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• free -m output, should I be concerend about this servers low memory?

  - by Michael

  This is the output of free -m on a production database (MySQL with machine. 83MB looks pretty bad, but I assume the buffer/cache will be used instead of Swap? [admin@db1 www]$ free -m total used free shared buffers cached Mem: 16053 15970 83 0 122 5343 -/+ buffers/cache: 10504 5549 Swap: 2047 0 2047 top ouptut sorted by memory: top - 10:51:35 up 140 days, 7:58, 1 user, load average: 2.01, 1.47, 1.23 Tasks: 129 total, 1 running, 128 sleeping, 0 stopped, 0 zombie Cpu(s): 6.5%us, 1.2%sy, 0.0%ni, 60.2%id, 31.5%wa, 0.2%hi, 0.5%si, 0.0%st Mem: 16439060k total, 16353940k used, 85120k free, 122056k buffers Swap: 2096472k total, 104k used, 2096368k free, 5461160k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 20757 mysql 15 0 10.2g 9.7g 5440 S 29.0 61.6 28588:24 mysqld 16610 root 15 0 184m 18m 4340 S 0.0 0.1 0:32.89 sysshepd 9394 root 15 0 154m 8336 4244 S 0.0 0.1 0:12.20 snmpd 17481 ntp 15 0 23416 5044 3916 S 0.0 0.0 0:02.32 ntpd 2000 root 5 -10 12652 4464 3184 S 0.0 0.0 0:00.00 iscsid 8768 root 15 0 90164 3376 2644 S 0.0 0.0 0:00.01 sshd

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• Processing files from a Content Distribution Network problem

  - by Derek

  From what I understand that CDNs are meant to physically cache your static files in multiple regions closer to your users. However, I've noticed a few websites that when a page is requested from their server, they grab the asset files from their cdn, process them (compress, minify, etc.) cache the results on their server and then send them to the user requesting the page. This doesn't make too much sense to me. Wouldn't processing the files on your server eliminate the gains from using a cdn? Is this a normal way of doing things, or am I not understanding the whole asset management concept?

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• xDocklet, Maven and Hibernate

  - by Vinothbabu

  I am having some trouble setting up xDocklet and getting this error. Error resolving version for plugin 'xdoclet:maven2-xdoclet2-plugin' from the repositories <pluginRepositories> <pluginRepository> <id>codehaus-plugins</id> <url>http://dist.codehaus.org/</url> <layout>legacy</layout> <snapshots> <enabled>true</enabled> </snapshots> <releases> <enabled>true</enabled> </releases> </pluginRepository> </pluginRepositories> <plugin> <groupId>xdoclet</groupId> <artifactId>maven2-xdoclet2-plugin</artifactId> <executions> <execution> <id>xdoclet</id> <phase>generate-sources</phase> <goals> <goal>xdoclet</goal> </goals> </execution> </executions> <dependencies> <dependency> <groupId>xdoclet-plugins</groupId> <artifactId>xdoclet-plugin-qtags</artifactId> <version>1.0.4-SNAPSHOT</version> </dependency> <dependency> <groupId>xdoclet-plugins</groupId> <artifactId>xdoclet-taglib-qtags</artifactId> <version>1.0.4-SNAPSHOT</version> </dependency> </dependencies> <goals> <goal>xdoclet</goal> </goals> <configuration> <configs> <config> <components> <component> <classname>org.xdoclet.plugin.qtags.impl.QTagImplPlugin</classname> </component> <component> <classname>org.xdoclet.plugin.qtags.impl.QTagLibraryPlugin</classname> <params> <packagereplace>org.xdoclet.plugin.${xdoclet.plugin.namespace}.qtags</packagereplace> </params> </component> <component> <classname>org.xdoclet.plugin.qtags.doclipse.QTagDoclipsePlugin</classname> <params> <filereplace>qtags.xml</filereplace> <namespace>${xdoclet.plugin.namespace}</namespace> </params> </component> <component> <classname>org.xdoclet.plugin.qtags.confluence.QTagConfluencePlugin</classname> <params> <destdir>${project.build.directory}/tag-doc</destdir> <namespace>${xdoclet.plugin.namespace}</namespace> <filereplace>${xdoclet.plugin.namespace}.confluence</filereplace> </params> </component> </components> <includes>**/*.java</includes> <params> <destdir>${project.build.directory}/generated-resources/xdoclet</destdir> </params> </config> </configs> </configuration> </plugin> Some of my questions. Would you recommend me with going with xDocklet. Is there any alternative for it? Is it one of the best way, as hbm's does get generated automatically. Any suggestions on the way how my Java Objects should get persisted in the DB? Any good tutorials over xDocklet Maven and Hibernate. I am using xDocklet to generate HBM's automatically by annotating my POJO's.

