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• POX return data from WCF Data Services

  - by keithwarren7

  I am using WCF Data Services (netfx4) to provide data sourced from SQL via EF, the standard OData mechanism is fine and JSON works as well but I need a third option for generic POX (plain old xml). I have yet to come across a simple strategy or switch that allows me to control this but I am sure one must exist or a workaround method might be available. Any ideas? Ideally I would like to be able to use something like the JSONP option wherein I append 'format=JSON' to the URL, in this case 'format=pox' or 'POX=true' or something of that nature.

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• Data structure: sort and search effectively

  - by Jiten Shah

  I need to have a data structure with say 4 keys . I can sort on any of these keys. What data structure can I opt for? Sorting time should be very little. I thought of a tree, but it will be only help searching on one key. For other keys I'll have to remake the tree on that particular key and then find it. Is there any data structure that can take care of all 4 keys at the same time? these 4 fields are of total 12 bytes and total size for each record - 40 bytes.. have memory constraints too... operations are : insertion, deletion, sorting on different keys.

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• How to dynamically add controls in asp.net Dynamic Data

  - by loviji

  Hello, i'm trying to work with asp.NET Dynamic Data. So, I see asp.NET Dynamic Data not well learned by people as other technologies. now, to my question. Lets us work with Details.aspx page that located on ~\DynamicData\PageTemplates I need to add <asp:DynamicControl runat="server" to page into Form1.detailsTable. i've tried like this: protected DynamicControl myC=new DynamicControl(); protected void Page_Load(object sender, EventArgs e) { foreach(var c in table.Columns) { myC.DataField=c.DisplayName; FormView1.Controls.Add(myC); } } but I can not see the desired result. where is the problem. thanks

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• Deleted Partition Recovery

  - by ankur.trapasiya

  Recently i was installing ubuntu 12.04 on my system. There were 4 partitions on my system and i selected one of the four partition for the installation and chose the option of re sizing the partition. Initially my partition was of size 100+GB and i created another partition out of it of size 15GB (EXT4). Now the moment i changed this partition structure my original partition got lost along with its data and i am left with 50GB partition and 50GB unallocated free space. Now the data that i have lost is meant a lot to me and i want to recover that data. So is there any way i can recover it ? And i haven't checked "format" option while resizing the partition. Thanks in advance.

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• Fast set indexing data structure for superset retrieval

  - by Asterios

  I am given a set of sets: {{a,b}, {a,b,c}, {a,c}, {a,c,f}} I would like to have a data structure to index those sets such that the following "lookup" is executed fast: find all supersets of a given set. For example, given the set {a,c} the structure would return {{a,b,c}, {a,c,f}, {a,c}} but not {a,b}. Any suggestions? Could this be done with a smart trie-like data structure storing sets after a proper sorting? This data structures is going to be queried a lot. Thus, I'm searching for a structure that might be expensive in build but rather fast to query.

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• Recovering data from hard disk after an accidental Ubuntu reinstallation

  - by Saurabh Agarwal

  My computer got wiped accidentally due to a fresh Ubuntu installation. Since the drive contains very important data and codes, it would be really great if the same could be recovered. It is a 2TB hard drive which had Ubuntu 10.10 earlier. It now has a Ubuntu 12.04 installed on it (which I understand occupies ~4GB). The machine has been powered off since. The installation was done using a usb with the option where the previous ubuntu installation is removed. Since installation doesn't take a lot of time, I'm inclined to think that the disk wasn't completely formatted and that most of the data is still there. I have no experience with recovery and hence a detailed explanation is very helpful. NOTE: I can arrange an additional 2TB hard disk for copying data. My computer has a fast internet connection and I have other computers connected to the network which I may use to access the previous one as well.

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• Out-Of-Memory while doing Core Data migration

  - by Kamchatka

  Hello, I'm migrating a CoreData model between two versions of an application. I was storing binary data as blobs in the previous version and I want to take them out of the blobs for performance. My issue is that during the migration it seems that Core Data loads everything into memory which leads to Low Memory Warnings and then to my app being killed. Apple documentation suggests the following : http://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CoreDataVersioning/Articles/vmCustomizingTheProcess.html#//apple_ref/doc/uid/TP40005510-SW9 However, it seems to rely on the fact that the large objects are applied different mapping. In my case, all the objects are basically the same and the same mapping has to be applied to each of them. I don't see in this case how I could apply their technique. How should I handle a migration with very large objects ?

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• Serializing Data Structures in C

  - by src

  I've recently read three separate books on algorithms and data structures, tcp/ip socket programming, and programming with memory. The book about memory briefly discussed the topic of serializing data structures for the purposes of storing it to disk, or sending it across a network. I can't help but wonder why the the other two books didn't discuss serialization at all. After an unsuccessful web/book search I'm left wondering where I can find a good book/paper/tutorial on serializing data structures in C? Where or how did you learn it?

