caching

问题 I want to measure the speed of the cache (I asked a question about that), so I write this code: #include<cstdio> #include<ctime> #include<windows.h> const int mod = 100000007; volatile int f[100000007]; volatile int *p; int main() { FILE *f1; f1=fopen("CacheTest.txt","w"); for(int l=1;l<=100000;) { clock_t st,ed; st=clock(); int now=0; for(int i=0;i<mod;i++) { now+=l;//note:mod is a prime and that will traversal the array if (now>=mod) now-=mod; } ed=clock(); double extime=(double)(ed-st)

问题 I'm trying compare the performance of a windows program when the disk cache is in its best state (when all files needed for the program to run are in memory cache, I just run it multiple times to get this state), and when the cache is in its worst state, that is completely empty. The only way way I know to ensure that the cache is completely empty is by rebooting the computer, but this is not ideal since its takes too much time. Is there any way to do this without rebooting? I tried sync, but

问题 I can't get the max-age cache control to work properly, I have used expires_in that resulted in a "Cache-Control:max-age=86400, public, must-revalidate" header. But yet, the browser still sends the request to the server, at least it is defined as "304 not modified", meaning that the ETag/If-None-Match headers works properly. I have tested it with webrick on my localhost and on heroku, with chrome 45 and Safari. And no, my development tools are not opened, and the "disable cache" is not

问题 HTTP Response Header Name Value Delim Status: HTTP/1.1 200 OK Server: Apache Content-Type: image/jpeg Accept-Ranges: bytes Last-Modified: Wed, 16 Oct 2013 12:06:35 GMT Content-Length: 54556 Cache-Control: max-age=604800 Expires: Thu, 24 Oct 2013 09:32:54 GMT Date: Thu, 17 Oct 2013 09:32:54 GMT Connection: close When I run the application Once everything runs Fine and Yes images are cached for Application Life Time, But when I close application and Run again with WIFI off. Image do Not appear.

问题 I am working on a Spring-MVC application. After the profiler went through the backend, I noticed that getCurrentlyAuthenticatedUser() is an hotspot. For the reason I thought of using cache. Unfortunately it is not working. Once the user logs in, I am getting null user, even though the user is logged in. What is going wrong. Ofcourse when I remove the @Cacheable annotation and config from XML, everything works fine. Any help would be nice. PersonServiceImpl : @Service @Transactional public

问题 Test case: <script> console.log('request'); (new Image()).src = 'https://s3.amazonaws.com/mapbox-gl-js/tests/no-cache.png'; setInterval(function() { console.log('request'); (new Image()).src = 'https://s3.amazonaws.com/mapbox-gl-js/tests/no-cache.png'; }, 5000); </script> Neither Chrome nor Firefox make any network requests for no-cache.png beyond the first, despite it being served with Cache-Control: no-cache , indicating that user agents must revalidate cached content. A few questions here

问题 I have my existing Django web application that uses a MySQLDB without memcaching. I would like to implement memcaching to improve the responsiveness of this site. I see the instructions here. However, these instructions leave me with some unanswered question(s). Is this all I need to do to get memcache working after I setup the memcached server? Or do I need to alter any of my code outside of settings.py? Does Django nicely handle all the memcaching operations behind the scenes for me

问题 I have a Jquery web site that needed to be upgraded to provide Local Storage caching capability, Target was making every Ajax request checks first if there is a cached response HTML, then it will NOT call the server side, but gets data from cache instead. Everything going OK with caching and displaying data from cache and so on.. My problem appeared when applying my caching core to sites that heavily depending on XML HTTP Response Headers; It Appeared that when I try to cache the

问题 I currently using my own membership implementation on a ASP.MVC project. I've got an Account and an Account can have more than 1 memberships. I am not sure what is the best approach to follow with Account information being cached. I am currently loading the account information for almost each request from the User property of the controller. Should I cache the account information? And if where would be the best place, cookies or Session? 回答1: I recommend fairly strongly against sessions. They

问题 <?php $_SESSION['test']="demo"; echo $_SESSION['test']; function clearBrowserCache() { header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); header ("Cache-Control: no-cache, must-revalidate"); header ("Pragma: no-cache"); } clearBrowserCache(); ?> i want to make one php file which can clear cache browser. is that something wrong in my code please help me :) 回答1: You should not echo anything before sending headers. <?php function