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• Lots of files being used by blank web page. What are they?

  - by byronyasgur

  I am trying to optimise a website and I was using the network waterfall facility in Google Chrome. When I looked at the results there were lots of files which I didnt recognise. I first thought they might be something to do with Google Chrome itself, so I put a blank HTML file on my desktop and checked but there was nothing in the waterfall except the file itself. So I put a blank file on my server and I got the output below. What are all these files, are they all necessary, is this normal and do I need to be in any way concerned. My hosting provider has always been excellent in every regard that I'm aware of. My host is shared hosting, using cpanel and is based on a LAMP server. I also note that a couple of those file have problems but I have no idea how to fault find that or whether it's a concern. EDIT: I have cleared the cache so I don't think it's a browser cache issue.

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• Handling hundreds of dependencies with ant

  - by Roberto

  Hi guys, I have to refactor an ant xml file. Basicly I have one big task that checkouts (using cvs) a lot of dependencies, build them, and then copy all the jar/wsdl generated by building them to a directory that I specify. If one dependency version changes, I have to change the name in at least 3 places on the xml file (cvs checkout, build, copy). What I'd like to have is just a single place where I can specify my dependencies name, without having to search & replace the dependency name through the code. One of the problems is that the cvs project could be /path1/path2/project with tag=v12 but then the jars generated by the single project build could be several with different names, so it seems to be a bit complicated. Do you have any idea on how I can get this done?

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• Am I using too much memory? (Rails on EC2 with Resque)

  - by Stpn

  I am looking at the memory usage of the Rails application (it uses background processes via Resque) and since the common answer to the question, "how many workers is too many" was "test and see", I ran some memory commands and wonder if someone can help figuring if the memory usage is high enough already, or I can still add some extra workers.. so (this is all under the maximum load): $ free -t -m total used free shared buffers cached Mem: 1756 1532 223 0 12 229 -/+ buffers/cache: 1291 464 Swap: 895 10 885 Total: 2652 1543 1108 $ vmstat procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 10588 156172 13400 326476 1 6 4 0 5 4 1 0 99 0 If there is any extra info I can provide to help answer this, I would be happy to do so. If the question is strange in some way, please let me know I'd be glad to fix etc..

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• c++: Schedule function call in the future?

  - by User

  Using Visual C++ with MFC. When a certain event occurs in my code, I want to set a function to be called 10 seconds later to perform some activity. The handling of the event happens in a static library that doesn't have any direct links to MFC (and I'd like to keep it that way). How can I schedule a function to be called at some point in the future? Use a Timer I guess? How do I decouple the Timer (which is an MFC dependency) so my business code doesn't have a direct dependency on the GUI? Or maybe something else besides a timer?

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• MongoDB and datasets that don't fit in RAM no matter how hard you shove

  - by sysadmin1138

  This is very system dependent, but chances are near certain we'll scale past some arbitrary cliff and get into Real Trouble. I'm curious what kind of rules-of-thumb exist for a good RAM to Disk-space ratio. We're planning our next round of systems, and need to make some choices regarding RAM, SSDs, and how much of each the new nodes will get. But now for some performance details! During normal workflow of a single project-run, MongoDB is hit with a very high percentage of writes (70-80%). Once the second stage of the processing pipeline hits, it's extremely high read as it needs to deduplicate records identified in the first half of processing. This is the workflow for which "keep your working set in RAM" is made for, and we're designing around that assumption. The entire dataset is continually hit with random queries from end-user derived sources; though the frequency is irregular, the size is usually pretty small (groups of 10 documents). Since this is user-facing, the replies need to be under the "bored-now" threshold of 3 seconds. This access pattern is much less likely to be in cache, so will be very likely to incur disk hits. A secondary processing workflow is high read of previous processing runs that may be days, weeks, or even months old, and is run infrequently but still needs to be zippy. Up to 100% of the documents in the previous processing run will be accessed. No amount of cache-warming can help with this, I suspect. Finished document sizes vary widely, but the median size is about 8K. The high-read portion of the normal project processing strongly suggests the use of Replicas to help distribute the Read traffic. I have read elsewhere that a 1:10 RAM-GB to HD-GB is a good rule-of-thumb for slow disks, As we are seriously considering using much faster SSDs, I'd like to know if there is a similar rule of thumb for fast disks. I know we're using Mongo in a way where cache-everything really isn't going to fly, which is why I'm looking at ways to engineer a system that can survive such usage. The entire dataset will likely be most of a TB within half a year and keep growing.

