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• Recommended CPU upgrade for Dell Vostro 220 with Intel E7300 processor?

  - by Justin Grant

  I've got a Dell Vostro 220 with an E7300 processor (Intel Core 2 Duo @ 2.66Mhz, LGA775 socket) and I'm thinking about upgrading my processor so I can run Windows Server 2008 R2 with Hyper-V, which requires Hardware Virtualization support in the processor. Yes, I know this is underpowered for a server, I'm actually using it as a desktop machine but I'd like to use Hyper-V instead of Virtual Server (which I'm using now for running VMs). I'd like to keep the same motherboard and ideally the same CPU fan and RAM too. Any suggestions for a good, relatively cheap (under $200) processor upgrade?

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• If I exchange the CPU, must I reinstall the OSes? (swapping cpus from one *nix-like to another)

  - by dag729

  Hi, as suggested by the title, I want to change CPU: actually I have two computers, one with Ubuntu running on an AMD Athlon 64 dual core 5200+ and the other with FreeBSD running on an AMD Sempron single core LE-1250. I would like to swap (I am not sure that this is the correct term...) the CPUs from one computer to the other one, that is take the dual core from the ubuntu pc and put it inside the freebsd pc and viceversa. The mobo is the same. Do you think I will encounter problems?

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• Why does Tomcat try to use the cache when compilation failed?

  - by etheros

  For some reason, it appears Tomcat is trying to hit its compilation cache when compilation failed. For example, if I create a JSP containing nothing but Hello, <%=world%>!, predictably, I get an error: org.apache.jasper.JasperException: Unable to compile class for JSP. Subsequent requests however alternate between this and org.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to load class for JSP. Further, if I create a JSP containing Hello!, it of course works just fine. If I modify it contain Hello, <%=name%>!, the response alternates between the previously-mentioned compilation error, and the cached Hello!. What's going on?

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• Why is idle windows VM using so much CPU?

  - by Jeff Shattock

  I have 2 VMs running as guests on a KVM virtualization platform running on Ubuntu 10.04. One VM is an Ubuntu 10.04 system, the other is a Windows 7 system. When both machines are completely logged out, the Linux machine uses 1% CPU, the Windows one 45-50%, according to top. The graphs in virt-manager seem to back this up. Theres nothing installed on the Win7 image that would be running in the background; its as fresh as can be. Why is the Windows VM using so much more than the Linux VM, when both are logged out and idling?

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• How can I diagnose cache misses when using Apache as a reverse proxy?

  - by johnstok

  I have set up Apache 2.2 as a reverse proxy with the following configuration: # jBoss proxying ProxyRequests Off <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPass /foo http://localhost:9080/foo ProxyPassReverse /foo http://localhost:9080/foo ProxyPassReverseCookiePath /foo /foo # Reverse proxy caching CacheEnable disk /foo # Compression SetOutputFilter DEFLATE BrowserMatch ^Mozilla/4 gzip-only-text/html BrowserMatch ^Mozilla/4\.0[678] no-gzip BrowserMatch \bMSIE\s(7|8) !no-gzip !gzip-only-text/html DeflateCompressionLevel 9 Header append Vary User-Agent env=!dont-vary However, in a number of cases where I expect a cached response to be returned the request is sent through to the origin server at localhost:9080. Responses have a HTTP Vary header of 'Accept-Encoding,User-Agent' which is to be expected given the mod_deflate configuration. How can I determine why Apache is unable to serve a response from the cache?

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• Any way to get back Chrome's Dialog box for cache clearing instead of the new tab?

  - by Stuart P.

  As of today's release of chrome (Tuesday, March 8, 2011) on both Mac & PC the settings are now in a tab (chrome://settings/advanced), needless to say when you're clearing your cache very frequently (cmd-shift-delete on mac, cntl+shift+delete on PC) it's quite tedious going back and forth in tabs. The click & clean chrome extension doesn't have a mac counterpart (plus I like the keyboard much more than the mouse). I've searched and have yet to find a way to get a dialog box instead of the new tab.

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• If a change the CPU, must I reinstall the OS?

  - by dag729

  Hi, as suggested by the title, I want to change CPU: actually I have two computers, one with Ubuntu running on an AMD Athlon 64 dual core 5200+ and the other with FreeBSD running on an AMD Sempron single core LE-1250. I would like to swap (I am not sure that this is the correct term...) the CPUs from one computer to the other one, that is take the dual core from the ubuntu pc and put it inside the freebsd pc and viceversa. The mobo is the same. Do you think I will encounter problems?

