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• Windows 7 not booting after failed SRT (SSD caching) install

  - by david

  This is a fairly new computer, only about a month old. i7 2700k, z68 motherboard, with a 1.5tb WD black HD, and a 128gb crucial M4 ssd. I followed the instructions for setting up ssd caching, the SATA controller was set to RAID, I installed the intel software and enabled acceleration and it said everything went fine. But when I went to reboot, I received the lovely "Reboot and Select proper Boot device" error message. I checked the bios, and it was booting from the correct HD (I tried the only other option anyway just in case, it was the ~50 odd gb of unformatted space left on the SSD) AFter that I entered the raid until (ctrl-i at boot) and removed the acceleration and deleted the raid array (because it was being used as a cache this was non destructive) Still no boot. So I reinstalled win7 directly on the SSD, booted, and checked the HDD to make sure it hadn't been wiped. It hadn't, all the files were still there, including all the windows stuff. I backed up my data to an external drive just in case, but I'd really like to get this install booting again. I trawled the webs a bit, and have tried entering recovery mode and using the bootrec.exe and bootsect.exe to fix it, but to be honest I'm not sure what I'm doing with those. My question is basically: How do I make my harddrive bootable again?

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• Faster caching method

  - by pataroulis

  I have a service that provides HTML code which at some point it is not updated anymore. The code is always generated dynamically from a database with 10 million entries so each HTML code page rendering searches there for say 60 or 70 of those entries and then renders the page. So, for those expired pages, I want to use a caching system which will be VERY simple (like just enter a record with the rendered HTML and (if I need) remove it). I tried to do it file-based but the search for the existence of a file and then passing it through php to actually render it , seems like too much for what I want to do. I was thinking of doing it on mysql with a table with MEDIUMBLOBs (each page is around 100k). It would hold about 150000 such records (for now, at least). My question is: Would it be faster to let mysql do the lookup of the file and the passing to php or is the file-based approach faster? The lookup code for the file based version looks like this: $page = @file_get_contents(getCacheFilename($pageId)); if($page!=NULL) { echo $page; } else { renderAndCachePage($pageId); } which does one lookup whether it finds the file or not. The mysql table would just have an ID (the page id) and the blob entry. The disk of the system is a simple SATA raid 1 , the mysql daemon can grab up to 2.5GB of memory (i have a proxy running too, eating the rest of the 16GB of the machine. ) In general the disk is quite busy already. My not using PEAR cache, is because I think (please feel free to correct me on this) it adds overhead I do not need because the page rendering code is called about 2M times per day and I wouldn't want to go through the whole code each time (and yes, I have eaccelerator to cache the code too). Any pointer to what direction I should go, would be greatly welcome. Thanks!

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• Controlling ASP.NET output cache memory usage

  - by Josh Einstein

  I would like to use output caching with WCF Data Services and although there's nothing specifically built in to support caching, there is an OnStartProcessingRequest method that allows me to hook in and set the cacheability of the request using normal ASP.NET mechanisms. But I am worried about the worker process getting recycled due to excessive memory consumption if large responses are cached. Is there a way to specify an upper limit for the ASP.NET output cache so that if this limit is exceeded, items in the cache will be discarded? I've seen the caching configuration settings but I get the impression from the documentation that this is for explicit caching via the Cache object since there is a separate outputCacheSettings which has no memory-related attributes. Here's a code snippet from Scott Hanselman's post that shows how I'm setting the cacheability of the request. protected override void OnStartProcessingRequest(ProcessRequestArgs args) { base.OnStartProcessingRequest(args); //Cache for a minute based on querystring HttpContext context = HttpContext.Current; HttpCachePolicy c = HttpContext.Current.Response.Cache; c.SetCacheability(HttpCacheability.ServerAndPrivate); c.SetExpires(HttpContext.Current.Timestamp.AddSeconds(60)); c.VaryByHeaders["Accept"] = true; c.VaryByHeaders["Accept-Charset"] = true; c.VaryByHeaders["Accept-Encoding"] = true; c.VaryByParams["*"] = true; }

