems slightly hacky.. is there a better way? <% //JSP code long ts = (new Date()).getTime(); //Used to prevent JS/CSS caching %> <link rel="stylesheet" type="text/css" media="screen" href="/css/management.css?<%=ts %>" /> <script type="text/javascript" src="/js/pm.init.js?<%=ts %>"></script> <script type="text/javascript" src="/js/pm.util.func.js?<%=ts %>"></script> Update: The reason we want to prevent caching is to ensure

问题 I am trying to write a unit test class which will have to use same query to fetch the results from database two times in same test method. But as Hibernate cache is enabled second time it is not actually hitting the database and simply fetching the results from cache. Can someone please answer how to disable caching in persistence.xml . I tried to disable by changing properties hibernate.cache.use.query_cache = false and hibernate.cache.use_second_level_cache = false . But It did not work.

问题 I've noticed that on some websites (including SO) the link to the CSS will look like: <link rel="stylesheet" href="http://sstatic.net/so/all.css?v=6638"> I would say its safe to assume that ?v=6638 tells the browser to load version 6638 of the css file. But can I do this on my websites and can I include different versions of my CSS file just by changing the numbers? 回答1: That loads all.css with a different query string so that if version 6637, for instance, is already cached on your machine,

问题 Installed MAMP on a new Macbook with PHP 5.5.3. Reload and refresh do nothing. Still nothing. Google around for a few minutes trying to find out what is wrong, come back and refresh. It works. What the heck? I went into php.ini and disabled all the new OPcache and set the default cache time to 0. Added headers to the document to force no caching. Still same problem. What the heck is going on here? The network tab is showing a HTTP 200 request, so any new HTML in the index.php file renders