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• So confused by these CPU Specs can someone please help me out? THanks!

  - by Kevin

  Intel® Core™ i7-640M (2.8~3.46GHz, 35W) w/4MB Cache - 2 Cores, 4 Threads - 2.5 GT/s SO i'm buying a new laptop, which i have not done in 6 years. So i am not familiar with any of these cpu specs. It was the highest option for intel for this laptop. So i am assuming it is somewhat fast. But i'd like to learn what these specs mean. Any help would be greatly appreciated. i am not really a computer guy but would love to learn about what I am buying. Thanks!

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• Tell the linux kernel to put a file in the disk cache?

  - by Rory

  Is there any command to for a file to be read in and loaded into the linux disk cache? This is on an up-to-date debian system. I know in the general case, it's better to let the linux kernel figure this out. But I have an edge case. I have a laptop that has an NFS director mounted, and i want to play a long video file, but I don't want to have a network problem interrupt the playnig. I know that (largeish) file will be read in it's entirety later on. I know that nothing else (really) will be running while playing this video. There is enough free memory to store this file. (I know I could just copy the file into a new tmpfs filesystem, but I'm curious if there's an even shorter way to do it)

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• How can I access cpu temperature readings using c#?

  - by Paul

  For a programming project I would like to access the temperature readings from my CPU and GPUs. I will be using C#. From various forums I get the impression that there is specific information and developer resources you need in order to access that information for various boards. I have a MSI NF750-G55 board. MSI's website does not have any of the information I am looking for. I tried their tech support and the rep I spoke with stated they do not have any such information. There must be a way to obtain that info. Any thoughts?

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• My CPU hits 100°C... Help me!

  - by JamesT

  The safe limit for processors is typically 50°C or so, but I have found that my CPU likes to do up to 100°C. I have got these readings from SpeedFan 4.42. I have a Intel Quad Core unclocked. I am using the standard intel fan with heatsink that came with the prossesor My case is a Cooler Master and I have two fans installed on the case. I took the side off to see if that helped. It lowered the temp be 3C. I don't really want to blow the processor and I don't know how to cool it down.

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• IP Helper service uses 50-60% CPU every 1 minute for 3-4 seconds on Windows 7

  - by Sarveshwar

  I have checked everything - all the processes in the process explorer. IP Helper service is causing CPU usage of over 50 % every 1 minute for 3-4 seconds then comes back to normal. In the task manager, the process is svchost.exe and the service is iphlpsvc. Here's the result of "ipconfig /all" command: ![alt text][1] [1]: From Snapshots Here's a screenshot of "netsh interface teredo show state" command: ![alt text][1] [1]: From Snapshots Please help me resolve this. Also utorrent is not showing the teredo address.

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• ubuntu is very slow

  - by johnny smithens

  Hello all. I am new with Ubuntu, and it is very slow(even in Ubuntu 2D). The performance is degraded for almost any task. I just reinstalled with amd64, and tried updating the Nvidia drivers with Nvidia Xserver. but it made no difference. This is the output of free -m: total used free shared buffers cached Mem: 3006 1318 1688 0 61 699 -/+ buffers/cache: 556 2449 Swap: 3064 0 3064 tl;dr - total: 3006, used: 1318 When I see the virtual console with Ctrl+Alt+F2, I see constantly: Assuming Drive Cache: write through; asking for cache data failed; It is very frustrating. Thanks in advance!

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• How to maximize Java resources for gaming?

  - by Keidax

  I notice that when I play Minecraft, my CPU usage is only around 15 to 20 percent, at most. Is it possible to force my computer to allocate as much RAM, CPU time, etc. to the game, in order to get the best experience possible? Or, is the low CPU usage due to limitations in the JVM or the game code itself? I have OptiFine installed, and I've already tried using renice to change the process priority and -Xmx to allocate more memory to Java. What else can I do?

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• Why is Thunderbird pegging a core at 100%?

  - by david6

  I have experienced 2-3 unexplained lockup over last 10 days. Today, I had a random lockup (no mouse, keyboard response, 100% CPU). But, when I finally switched (Ctrl-Alt-F1) to command line (it took several minutes) it told me that thunderbird-bin had locked a CPU. I ran this to resolve: pidof thunderbird-bin sudo kill #### However, after saving other work, I tried restarting Thunderbird. It went to 90%+ CPU, and within 20 seconds it locked again. Once I have more detail I will raise a bug (on Ubuntu Forums). Does anyone have any other suggestions, advice? UPDATE Thunderbird 13.0.1 is quite stable in safe mode. Still working to resolve ..