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• Best usb storage for my router, Asus RT-AC66U?

  - by Jason94

  I have the ASUS RT-AC66U and I want to add a USB storage to it. It has 2x USB, and Im already using one for my printer. So the last one I want to use to attach a USB storage, and I've read some reviews stating the throughput of the USB could be up to 18 mb/s. So in regard of USB storage, should I care about hard disk cache? Simple powered-over-usb seems to have 8 mb cache, other (externally powered) has 16 for instance.

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• removing dependancy of a private function inside a public function using Rhino Mocks

  - by L G

  Hi All, I am new to mocking, and have started with Rhino Mocks. My scenario is like this..in my class library i have a public function and inside it i have a private function call, which gets output from a service.I want to remove the private function dependency. public class Employee { public virtual string GetFullName(string firstName, string lastName) { string middleName = GetMiddleName(); return string.Format("{0} {2} {1}", firstName, lastName,middleName ); } private virtual string GetMiddleName() { // Some call to Service return "George"; } } This is not my real scenario though, i just wanted to know how to remove dependency of GetMiddleName() function and i need to return some default value while unit testing. Note : I won't be able to change the private function here..or include Interface..Keeping the functions as such, is there any way to mock this.Thank

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• Debug unstable Apache server under Debian

  - by almo

  Since yesterday my Apache server that runs on a Debian machine runs very unstable. Sometiems my websites load and sometimes not. I think it has to do with the memory since my Apache log is full of Out of memory (allocated 262144) (tried to allocate 4480 bytes). I also attached a screenshot of the memory graph. A server restart resolves the problem temporarily. I looked at the processes that are using memory but the biggest one is MySQL with 6.5%. Where else can look for the problem? Edit: I did a free -m right after rebooting and one about 2 hours later. I think the trend is visible: root@xxx:~# free -m total used free shared buffers cached Mem: 4016 731 3284 0 80 200 -/+ buffers/cache: 449 3566 Swap: 459 0 459 root@xxx:~# free -m total used free shared buffers cached Mem: 4016 2466 1550 0 92 473 -/+ buffers/cache: 1900 2115 Swap: 459 0 459

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• maven: multi module HAR dependencies

  - by QuanNH

  I have a multiple module project The first module contains my hibernate xml files and data java beans and packages as har. The second module defines my DAO classes. This module has a dependancy on data java beans with in the har and is defined in pom.xml. <dependency> <groupId>myproject</groupId> <artifactId>myhar</artifactId> <version>1.0</version> <type>har</type> </dependency> The first module compiles, packages and installs fine into my local repository. The problem is when the second modules compiles it has a problem finding the packages and class defined in my har module. I get the following output from running mvn install package myproject.myhar does not exist and build fails.

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• VMware Workstation 7&8&9 does not generate /etc/vmware/network upon installation

  - by dash17291

  When I install VMware Workstation on Arch linux Virtual ethernet is not working. $ sudo tail /var/log/vnetlib Aug 28 22:20:33 VNLFileExists - Cannot check for file or directory: /etc/vmware/networking , error: No such file or directory Aug 28 22:20:33 VNLNetCfgLoad - Import file does not exist Aug 28 22:20:33 VNL_Load - Error loading the vnet configuration, file used: /etc/vmware/networking Aug 28 22:20:33 VNLNetCfgUnload - Requested cache is not loaded Database file is not present. Failed to initialize Aug 28 22:20:41 VNLFileExists - Cannot check for file or directory: /etc/vmware/networking , error: No such file or directory Aug 28 22:20:41 VNLNetCfgLoad - Import file does not exist Aug 28 22:20:41 VNL_Load - Error loading the vnet configuration, file used: /etc/vmware/networking Aug 28 22:20:41 VNLNetCfgUnload - Requested cache is not loaded Required modules compiled. Previously I have copied that file or directory (I don't remember) from a working installation, but now I need a real solution. It's strange for me, may be a hardware issue also because with Ubuntu the same thing happens on the same computer.