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• In search of a network file system with extended caching to speed up file access

  - by Brecht Machiels

  I'm running a small home server that stores my documents. The disks in this server are in a RAID 1 configuration (using Linux md) and it's also periodically being backup up to an external hard drive to make sure I don't lose them. However, I'm always accessing the files from other computers on the home network using an SMB share, and this results in a considerable speed penalty (especially when connected over WLAN). This is quite annoying when editing large files, such as digital camera RAWs, for example. I've been looking for a solution to this problem. It would have to offer some kind of local caching to speed up the file access. The client would preferably not keep a copy of all data on the server, as it consists of a very large collection of photographs, most of which I will not access frequently. Instead, it should only cache the accessed files and sync the changes back in the background. Ideally, it would also do some smart read-ahead (cache the files that are in the same directory as the currently opened file, for examples), but I suppose that's asking a bit much. Synchronization should be automatic (on file change). Conflicting file changes (at the same time on different clients) are unlikely to happen in my use case, but I would prefer if they are handled properly (notification to the user). I've come across the following options, so far: something similar to Dropbox. iFolder seems to be the only thing that comes close, but its reputation (stability) and requirements put me off. A distributed file system such as OpenAFS. I'm not sure this will speed up file access. It is probably overkill for what I need. Maybe NFS or even Samba offer these possibilities. I read a bit about Windows' Offline Files, but its operation seems limited (at least on Windows XP). As this is just for personal use, I'm not willing to spend a lot of money. A free solution would be preferred. Also, the server needs to run on Linux, and I need a client for at least Windows.

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• Output Caching with IIS7 - How To for an dynamic aspx page?

  - by Lieven Cardoen

  I have a RetrieveBlob.aspx that gets some query string variables and returns an asset. Eeach url corresponds to a unique asset. In the RetrieveBlob.aspx a Cache Profile is set. In Web.Config the profile looks like (under system.web tag: <caching> <outputCache enableOutputCache="true" /> <outputCacheSettings> <outputCacheProfiles> <add duration="14800" enabled="true" varyByParam="*" name="AssetCacheProfile" /> </outputCacheProfiles> </outputCacheSettings> </caching> Ok, this works fine. When I put a breakpoint in the code behind of RetrieveBlob.aspx, it gets triggered the first time, and all the other times not. Now, I throw away the Cache Profile and instead I'm having this in my Web.Config under System.WebServer: <caching> <profiles> <add extension=".swf" policy="CacheForTimePeriod" kernelCachePolicy="CacheForTimePeriod" duration="00:08:00" /> <add extension=".flv" policy="CacheForTimePeriod" kernelCachePolicy="CacheForTimePeriod" duration="00:08:00" /> <add extension=".gif" policy="CacheForTimePeriod" kernelCachePolicy="CacheForTimePeriod" duration="00:08:00" /> <add extension=".png" policy="CacheForTimePeriod" kernelCachePolicy="CacheForTimePeriod" duration="00:08:00" /> <add extension=".mp3" policy="CacheForTimePeriod" kernelCachePolicy="CacheForTimePeriod" duration="00:08:00" /> <add extension=".jpeg" policy="CacheForTimePeriod" kernelCachePolicy="CacheForTimePeriod" duration="00:08:00" /> <add extension=".jpg" policy="CacheForTimePeriod" kernelCachePolicy="CacheForTimePeriod" duration="00:08:00" /> </profiles> </caching> Now the caching doesn't work anymore. What am I doing wrong? Is it possible to configure under Caching tag of System.WebServer a Caching Profile for a Dynamic aspx page?