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• When and How is an image cached for an ASPX with ContentType = image/jpeg ?

  - by Aamir Hasan

   In asp.net you can cache your page. You can vary the output cache by the followingThe query string in an initial request (HTTP GET).Control values passed on postback (HTTP POST values).The HTTP headers passed with a request.The major version number of the browser making the request.      A custom string in the page. In that case, you create custom code in the Global.asax file to specify the page's caching behavior.Link: http://msdn2.microsoft.com/en-us/library/xadzbzd6(VS.80).aspxyou can set the output caching for your GetImage.aspx, so that you dont have to requery the database every image request ,but you must use varybyParam , so that you have a cached version for every parameters arrangement:set the output cache for your page like this :At top of ASPX page: <%@ OutputCache Duration="600" VaryByParam="ID,Height,Width" %>VaryByParam  attribute allows you to vary the cached output depending on the query string.Adding this will make your images cached for 600 seconds, so that if the image request within this period ,the cahed version will be returned

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• How to not cache a php file where a cachemanifest is beeing called?

  - by Volmar

  Hi, i'm building a iphone app with jqtouch and i use a cachemanifest to cache all the static files (images, css, javascript) to make it load faster. However the page uses php for the dynamic content and i don't want to cache that. So i'm generating the cachemanifest with this php-script(manifest.php): <?php header('Content-Type: text/cache-manifest'); echo "CACHE MANIFEST\n"; $hashes = ""; $lastFileWasDynamic = FALSE; $dir = new RecursiveDirectoryIterator("."); foreach(new RecursiveIteratorIterator($dir) as $file) { if ($file->IsFile() && $file != "./manifest.php" && substr($file->getFilename(), 0, 1) != ".") { if(preg_match('/.php$/', $file)) { if(!$lastFileWasDynamic) { echo "\n\nNETWORK:\n"; } $lastFileWasDynamic = TRUE; } else { if($lastFileWasDynamic) { echo "\n\nCACHE:\n"; $lastFileWasDynamic = FALSE; } } echo $file . "\n"; $hashes .= md5_file($file); } } echo "\nNETWORK:\nhttp://chart.apis.google.com/\n\n# Hash: " . md5($hashes) . "\n"; ?> This actually works really good except for one irritating thing: From what i read somewhere the file that calls the cachemanifest is automaticly included in the manifest and is beeing cached. Wich means that my start-page index.php, where i call the cachemanifest is beeing cached. This leads to very irritating problems. is there any way to deal with this or any smart workaround? The page is in the cachemanifest listed as NETWORK, but it looks like this is beeing overruled by the fact that the cachemanifest is called from the file.

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• I'm confused, how do I control cache so my clients can see website edits.

  - by Jared Christensen

  I host about 10 websites for clients. Every so often a client will ask for an update to their website. It may be a simple image change, new PDF or a simple text change. I make the change and then send them a link to the web page with the update. About an hour later I will get an email back from the client telling me they still see the old page. I will then explaining to them how to empty their browsers cache. What I'm trying to figure out is if there is a way I can tell their browser that I made an update to the website and that it should reload the page and update the cache. I thought about trying a meta tag but I read that they are not very reliable. Also I would still like the page to cache I just want to be able to clear it when I make an update. Is this possible? I'm an advanced front end web developer (HTML, CSS, Javascript) and know some PHP. Cache is just one of those things I don't really understand that well.

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• How do I choose what and when to cache data with ob_start rather than query the database?

  - by Tim Santeford

  I have a home page that has several independent dynamic parts. The parts consist of a list of recent news from the company, a site statistics panel, and the online status of certain employees. The recent news changes monthly, site statistics change daily, and online statuses change on a per minute bases. I would like to cache these panels so that the db is not hit on every page load. Is using ob_start() then ob_get_contents() to cache these parts to a file the correct way to do this or is there a better method in PHP5 for doing this? In asking this question I'm trying to answer these additional questions: How can I determine the correct approach for caching this data without doing extensive benchmarking? Does it make sense to cache these parts in different files and then join them together per requests or should I re-query the data and cache once per minute? I'm looking for a rule of thumb for planning pages and for situations where doing testing is not cost effective (The client is not paying enough for it I mean). Thanks!

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• I made an .htaccess template; is there anything else that should be added or changed?

