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  • In .NET, What Is Fastest Way to Initialize Multi-Dimensional Array to Non-Default Value

    - by AMissico
    How do I initialize a multi-dimensional array of a primitive type as fast as possible? I am stuck with using multi-dimensional arrays. My problem is performance. The following routine initializes a 100x100 array in approx. 500 ticks. Removing the int.MaxValue initialization results in approx. 180 ticks just for the looping. Approximately 100 ticks to create the array without looping and without initializing to int.MaxValue. Routines similiar to this are called a few tens-of-thousands to several million times. I am open to suggestions on how to optimize this non-default initialization of an array. One idea I had is to use a smaller primitive type when available. For instance, using byte instead of int, saves 100 ticks. I would be happy with this, but I am hoping that I don't have to change the primitive data type. public int[,] CreateArray(Size size) { int[,] array = new int[size.Width, size.Height]; for (int x = 0; x < size.Width; x++) { for (int y = 0; y < size.Height; y++) { array[x, y] = int.MaxValue; } } return array; }

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  • Partially constructed object / Multi threading

    - by reto
    Heya! I'm using joda due to it's good reputation regarding multi threading. It goes great distances to make multi threaded date handling efficient, for example by making all Date/Time/DateTime objects immutable. But here's a situation where I'm not sure if Joda is really doing the right thing. It probably is correct, but I'd be very interested to see the explanation for it. When a toString() of a DateTime is being called Joda does the following: /* org.joda.time.base.AbstractInstant */ public String toString() { return ISODateTimeFormat.dateTime().print(this); } All formatters are thread safe, as they are as well ready-only. But what's about the formatter-factory: private static DateTimeFormatter dt; /* org.joda.time.format.ISODateTimeFormat */ public static DateTimeFormatter dateTime() { if (dt == null) { dt = new DateTimeFormatterBuilder() .append(date()) .append(tTime()) .toFormatter(); } return dt; } This is a common pattern in single threaded applications. I see the following dangers: Race condition during null check -- worst case: two objects get created. No Problem, as this is solely a helper object (unlike a normal singleton pattern situation), one gets saved in dt, the other is lost and will be garbage collected sooner or later. the static variable might point to a partially constructed object before the objec has been finished initialization (before calling me crazy, read about a similar situation in this Wikipedia article. So how does Joda ensure that not partially created formatter gets published in this static variable? Thanks for your explanations! Reto

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  • Maven3 Issues with building a multi-module enterprise project

    - by Sujit K
    I just migrated from Maven2 to Maven3 and I'm able to build each module individually or all the modules in one shot by calling mvn clean install. However, in Maven2, since we have multi-module enterprise project, we build multiple ear's and each ear is built as its own module with its own child pom. To build an individual ear with its dependents, the below command works fine in Maven2 but not in Maven3. Let me explain the issue in Maven3 a bit later. mvn -pl ear_module -rf first_dependent_module -am clean install In Maven2 when the reactor lists the build order, I see first_dependent_module second_dependent_module ear_module End of the day I have my ear module also part of the reactor which is how it should be. The reason we call -rf is we don't want to delete the target folder at the main ${project.basedir} (so not to delete the output created in target from building the other ear modules). With Maven3, however, this is all I see when the reactor lists the build order: first_dependent_module second_dependent_module Maven3 totally ignores the argument (ear_module) set to -pl flag to be also built after its dependents have been. Not sure what I'm missing here. Any help/tips would be greatly appreciated. P.S: The build I'm making is similar to the one below.... Build specific module in multi-module project Thanks, SK

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  • MS SQL - Multi-Column substring matching

