page-caching

问题 Background : in Java I'm memory mapping a file (shared). I'm writing some value at the address 0 of that file. I understand the corresponding PAGE in the PAGE CACHE is flagged as DIRTY and will be written later depending on the dirty_ratio and the like settings. So far so good. But I'm wondering what is happening when writing once more at the address 0 while the kernel is writing back the dirty page to the file. Is my process blocked somehow waiting for the writeback to be completed? 回答1: It

问题 Background : in Java I'm memory mapping a file (shared). I'm writing some value at the address 0 of that file. I understand the corresponding PAGE in the PAGE CACHE is flagged as DIRTY and will be written later depending on the dirty_ratio and the like settings. So far so good. But I'm wondering what is happening when writing once more at the address 0 while the kernel is writing back the dirty page to the file. Is my process blocked somehow waiting for the writeback to be completed? 回答1: It

问题 Is it possible to turn on page caching for a functional test? The following didn't work: class ArticlesControllerTest < ActionController::TestCase def setup ActionController::Base.public_class_method :page_cache_path ActionController::Base.perform_caching = true end end thanks in advance Deb 回答1: My current workaround is to enable perform_caching then reload the controller: class ProjectsCachingTest < ActionController::IntegrationTest def setup # force the controller to be reloaded when

问题 Using Rails 3.2 in development mode, I'm trying to test out some simple page caching. pages_controller.rb class PagesController < ActionController::Base caches_page :index, :show def index @pages = Page.all end def show @page = Page.find(params[:id]) end end development.rb config.action_controller.perform_caching = true application.rb config.action_controller.page_cache_directory = File.join(Rails.root, 'public') When I test this setup out, it seems to process these actions like normal, and

问题 I have my website cached using full page caching. So for every page an html file is created. As I am using CakePHP, I can define that APC caching would be used instead of file caching. However, if done that, html files are still being created (APC is installed correctly). So question: is there any logic in using APC with full page caching? Does it give any benefits? Is it possible to put cached html file to RAM somehow and read it from there when needed? P.S. I am not talking about APC opcode

问题 There is page cache before we write data to disk. So if I have two operations. write(fileA) write(fileB) Then if the system is suddenly shutdown. We don't initiative call the sync() call. I want to know if it is possible that the data we wrote to fileB has flush to the disk, while the data we wrote to fileA haven't been flush to the disk? 回答1: I believe that it is possible for fileB to be written to disk before fileA, as the writes will be bundled into block I/O requests and can be reordered

问题 I am using Memcached in my Ruby on Rails 3 app. It works great with action and fragment caching, but when I try to use page caching, the page is stored in the filesystem instead of in Memcached. How can I tell Rails to use Memcached for page caching too? In my development.rb file: config.action_controller.perform_caching = true config.cache_store = :mem_cache_store 回答1: You cant. The equivalent of page caching in memcached is action caching, because the request must be served through Rails.

问题 I have a page with the following caching defined: <%@ OutputCache Duration="60" VaryByParam="None" %> I have a user control inside that page that i don't want cached. How can I turn it off just for that control? 回答1: Option One Use the Substitution control or API on your page. this enables you to cache everything on your page except the part contained within the substitution control. http://msdn.microsoft.com/en-us/library/ms227429.aspx One nice way to use this is to implement your control as