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• How to expose an entity via alternate keys with spring data rest

  - by dan carter

  Spring-data-rest does a great job exposing entities via their primary key for GET, PUT and DELETE etc. operations. /myentityies/123 It also exposes search operations. /myentities/search/byMyOtherKey?myOtherKey=123 In my case the entities have a number of alternate keys. The systems calling us, will know the objects by these IDs, rather than our internal primary key. Is it possible to expose the objects via another URL and have the GET, PUT and DELETE handled by the built-in spring-data-rest controllers? /myentities/myotherkey/456 We'd like to avoid forcing the calling systems to have to make two requests for each update. I've tried playing with @RestResource path value, but there doesn't seem to be a way to add additional paths.

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• Data structure supporting the following operations

  - by 500865

  I'm looking for a data structure for working with a set of data which is most efficient to do the following : Check whether an item has been categorized or not. (The categorized and uncategorized set are disjoint sets). Get the category of an item. Get all the items in a particular category. Get all the uncategorized items. Remove a particular item from the data set. I was thinking of having a Dictionary<String, Set<String>> to hold all the items in a given category, but that doesn't solve 2.

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• UPOS RFIDScanner data format

  - by Robert Snyder

  A lot of work that I do currently is based in the OPOS/UPOS world. My company has a device that can read 13.56Mhz tags (RFID), Smart Cards, and Mag Stripe cards. Up until somewhat recently I have only been working with RFID for a very specific scenario. That was to read UltraLight C and Desfire cards. These cards were all setup very specifically so that I could take the data read from those cards and force it into a MSR track2 format. The past couple of weeks, however, I have been working on reading RFID credit cards (since I have a Visa card I've been using mine), and Smart Card credit cards. (The visa card I have has both) In learning how to communicate with SmartCard and reading ISO7816 and EMVCO documents I became a little more familiar with how info is stored. But now I have a question regarding UPOS. The RFID data on my Visa is stored (and read) very similar to how the data is stored and read from the Smart Card on my Visa. Cool. Well in the UPOS spec for SmartCardRW the ReadData method returns a byte array. That's cool, I can just return all that data and then parse it as my heart desires. The RFID though has a LinkedList of Tags. Well this makes sense in terms of my Visa card (reminds me of a question I have in regards to SmartCard, but that is for another question) but what about ULC and Desfire, or for that matter any Mifare card. Pages, Files, Purses don't exactly fit the Tag profile. For instance lets just say I read pages 4-12 on my ULC card. Each page I read is 4 bytes long. Does this mean I have 9 tags in my LinkedList? Is my Tag id the page number? Or then how does that translate to Desfire? I open application 123456 and read file 1 and file 2, Do I have 2 tags? and if so what is my tag id? At least with my Visa I think that I have to use the Tag id (ex 5F24 for my expiration date) and value of {0x15, 0x10, 0x31} Part of me says yes..that makes sense. Another part of me says, "well if that is the case then why doesn't SmartCardRW have Tags?" So that is my question. How do I format my data from those different types of media? or is that the job of my Control Object (the application)? Is so how does it know? The only protocols I have are: // Summary: // Enumerates the available predefined RFID tag protocols the device supports. [Flags] public enum RFIDProtocols { EpcClass0 = 1, RFIDSdt0Plus = 2, EpcClass1 = 4, EpcClass1Gen2 = 8, EpcClass2 = 16, Iso14443A = 4096, Iso14443B = 8192, Iso15693 = 12288, Iso180006B = 16384, Other = 16777216, All = 1073741824, } If I use that well all of my cards that I have are all Iso14443A. I use the ATQA and the SAK to know what type of card I really have. There is no RFID property that lets me specify that. So I'm lost.

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• How is load average related to CPU utilization?

  - by Kaustubh P

  I am facing a load average of 3 since past 2 days. The CPU utilization is never above 40 % in all cases. Here are some screenshots of Server Density monitoring tool that I use. The process snapshot at the highest peak, @ 0:00 is as follows: And the process snapshot at the peak created at 12:00 is: My question is, even though CPU utilization is not 100 %, why am I facing a high average? PS: All snapshots are sorted by descending CPU utilization.

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• Widely-used load balancing solutions?

  - by Vimvq1987

  I asked this question http://serverfault.com/questions/124329/network-load-balancing-efficience-and-limits, and a bit disappointed that NLB was not a widely-used solution. I want to ask about widely-used solutions in the world now. Can you give me a list and a brief introduction for each? Cause of limitation of my thesis resource, I need to focus on software-only, Windows-based solution (both database level and system level are welcome). Thank you so much!

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• load balancing in Tomcat

  - by Alvin

  Hi All, I want to implement the load balancing in tomcat 6.0 so that we can create more than one instance of a tomcat and when any of the instance is down then other instance will run our application. so that our application will never be down even when the large number of concurrent request comes. But i have no idea to implement it. Please give your precious suggestions.