    - by hamlin11
    One of my clients is hooked on multi-column substring matching. I understand that Contains and FreeText search for words (and at least in the case of Contains, word prefixes). However, based upon my understanding of this MSDN book, neither of these nor their variants are capable of searching substrings. I have used LIKE rather extensively (Select * from A where A.B Like '%substr%') Sample table A: ID | Col1 | Col2 | Col3 | ------------------------------------- 1 | oklahoma | colorado | Utah | 2 | arkansas | colorado | oklahoma | 3 | florida | michigan | florida | ------------------------------------- The following code will give us row 1 and row 2: select * from A where Col1 like '%klah%' or Col2 like '%klah%' or Col3 like '%klah%' This is rather ugly, probably slow, and I just don't like it very much. Probably because the implementations that I'm dealing with have 10+ columns that need searched. The following may be a slight improvement as code readability goes, but as far as performance, we're still in the same ball park. select * from A where (Col1 + ' ' + Col2 + ' ' + Col3) like '%klah%' I have thought about simply adding insert, update, and delete triggers that simply add the concatenated version of the above columns into a separate table that shadows this table. Sample Shadow_Table: ID | searchtext | --------------------------------- 1 | oklahoma colorado Utah | 2 | arkansas colorado oklahoma | 3 | florida michigan florida | --------------------------------- This would allow us to perform the following query to search for '%klah%' select * from Shadow_Table where searchtext like '%klah%' I really don't like having to remember that this shadow table exists and that I'm supposed to use it when I am performing multi-column substring matching, but it probably yields pretty quick reads at the expense of write and storage space. My gut feeling tells me there there is an existing solution built into SQL Server 2008. However, I don't seem to be able to find anything other than research papers on the subject. Any help would be appreciated.

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  • Multi-reader IPC solution?

    - by gct
    I'm working on a framework in C++ (just for fun for now), that lets the user write plugins that use a standard API to stream data between each other. There's going to be three basic transport mechanisms for the data: files, sockets, and some kind of IPC piping system. The system is set up so that for the non-file transport, each stream can have multiple readers. IE once a server socket it setup, multiple computers can connect and stream the data. I'm a little stuck at the multi-reader IPC system though. All my plugins run in threads so they live in the same address space, so some kind of shared memory system would work fine, I was thinking I'd write my own circular buffer with a write pointer and read pointers chassing it around the buffer, but I have my doubts that I can achieve the same performance as something like linux pipes. I'm curious what people would suggest for a multi-reader solution to something like this? Is the overhead for pipes or domain sockets low enough that I could just open a connection to each reader and issue separate writes to each reader? This is intended to be significant volumes of data (tens of mega-samples/sec), so performance is a must.

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  • Noise with multi-threaded raytracer

    - by herber88
    This is my first multi-threaded implementation, so it's probably a beginners mistake. The threads handle the rendering of every second row of pixels (so all rendering is handled within each thread). The problem persists if the threads render the upper and lower parts of the screen respectively. Both threads read from the same variables, can this cause any problems? From what I've understood only writing can cause concurrency problems... Can calling the same functions cause any concurrency problems? And again, from what I've understood this shouldn't be a problem... The only time both threads write to the same variable is when saving the calculated pixel color. This is stored in an array, but they never write to the same indices in that array. Can this cause a problem? Multi-threaded rendered image (Spam prevention stops me from posting images directly..) Ps. I use the exactly same implementation in both cases, the ONLY difference is a single vs. two threads created for the rendering.

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  • Windows 7 pro remote desktop true multi monitor support patch or hack

    - by Ryan D
    After hours of research the closest i came to any patch that could fix this was a concurrent sessions patch which is not what i want. I have two machines both windows 7 professional. Its not an option to upgrade either to ultimate as the computer being remoted is in another state at our corp office. I need Dual monitor support and would have used the multimon i:1 edit thing however the other tower is not Win 7 ultimate. I have read over and over how it is not supported except with ultimate and enterprise and 2008 server. What have they put into windows 7 ultimate that is not in Win 7 pro and how can i get it or patch Win 7 pro to give it the same functionality. I would have paid for a software patch had i been able to find it anywhere. Summary: I am looking for the ability to remote to a Win 7 pro computer with another Win 7 computer while being able to use Dual monitors. Is there anyone that has the skill or balls to help with this? Most Respectfully Ryan