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• How can I configure apache to cache the images that it is serving? Right now it is giving headers t

  - by Tchalvak

  Serving up images that don't seem to cache There's a LAPP (postgresql instead of mysql) running over on http://ninjawars.net. I just recently noticed that images don't seem to be caching with any kind of good frequency as I was reloading a page with a few images on it here: http://www.ninjawars.net/attack_player.php Here is an example image (they're probably all being served exactly the same): http://www.ninjawars.net/images/characters/fighter.png Checking the header, it seems that the caching is set to: Cache-Control:max-age=0 (the full header for this image-like-all-the-others is... Request URL:http://www.ninjawars.net/images/characters/fighter.png Request Method:GET Status Code:200 OK Request Headers Accept:application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,/;q=0.5 Cache-Control:max-age=0 Referer:http://www.ninjawars.net/images/characters/fighter.png User-Agent:Mozilla/5.0 (X11; U; Linux x86_64; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.3 Safari/533.4 Response Headers Accept-Ranges:bytes Content-Length:938 Content-Type:image/png Date:Thu, 13 May 2010 21:24:07 GMT ETag:"ffd4d-3aa-4837efc120540" Last-Modified:Mon, 05 Apr 2010 15:28:45 GMT Server:Apache ) So what modules or config or htaccess or whatever do I change to have it cache images, e.g. for 24 hours?

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• APC (php accelerator). What situations should I use this?

  - by matthewsteiner

  So I've just got a small vps. I've installed apc, which sped up normal pages by 20% - 30%. I was reading about memcached and came to the conclusion that I can use apc for the same thing (caching objects from database results) if I'm not distributing over other servers. Since I only have the one server, apc will be just as beneficial for caching things in memory. I'm still in development mode, and I'm sure it's hard to tell what would be best for production mode. The thing is, my database queries seem pretty fast (between .0008 and .02). None of my pages are way database intensive. Would it be beneficial to me to cache results in memory? If the database is running well right now, is it going to be having a hard time later? Also, is connecting to the database at all something that costs speed (even if I cache most of my queries, every page has to have a little database interaction for session data). So, basically if I have a limited ram, and one machine, will using apc rather than just letting the database be uncached be much faster? Ideas?

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• Squid not caching files (Randomly)

  - by Heinrich

  I want to use an intercepting squid server to cache specific large zip files that users in my network download frequently. I have configured squid on a gateway machine and caching is working for "static" zip files that are served from an Apache web server outside our network. The files that I want to have cached by squid are zip files 100MB which are served from a heroku-hosted Rails application. I set an ETag header (SHA hash of the zip file on the server) and Cache-Control: public header. However, these files are not cached by squid. This, for example, is a request that is not cached: $ curl --no-keepalive -v -o test.zip --header "X-Access-Key: 20767ed397afdea90601fda4513ceb042fe6ab4e51578da63d3bc9b024ed538a" --header "X-Customer: 5" "http://MY_APP.herokuapp.com/api/device/v1/media/download?version=latest" * Adding handle: conn: 0x7ffd4a804400 * Adding handle: send: 0 * Adding handle: recv: 0 ... > GET /api/device/v1/media/download?version=latest HTTP/1.1 > User-Agent: curl/7.30.0 > Host: MY_APP.herokuapp.com > Accept: */* > X-Access-Key: 20767ed397afdea90601fda4513ceb042fe6ab4e51578da63d3bc9b024ed538a > X-Customer: 5 > 0 0 0 0 0 0 0 0 --:--:-- 0:00:09 --:--:-- 0< HTTP/1.1 200 OK * Server Cowboy is not blacklisted < Server: Cowboy < Date: Mon, 18 Aug 2014 14:13:27 GMT < Status: 200 OK < X-Frame-Options: SAMEORIGIN < X-Xss-Protection: 1; mode=block < X-Content-Type-Options: nosniff < ETag: "95e888938c0d539b8dd74139beace67f" < Content-Disposition: attachment; filename="e7cce850ae728b81fe3f315d21a560af.zip" < Content-Transfer-Encoding: binary < Content-Length: 125727431 < Content-Type: application/zip < Cache-Control: public < X-Request-Id: 7ce6edb0-013a-4003-a331-94d2b8fae8ad < X-Runtime: 1.244251 < X-Cache: MISS from AAA.fritz.box < Via: 1.1 vegur, 1.1 AAA.fritz.box (squid/3.3.11) < Connection: keep-alive In the logs squid is reporting a TCP_MISS. This is the relevant excerpt from my squid file: # Squid normally listens to port 3128 http_port 3128 http_port 3129 intercept # Uncomment and adjust the following to add a disk cache directory. maximum_object_size 1000 MB maximum_object_size_in_memory 1000 MB cache_dir ufs /usr/local/var/cache/squid 10000 16 256 cache_mem 2000 MB # Leave coredumps in the first cache dir coredump_dir /usr/local/var/cache/squid cache_store_log daemon:/usr/local/var/logs/cache_store.log #refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern -i .(zip) 525600 100% 525600 override-expire ignore-no-cache ignore-no-store refresh_pattern . 0 20% 4320 ## DNS Configuration dns_nameservers 8.8.8.8 8.8.4.4 After trying around for some time I realized that squid is sometimes deciding that my file is cacheable, sometimes not, depending on whether and when I enable/disable the dns_nameservers directive. What could be wrong here?