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• Always require a plugin to be loaded

  - by axon

  I am writing an application with RequireJS and Knockout JS. The application includes an extension to knockout that adds ko.protectedObservable to the main knockout object. I would like this to always be available on the require'd knockout object, and not only when I specify it in the dependencies. I could concat the files together, but that seems that it should be unnecessary. Additionally, I can put knockout-protectedObservable as a dependency for knockout in the requirejs shim configuration, but that just leads to a circular dependency and it all fails to load. Edit: I've solved me issue, but seems hacky, is there a better way? -- Main.html <script type="text/javascript" src="require.js"></script> <script type="text/javascript"> require(['knockout'], function(ko) { require(['knockout-protectedObservable']); }); </script> -- knockout-protectedObservable.js define(['knockout'], function(ko) { ko.protectedObservable = { ... }; });

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• Squid throws error, The requested URL could not be retrieved

  - by Supratik

  Hi Sometimes I am getting the following error The requested URL could not be retrieved While trying to retrieve the URL: http://groups.google.com/ The following error was encountered: Unable to determine IP address from host name for groups.google.com The dnsserver returned: Refused: The name server refuses to perform the specified operation. This means that: The cache was not able to resolve the hostname presented in the URL. Check if the address is correct. Your cache administrator is root. What could be the reason for the above error ? Regards Supratik

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• ASP Fails with 500 Error

  - by VinceM

  We have a server setup as an IIS box and have some static pages with a few asp pages that handle the form submissions. The asp is really vbscript that sends a CDO message. When moving these pages to the new server the form will not submit, it gives a 500 error and the following shows in Event Viewer: Error: The Template Persistent Cache initialization failed for Application Pool 'DefaultAppPool' because of the following error: Could not create a Disk Cache Sub-directory for the Application Pool. The data may have additional error codes.. I can't seem to find any info on this anywhere... I was thinking it may have something to do with the fact that we created this server from an image of another server. Thanks for your help in advance... Vince

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• RAID10 Without BBU, With UPS

  - by Richard

  My datacenter says that each rack has primary and backup power on each rack. I assume this means there is a UPS for each server. Therefore, do I have any need of getting a BBU for the following setup? Intel Cherry 520 SSD x 4 RAID 10 LSI-9260 with WRITEBACK CACHE ENABLED I have heard that without a BBU the data in the cache could be lost. Since my needs aren't mission-critical, I can afford to lose some data. But would the rest of the data on the HD be corrupted?

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• Eclipse content assist with maven project not picking up all classes

  - by thickosticko

  I'm using Eclipse 3.5.0, and have imported a maven project using the import maven project from SCM wizard (M2 plugin). I have a jar file as a dependency in my pom. and inside the jar is a complicated schema - with quite a number of XSD's. But the content assist doesn't seem to pick up the schema at all, nor a number of other classes in the dependency list. yet for another module in the same project it seems to work ok. Does anyone know why this is? it's driving me mad!

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• Odd behavior of permissions and icons

  - by Urban

  After some virus had infected my Windows 7, I did a complete format and re-installed the OS. I was just installing applications and copying back some data when I noticed some shortcuts changing their icons to something I couldnt recognize (Yellow icons in the image below). Also, a few exe files which previously did not ask for User permission, are now asking for it. Wondering if this is an icon cache problem, I cleared the cache by deleting the IconCache.db in AppData/Local but the problem still persists. Although I did a full system scan with MS Security Essentials, I'm not sure if this is another virus or some other problem. I would appreciate any suggestions you might have. Edit: Now even Firefox needs permissions to launch. It's icon hasnt changed, but it's got the 'shield' overlay on it like the other yellow icons.

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• When does a cached website refresh?

  - by user142485

  If i go to example.com [placeholder for different website] it creates the numerous cache entries in the browser for different items on the page and two entries for example.com. One of which expires in 1.5hrs and the other has 'No expiration time.' What I am wondering is: when does the browser display the cached page and when does it get the newest version from the server (when re-visiting the site)? What do the two different expiration times for the top level domain mean? A web page I went to was temporarily redirecting to a different page. After it was back up, I was still getting redirected to the temp page even though the correct page was up. Would this have eventually resolved itself based on expiration times or does the cache need to be cleared?