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  • Multi Svn Repositories in Apache

    - by fampinheiro
    I have a set up with apache and subversion In the apache configuration i have <Location /svn> DAV svn SVNParentPath c:/svn </Location> Now i have multiple repositories a a_b a_c a_b_c a_b_d b and i want to map them as a/svn a/b/svn a/c/svn a/b/c/svn a/b/d/svn b/svn to do this without adding directives and restarting apache i tought of making this rules RewriteEngine On RewriteCond $1 !=svn RewriteCond $2 !=svn RewriteRule ^/([^/]+)/(.*?)/svn/(.*)$ /$1_$2/svn/$3 [N] RewriteRule ^/([^/]+)/svn/(.*)$ /svn/$1/$2 [L,PT] this way i rewrite them to /svn/a /svn/a_b /svn/a_c /svn/a_b_c /svn/a_b_d /svn/b The objective is that the client don't have the notion of this happening when a acess is made to a folder without trailing slash the mod dav return a redirect to the folder with the trailing slash exposing my internal url. can i rewrite the outgoing url ?!

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  • EC2 hosted service multi-tenant dynamic DNS solution

    - by accidental admin
    I want to change the model of my EC2 hosted service to have a separate sub domain for each tenant (ie. .example.com). My primary DNS is now with dnsmadeeasy.com, but their dynamic DNS offering seem pretty weak: it requires the API to use my full dnsmadeeasy.com account credentials, I rather have the API use a limited privilege credential that can only add/remove/modify subdomain records from what I gather it only allows to modify existing records, does not allow me to dynamically add/remove records for new tenant subdomains My question what are my alternatives? Is there something in the dnsmadeeasy API offering I misunderstood and I should just use them? Is there some other similar DNS service that has a DDNS offering that satisfies my requirements? Or should I just bite the bullet and host my own DNS (my fear is not configuration/learning/know how, my fear is reliability). If you recommend the latter, can you detail the necessary steps or a link to a good tutorial how to?

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  • Unlimited and multi-computer online storage solutions with automatic backup

    - by JRL
    As the title says, what are the existing online storage solutions that provide: unlimited storage automatic backup and allow for an unlimited number of computers (use not tied to a single computer)? There are several existing questions on this site related to online storage solutions, but none that is specifically targeted to what I want, so I thought I'd ask the question. This wikipedia article lists some of them, are there others? How do they compare in terms of price, feature set and ease of use? Update: Kinda disappointed no one has any answers to this so far. JungleDisk looks promising, anyone have experience with it? Update 2: To answer the comments, what I'm looking for definitely DOES exist. These solutions all seem to fit the bill: BackMii CrashPlan DataPreserve Humyo JungleDisk KeepVault SpiderOak And some of them are quite cheap (CrashPlan is $100 a year). For unlimited space and computers, I'd say that's pretty good. Does anyone have experience with CrashPlan or any other of the above solutions?

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  • setting up synergy (multi-computer shared input devices) new to mac

    - by pedalpete
    I've just gotten a mac and the first thing I'm trying to do in setting it up for dev is to set-up synergy. I've run into countless issues, and am making progress, but that 'mac's just work' theory is getting tired really fast. I'd prefer running the mac as the server, as it's a desktop. why use my pc(laptop) as the server. So i downloaded synergy, and tried to edit the 'synergy.conf' file. First with textmate, then with apple script. Neither of these applications will open the file. Even after changing textmate to use plain text format and switching off a few other things to make it into a plain text editor. No good. Uh, isn't that what these script/text editors are for? Then I found SyneryKM which is a package to run synergy on osx. Took LOTS of fiddling, but I think I finally kinda got it figured out. I've got my pc & mac both running synergy. However, my pc will only connect to synergy using the ip address. No problem, however, my mac won't connect to itself as a synergy server using the IP address. If I use the ip address as a screen in the 'server configuration file', i get a 'Error: unknown screen name mymac'. I know this shouldn't be super complicated, and possibly not the place to find answers about synergy, but I couldn't find a better place, and there has been some talk of synergy here. Any chance somebody can help with this?