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• How do I reduce number of redundant requests with mod_perl properly?

  - by rassie

  In a fairly big legacy project, I've refactored several hairy modules into Moose classes. Each of these modules requires database access to (lazy) fetch its attributes. Since those objects are used pretty heavily, I want to reduce the number of redundant requests, for example for unchanged data. Now, how do I do that properly? I've got several alternatives: Implement caching in my Moose classes via a role to store them in memcached with expiration of 5-10 minutes (probably not too difficult, but tricky with lazy attributes) update: KiokuDB could probably help here, have to read up about attributes Migrate to DBIx::Class (needs to be done anyway) and implement caching on this level (DBIC will probably take most of the pain away just by itself) Somehow make my objects persist inside the mod_perl process (no clue how to do this :() How would you do this and what do you consider a sane way? Is caching data preferred on object or the ORM level?

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• default caching time when using hibernate

  - by cometta

  when using hibernate 2nd level cache and query cache and not specifying anything inside ehcache.xml .what is the default caching time?

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• AutoComplete and VS2010 Internal WebDevServer caching ?

  - by Renshai

  Ok this is a simple setup: DB has a view with personnel who have not been added to the system. The AutoComplete dynamically lists a numeric column field from the view. (Using Linq2SQL) (with autotracking off) Once this number is consumed - a refresh is done on the sqlserver's view. The Problem: This number still shows up in the Autocomplete UNTIL the VS WebDev Server is closed. Question: Why is the WebDev caching the data? I have tried turning off viewstate of the textbox, turned off caching on the autocompleteextender, to no avail. Any help please ...

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• Caching asp.net viewdata

  - by Tomh

  Hey guys, I'm currently thinking about caching most of my viewdata excpt user specific data after a user logs on. I thought the simplest way was caching the ViewData object itself and adding the user specific data after it was loaded. Are there any downsides of this approach? Are there better ways? string cacheKey = "Nieuws/show/" + id; if (HttpRuntime.Cache[cacheKey] != null) { ViewData = HttpRuntime.Cache[cacheKey] as ViewDataDictionary; } else { // add stuff to view data HttpRuntime.Cache.Insert(cacheKey, ViewData, null, DateTime.Now.AddSeconds(180), Cache.NoSlidingExpiration, CacheItemPriority.NotRemovable, null); }

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• Observer not clearing cache in Rails 2.3.2 - please help.