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• CPU, Memory, Network, IO resources are under utilized when I tried various JMeter load testing

  - by Jaiganesh

  CPU, Memory, Network, IO resources are under utilized when I tried various JMeter load testing. I have given below the details. Hardware: 1 Core with 2 GB RAM OS: Ubuntu 12.04 LTS Server Edition Application: PHP (using JQuery, Ajax) JMeter Parameters: 10, 20, 30, 40 Hits per minute 220 Test Cases per hit 2.03 MB per hit I am not clear, why these resources are under utilized. Please help me to resolve this.

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• Tomcat Clustering and Load Balancing ?

  - by Rodrigo Asensio

  I have 3 tomcat servers where users get into all time. They are 3 because the processing of each request is heavy (lot of sql). Users enters to server 1 or 2 or 3. Now I want to make them "one". I know I need do clustering but, will clustering spread the requests thru the 3 servers or here is where I need implement load balancing with apache2 ?

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• kerio load balance

  - by Azzam

  I use kerio winroute 6.5 , for week ago, i got a second adsl link (2 mbps), i tried to configue the load balancing in kerio , but always , kerio directs the traffic to one route without the other , i enabled NAT for firewall and change the rate between 2 links but always kerio takes the system route to one link , is there a solution for that ?

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• Load and performance testing for webapps with JavaScript support

  - by MrG

  Years ago I used OpenSTA to perform load and performance tests. Unfortunately it doesn't support JavaScript, which is a requirement this time. But I remember that it offered great recording possibilities which enabled us to quickly create new test scripts. Please let me which tools you recommend. Free tools are clearly preferred ;)

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• 4.5 Load average on single CPU

  - by Webnet

  I'm currently looking at... top - 16:27:37 up 27 min, 1 user, load average: 4.96, 3.75, 2.87 Tasks: 141 total, 6 running, 135 sleeping, 0 stopped, 0 zombie Cpu(s): 91.4%us, 6.9%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.3%hi, 1.3%si, 0.0%st Mem: 514952k total, 507500k used, 7452k free, 5652k buffers Swap: 1044184k total, 281400k used, 762784k free, 89164k cached This is a single 2.0 Ghz CPU with 2 GB RAM Is it time for an upgrade? I'm watching and it seems to stick around 50% CPU "us" which I assume means usage.

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• trace server load? how to

  - by Clear.Cache

  My server (Centos 4.8) keeps shooting up in load. Its a shared hosting server with Cpanel/WHM. How can I trace the process/user causing this ongoing problem? I use top, but it shows nothing that stands out for a particular script from a particular user. I have suPHP enabled with PHP 5.3x and MySQL 5 as well.

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• Add Machine Key to machine.config in Load Balancing environment to multiple versions of .net framework

  - by davidb

  I have two web servers behind a F5 load balancer. Each web server has identical applications to the other. There was no issue until the config of the load balancer changed from source address persistence to least connections. Now in some applications I receieve this error Server Error in '/' Application. Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. 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.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. Source Error: The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL: Add a "Debug=true" directive at the top of the file that generated the error. Example: or: 2) Add the following section to the configuration file of your application: Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode. Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario. How do I add a machine key to the machine.config file? Do I do it at server level in IIS or at website/application level for each site? Does the validation and decryption keys have to be the same across both web servers or are they different? Should they be different for each machine.config version of .net? I cannot find any documentation of this scenario.

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• load balancing between physical and virtual machines

  - by fefe

  First of all sorry if my question would be not relevant, I'm quite beginner. In short: I have 2 physical machines - first(Windows Server 2007, Apache 2.2) on the second machine esxi installed to host virtual machines . I have been converted my physical machine(1) on esxi(2) and in the next step I would like to deploy a load balancer between the physical and virtual machine. Would be this workaround appropriate? If yes what are the steps to follow?

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• What is the difference between "load" and "fetch"?

  - by DragonLord

  I often encounter the words load and fetch in contexts where data are being read from some source, and they seem to have slightly different meanings. What's the difference? I've done some research and couldn't find any specific technical difference in general usage. While the term fetch can refer to one stage in CPU instruction execution, I've seen it used in contexts not related to CPUs, and I'm looking for an answer that is not specific to CPUs.

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• linux multipath routing load balance

  - by user52883

  I would like to know how to load balance two Business DLS links which have fixed IPs. I believe it would look something like this: ip route add default scope global \ nexthop via gatewayDLS1 dev interface1 weight 1 \ nexthop via gatewayDLS2 dev interface2 weight 1 Is this be all I need in order to get multipath routing? Please, give me a more detailed answer if possible, thanks you.

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• Trace Server Load: Simple "How To"?

  - by Clear.Cache

  My Server Specs: - Centos 4.8 32 bit - Cpanel / WHM - suPHP enabled on PHP 5.3x - MySQL 5x I need someone to please show me various ways to trace what is causing server load spikes. Sometimes I see so many "nobody" users running httpd processes, but I dont' know how to determine what user(s) it might be, even though suPHP is enabled.

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