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  • Best solution for Multi-WAN failover (inside & out)?

    - by Sean O
    Looking for a way to setup 2 ISPs in failover mode, for both incoming & outgoing traffic, for our small (<100 devices) network. The leading contender for now seems to be the Peplink Balance 310. However, a reseller I spoke with said it's great for 100% outgoing connectivity, but didn't seem to be confident in its abilities to handle incoming traffic. This is important as we host our own web site, Exchange e-mail, and virtual desktops (RDP). Do any Peplink owners use this for failover of incoming traffic? Are there other devices I should be considering? We're currently using a Cisco 1800 series router & ASA 5500 series firewall, with Comcast & T-1 lines (the goal being to replace the T with DSL/FiOS {whenever that becomes availble}). Price range: ~$1000 - $2500 USD. Thanks.

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  • Multi-Boot through IPMI possible?

    - by yoursort
    Hi, I want to setup a cluster. On each machine Windows XP and Linux should be installed and the OS should be selectable by a boat loader (e.g. grub). All machines have IPMI cards. Is it possible when starting the machines over IPMI to also select the OS to boot? And how? Thanks!

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  • Redhat 5.5: Multi-thread process only uses 1 CPU of the available 8

    - by Tonny
    Weird situation: Redhat Enterprise 5.5 (stock install, no updates, x64) on a HP z800 workstation. (Dual Xeon 2,2 Ghz. 8 cores, 16 if you count Hyper-threading. RH sees 16 cores.) We have an application that can utilize 1, 2 or 4 threads for heavy calculations. Somehow all these threads run on the same core at 100% load (the other 15 cores are nearly idle) so there is absolutely no benefit from the extra threads. In fact there is a slight slowdown as the threads get in each others way on the single core. How do I get them to run on separate cores (if possible)? Application is 64 bit. Can't change anything about the software except changing the threads setting. Is there some obscure Linux setting I can try to change? (I'm a True64 and Aix guy. I use Linux, but have no in depth knowledge of the process scheduling on Linux.)

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  • Multi language support in wireshark

    - by Ajay
    Do we have multiple language support with Wireshark. We are using Windows Xp SP2 and Ubuntu Linux environment. Actually we have a plugin which is UDP based and we have a requirement to Analyse the Information in Packet List Pane and Packet Details Pane to be viewed in other languages like French, German, Italian etc ... So is it possible with Wireshark version - 1.2.0. For e.g. Can we also have all the Menu Items etc ... all text in Wireshark which is there in English to be seen in French, German and Italian.

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  • What proportion of DBA skills are platform-independent?

    - by Arkaaito
    Problem: we've grown to the point where we need a real DBA. Real DBAs are hard to find. Possible solution: I know someone with extensive experience (currently working on MSSQL) who is looking for a new DBA job. He might be willing to consider working for a MySQL shop (I haven't asked). Snag: I don't know to what extent MSSQL DBA skills map to MySQL DBA skills. I'm a developer, so I know enough about MySQL to develop apps which use it (including the basic performance-tuning, index selection, etc.), do schema design, and perform simple utility tasks (backup with mysqldump, scripting, etc.). I don't know anything about MSSQL. Nor do I actually know much about the boundaries of the DBA role. Can anyone with more experience - perhaps as a DBA - weigh in on this? Are there enough similarities between MSSQL and MySQL that it's worth asking a MSSQL DBA if he'd be interested in applying for a MySQL position?

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  • Multi-core DVD ripping/encoding on the Mac

    - by Paul D. Waite
    A friend of mine likes ripping DVDs to his Mac. He’s currently on an ancient machine, and is about to upgrade to either a MacBook Pro or an iMac. Just wondering if any of the Mac DVD ripping software will rip faster on the iMac (thanks to its four cores), as opposed to the MacBook Pro (a measly two cores)? Or is DVD ripping not that sort of task?