  - by Jason

  Hi, We are using Rails 2.3.2, Ruby 1.8 & memcache. In my Posts controller I have: cache_sweeper Company::Caching::Sweepers::PostSweeper, :only => [:save_post] I have created the following module: module Company module Caching module Sweepers class PostSweeper < ActionController::Caching::Sweeper observe Post def after_save(post) Rails.cache.delete("post_" + post.permalink) end end end end end but when the save_post method is invoked, the cache is never deleted. Just hoping someone can see what I am doing wrong here. Thanks.

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• Should I go with Varnish instead of nginx?

  - by gotts

  I really like nginx. But recently I've found that varnish gives you an opportunity to implement smart caching revers proxy layer(with URL purging). I have a cluster of mongrels which are pretty resource-intensive so if this caching layer can remove some load from mongrels this can be a great thing. I didn't find a way to implement the caching layer(with for application pages; static content is cacheable of course) same with nginx.. Should I use Varnish instead? What would you recommend?

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• WCF caching like it was with WebServices

  - by msony

  Does anybody know if WCF support kind of caching like it was with Web Services or should i implement it manually?

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• Pre-cache site as user visits

  - by strager

  I am making a static site which is 'forced' to be cached via Cache-control, etc. When a user visits my site, I want the browser to crawl my site, caching pages, so when the user navigates to a page, the load is almost instant. (I do not need a recursive crawl, as that will probably happen as the user navigates between pages. I just need to crawl the links on the current page, and of course not re-caching a page which has already been cached.) (Also, I am not changing pages using Ajax-like techniques. These are essentially normal flat HTML files with normal links.) How can I do this pre-caching using Javascript? (I am using jQuery.)

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• Updates to Wordpress theme template/stylesheet are not reflected when a file is edited

  - by Bryan

  I am developing a theme in Wordpress. I have an issue where updates to my stylesheet (style.css) are not being reflected in the browser after FTPing a new version of the file to the server. Edits will only show up in the browser after waiting a long time, (15+ minutes). I have tried all the things mentioned here, which have not worked. These include: Making sure no caching plugins are installed in Wordpress Clearing the browser cache Trying from a different browser Making sure I am editing and accessing the correct file Checking webhost configuration panel for a caching plugin Something seems to be caching the stylesheet but I'm not sure how this might be so.

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• What would prevent ASP.NET from Output Caching?

  - by amarsuperstar

  I have an ASP.NET application, and am trying to output cache a certain page, however on every request, the debugger is still hitting the OnLoad method and I get a 200 response back. I have placed the output cache directive on a page like so: <%@ OutputCache Duration="60" VaryByParam="None" %> And ensured I have the OutputCache module <add name="OutputCache" type="System.Web.Caching.OutputCacheModule"/> And have also bypassed URL rewriting just in case. I have tried this using Cassini and IIS 5.1 (XP), however the page is not caching at all. Are there any other factors which I have not looked at which could affect this feature? Thanks

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• PeerApp Scalability

  - by ChaosFreak

  William, In response to a question on P2P caching, you answered "PeerApp can do that but probably doesn't suit the scale you are looking at." PeerApp is the most scalable P2P cache in the world, and can handle hundreds of Gb per second of bandwidth. Their largest deployment in Taiwan handles 120Gbps with no problem. The next largest competitor, OverSi, can barely handle a tenth of that. Where do you get your information that PeerApp "doesn't suit scale"?

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• how to set httpheaders in asp.net mvc

  - by Gidon

  I need to set http header for disabling ie (7-8) caching (it disturbs my ajax functionallity). I've tried inserting this code to the head of my site.master with no result - <META HTTP-EQUIV="Pragma" CONTENT="no-cache"> <META HTTP-EQUIV="Expires" CONTENT="-1"> How and where can I set the HTTP headers? or do you have a better solution for the ie caching issue. regards.

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• Cache aspx page returning an asset on client?