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• Chrome Residual Redirect to Login Page

  - by Shadow503

  My college redirects people in the dorms to a login page when using an ethernet (or wifi) connection. I am now at home, and certain domains keep redirecting to this login page. I've tried running ipconfig /flushdns and I flushed the chrome's local dns cache as described here: How to clear/flush the DNS cache in Google Chrome?. Interestingly enough, while http://www.reddit.com redirects to the login page, http://www.reddit.com/r/funny works. Firefox works fine for both urls. Is there a way to fix this without deleting all of my cookies? Thanks!

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• is using Hosts for resolving a sql-server more performant?

  - by Ice

  Hi, we have a legacy application which uses a access.mdb with hundreds of ODBC-connected tables on a sql-server. the access.mdb contains nothing else than these odbc-connections. Now we consider to use a virtual sql-servername for these odbc connections and resolve it in the local hosts-file with the ip-address of the real sql-server. Like this we can easy switch between a test-sql-database server and the the server for production in changing one single entry in the hosts. EVERYTHING works fine and now comes the question: Could it be that this is more performant because there is one single point on resolving the sql-server (name or ip-address)? Is there something like a network-cache / DNS-Cache? peace Ice

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• Third Party Libraries and Technologies very Java Programmer must be aware of?

  - by kunjaan

  I agree that this is a very subjective question but as a student of Java , I get suggested good libraries and technologies for Java by my mentors at work. For example, I was not aware of Google Guice for Dependency Injection, awesomeness of Java Reflection APIs, ORMs like Hibernate or stuffs you could do with libraries like Hadoop. I want to collect and share some of the libraries that exemplifies good java programming (so that beginners like me could code walk and emulate the coding practice), teach unique concepts to Java (for example Dependency Injections or ORM) and/or are really interesting libraries that a student like me would get to do interesting projects on (eg. Hadoop). I redited this question 3 times to make it more specific : ). I am sorry if I am really not clear in my intentions. But some kind of a list of good concepts and third party libraries for Java could really help some of my intern friends here at work. Thank you.

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• Possible to implement an IsViewPortVisible dependencyproperty for an item in an ItemsControl?

  - by Matt H.

  I need to enable/disable spell checking in a richtextbox in an ItemsControl, based on whether the RichTextBox is visible in the ItemsControl's Scrollviewer. I think the route is to implement an IsViewPortVisible dependency property and wire an event handler for a changed event... I found this article that describes the lengthy process for determining if an item is in the viewport: http://social.msdn.microsoft.com/Forums/en/wpf/thread/e6ccfec3-3dc0-4702-9d0d-1cfa55ecfc90 Any ideas on where to start? I'm familiar with implementing my own dependency property for the sake of simple bindings (integers, strings, etc...). I have no idea how to undergo something like this though) This is the end result I'm hoping for: <DataTemplate> <Grid> ...Stuff in the Grid <local:CustomRichTextBox SpellCheck.IsEnabled={Binding RelativeSource={RelativeSource Self}, Path=IsViewPortVisible}/> </Grid> </DataTemplate> Help will be EXTREMELY appreciated... you'll be saving me about 500MB in memory consumption while the program is running!!!! :)

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• How to change memory for DomU runtime

  - by saffron

  I have a xen server with xen-4.1.3, linux-image-3.2.0-3-amd64, debian squeeze and 16Gb of RAM. The domain-0 has 1Gb of ram, the rest of memory belongs to the hypervisor. I want to start a guest domain with a minimal amount of memory and increase it runtime later. When I start a guest domain with 256Mb of ram and run xm mem-set domu 4Gb, I get ~3Gb only in domu and a guest domain free says: root@test:~# free total used free shared buffers cached Mem: 2830620 72868 2757752 0 2432 43504 -/+ buffers/cache: 26932 2803688 Swap: 1048572 0 1048572 And a guest domain dmesg says: [ 0.000000] Memory: 175912k/2883584k available (3527k kernel code, 448k absent, 2707224k reserved, 3210k data, 612k init) When I start a guest domain with 2Gb of ram I can run xm mem-set domu 7Gb and get ~7Gb of ram in a guest domain: root@test:~# free total used free shared buffers cached Mem: 6828228 74944 6753284 0 1328 12568 -/+ buffers/cache: 61048 6767180 Swap: 1048572 0 1048572 And a guest domain dmesg: [ 0.000000] Memory: 1674960k/16651264k available (3527k kernel code, 448k absent, 14975856k reserved, 3210k data, 612k init) How can I start a guest domain with a minimal amount of ram (256Mb) and increase it under 15Gb?

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