  - by purpler

  # DEFAULTS ServerSignature Off AddDefaultCharset UTF-8 DefaultLanguage en-US SetEnv Europe/Belgrade SetEnv SERVER_ADMIN [email protected] # Rewrites RewriteEngine On RewriteBase / # Redirect to WWW RewriteCond %{HTTP_HOST} ^serpentineseo.com RewriteRule (.*) http://www.serpentineseo.com/$1 [R=301,L] # Cache media files <filesMatch "\.(gif|jpg|jpeg|png|ico|swf|js)$"> Header set Cache-Control "max-age=2592000, public" </filesMatch> <FilesMatch "\.(js|css|pdf|swf)$"> Header set Cache-Control "max-age=604800" </FilesMatch> <FilesMatch "\.(html|htm|txt)$"> Header set Cache-Control "max-age=600" </FilesMatch> # DONT CACHE <FilesMatch "\.(pl|php|cgi|spl|scgi|fcgi)$"> Header unset Cache-Control </FilesMatch> # Deny access to .htaccess <Files .htaccess> order allow,deny deny from all </Files>

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• How do you handle browser cache with login/logout?

  - by Julien

  To improve performances, I'd like to add a fairly long Cache-Control (up to 30 minutes) to each page since they do not change often. However, each page also displays the name of the user logged in (like this website). The problem is when the user logs in or logs out: the user name must change. How can I change the user name after each login/logout action while keeping a long Cache-Control? Here are the solutions I can think of: Ajax request (not cached) to retrieve and display the user name. If I have 2 requests (/user?registered and /user?new), they could be cached as well. But I am afraid this extra request would nullify my caching performance-wise Add a unique URL variable (?time=) to make the URL different, and cancel the cache. However, I would have to add this variable to all links on my webpage, not very convenient code-wise This problems becomes greater if I actually have more content that is not the same for registered users and new users.

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• CPU Usage relative to number of users? - ASP.Net Application

  - by soldieraman

  My Asp.net application uses 25-30% of the CPU on a test server which has 600 MB Ram on it. I can see the asp_wb process taking that much percentage of CPU. This is when I am testing using one user. How many users can the server afford then without falling over? Is there a relationship between the CPU Usage and number of user aka if there are 2 users my application will sky rocket to 60% of memory usage? Or does/Should/How does the server handle this?

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• Google Chrome does not honor cache-policy in page header if the page is displayed in a FRAME

  - by Tim

  No matter what I do: <meta http-equiv="Cache-Control" content="no-cache" /> <meta http-equiv="Expires" content="Fri, 30 Apr 2010 11:12:01 GMT" /> <meta http-equiv="Expires" content="0" /> <HTTP-EQUIV="PRAGMA" CONTENT="NO-STORE" /> Google Chrome does not reload any page according to the page's internal cache policy if the page is displayed in a frame. It is as though the meta tags are not even there. Google Chrome seems to be ignoring these tags. Since I've gotten answers to this question on other forums where the person responding has ignored the operative condition, I will repeat it: this behavior occurs when the page is displayed in a frame. I was using the latest released version and have since upgraded to 5.0.375.29 beta but the behavior is the same in both versions. Would someone please care to confirm one way or another the behavior you are seeing with framesets and the caching/expiration policies given in meta tags? Thanks

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• Why does the CPU window always appear when trying to debug my project after a rebuild in Delphi 2010

  - by James

  Hi, Whenever I rebuild my application and try to step into a break-point the CPU window always appears. From what I understand the CPU window appears when DCU does not match up with the source file, however, in my case the DCU's are defintely being re-compiled and there are no old ones lying around or anything like that. The strange thing here is if I close down the application and re-open the project, place the breakpoint and run it works fine. I can even modify files and just press F9 to run the project and it works fine....it only seems to be when I rebuild the project (via IDE Project menu or the project context menu) that this CPU window never breaks into the source (even though it can find it!). I also noticed in the callstack a unit called Generics is always the top of the stack, never the unit my break point is in, this is no way related to where my break point is. Any ideas?

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• Will an IO blocked process show 100% CPU utilization in 'top' output?

  - by Alex Stoddard

  I have an analysis that can be parallelized over a different number of processes. It is expected that things will be both IO and CPU intensive (very high throughput short-read DNA alignment if anyone is curious.) The system running this is a 48 core linux server. The question is how to determine the optimum number of processes such that total throughput is maximized. At some point the processes will presumably become IO bound such that adding more processes will be of no benefit and possibly detrimental. Can I tell from standard system monitoring tools when that point has been reached? Would the output of top (or maybe a different tool) enable me to distinguish between a IO bound and CPU bound process? I am suspicious that a process blocked on IO might still show 100% CPU utilization.

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