  - by Lieven Cardoen

  How do you cache an aspx page call on the client? The aspx page returns an asset and looks like this: http://srv-edu-build/edumatic3/dev/RetrieveBlob.aspx?assetId=31809&assetFileId=9823 We have tried with Output Cache, with caching in the code behind, but the only result we get is server side caching (by IIS7). In the header of the response cache-control is set to public and expiration time is set (to 14800 as set in output cache profile).

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• While within a switch block

  - by rursw1

  Hi, I've seen the following code, taken from the libb64 project. I'm trying to understand what is the purpose of the while loop within the switch block - switch (state_in->step) { while (1) { case step_a: do { if (codechar == code_in+length_in) { state_in->step = step_a; state_in->plainchar = *plainchar; return plainchar - plaintext_out; } fragment = (char)base64_decode_value(*codechar++); } while (fragment < 0); *plainchar = (fragment & 0x03f) << 2; case step_b: do { if (codechar == code_in+length_in) { state_in->step = step_b; state_in->plainchar = *plainchar; return plainchar - plaintext_out; } fragment = (char)base64_decode_value(*codechar++); } while (fragment < 0); *plainchar++ |= (fragment & 0x030) >> 4; *plainchar = (fragment & 0x00f) << 4; case step_c: do { if (codechar == code_in+length_in) { state_in->step = step_c; state_in->plainchar = *plainchar; return plainchar - plaintext_out; } fragment = (char)base64_decode_value(*codechar++); } while (fragment < 0); *plainchar++ |= (fragment & 0x03c) >> 2; *plainchar = (fragment & 0x003) << 6; case step_d: do { if (codechar == code_in+length_in) { state_in->step = step_d; state_in->plainchar = *plainchar; return plainchar - plaintext_out; } fragment = (char)base64_decode_value(*codechar++); } while (fragment < 0); *plainchar++ |= (fragment & 0x03f); } } What can give the while? It seems that anyway, always the switch will perform only one of the cases. Did I miss something? Thanks.

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• How to disable activerecord cache logging in rails

  - by user1508459

  I'm trying to disable logging of caching in production. Have succeeded in getting SQL to stop logging queries, but no luck with caching log entries. Example line in production log: CACHE (0.0ms) SELECT merchants.* FROM merchants WHERE merchants.id = 1 LIMIT 1 I do not want to disable all logging, since I want logger.debug statements to show up in the production log. Using rails 3.2.1 with Mysql and Apache. Any suggestions?

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• How to do directional per fragment lighting in world space?

  - by user

  I am attempting to create a GLSL shader for simple, per-fragment directional light. So far, after following many tutorials, I have continually ran into the issue: my light is specified in world coordinates, however, the shader treats the light's position as being in eye space, thus, the light direction changes when I move the camera. My question is, how to I transform a directional light position such as (50, 50, 50, 0) into eye space, or, would doing things this way be the incorrect approach to the problem?

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• 'Microsoft.Practices.EnterpriseLibrary.Caching.CacheFactory' threw an exception

  - by user281180

  Hi I`m having the error message: The type initializer for 'Microsoft.Practices.EnterpriseLibrary.Caching.CacheFactory' threw an exception. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Practices.ObjectBuilder2, Version=2.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. Source Error: Line 30: private static ICacheManager GetCacheManager() Line 31: { Line 32: return CacheFactory.GetCacheManager(cacheManagerName); Line 33: } Line 34: } Source File: C:\Dev\DEV\HotHouse\HotHousetest3_rtmClone107\Code\MvcUI\State\PersistentCache.cs Line: 32 Assembly Load Trace: The following information can be helpful to determine why the assembly 'Microsoft.Practices.ObjectBuilder2, Version=2.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' could not be loaded. , whereas my colleages using the same dll, are not having the error message. Help please. I have Microsoft.Practices.EnterpriseLibrary.Caching and Microsoft.Practices.EnterpriseLibrary.Common as references both version 4.1.0.0 and runtime version v2.0.50727.

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