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  • Multi-Role Domain Controllers for Small Offices (< 50 clients)

    - by kce
    Warning: I'm a Linux/*NIX admin so this is all new to me. I understand that it's not considered a good idea to have only a single domain controller, and that it is also probably a good idea for a domain controller to only do AD/DHCP/DNS (Here). We have two offices, location A with 30 users and location B with 10 users. Our two offices are separated by a WAN that is not particularly robust so I have be instructed that we need to have standalone services in each office. This means that according to "best practices" we will need to build a domain controller and a separate file server in each office. Again, I am not knowledgeable in the ways of Windows but this seems a little unnecessary for an organization of 40 users. People have commented that I could "get away with" running file services on the domain controller as long as the "load is light". That just seems to generate more questions than it answers. What constitutes light load? What are the potential consequences of mixing these roles? Ideally I would prefer to only have one physical machine at each location. The one in location A (the location with IT staff) can act as the primary domain controller and the one in the smaller office can act as the backup domain controller. If either domain controller fails we can still use the other one for authentication (albeit with some latency) and if the WAN connection fails each office still has access to their respective "local" domain controller. If the file services are ALSO run on each server (and synchronized with something like DFS), a similar arrangement in terms of redundancy can be had without having to purchase, build and install two additional separate servers. It's not that I'm adverse to that (well, any more adverse than I am to whole thing to begin with) but to my simple mind it just seems, well a bit overkill. I can definitely see the benefits of functional separation when we're talking larger organizations, but I need to consider the additional overhead too. None of this excludes having a DRP setup for the domain controller/s. I assume you can lose two domain controllers just as easily as one.

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  • Cross platform support for network attached USB hubs?

    - by larsks
    I am looking at network-attached USB hubs in order to run licensed software in a virtualized environment when hardware dongles are required. Are there any solutions that will work with both Linux and Windows? Most of the dedicated devices -- such as the Zonet ZUH2214 or the (oddly expensive) Digi AnywherUSB/2 -- appear to be Windows-only. Linux has the the USB/IP project, for which there appear to be Windows drivers, but the last "News" post on the site was in 2007, so I'm not entirely confident about the viability of the project. Has anyone out there found a solution that will work well in both environments?

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  • SSL with hosted multi-tenant apps

    - by ckarbass
    I have a website that let's users create a subdomain app like this: https://subdomain.mydomain.com I want them to be able to have the app appear as if it's on their site, like this: https://myapp.theirdomain.com or maybe https://theirdomain.com/myapp/ I'm using Heroku and was wondering if this is realistic and how the ssl certificate would be done such that it worked on both domains? If not, can I get it at least working on their domain?

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  • Mounting Replicated Gluster Multi-AZ Storage

    - by Roman Newaza
    I have Replicated Gluster Storage which is used by Auto scaling Servers. Both, Auto scaling and Storage are allocated in two Availability zones. Gluster: Number of Bricks: 4 x 2 = 8 Transport-type: tcp Bricks: Brick1: gluster01:/storage/1a # Zone A Brick2: gluster02:/storage/1b # Zone B Brick3: gluster03:/storage/2a # Zone A Brick4: gluster04:/storage/2b # Zone B Brick5: gluster01:/storage/3a # Zone A Brick6: gluster02:/storage/3b # Zone B Brick7: gluster03:/storage/4a # Zone A Brick8: gluster04:/storage/4b # Zone B I used Round Robin DNS for Gluster entry point, so DNS name resolves to all of the storage server addresses which are returned in different order all the time: # host storage.domain.com storage.domain.com has address xx.xx.xx.x1 storage.domain.com has address xx.xx.xx.x2 storage.domain.com has address xx.xx.xx.x3 storage.domain.com has address xx.xx.xx.x4 The Storage is mounted with Native Gluster Client: # grep storage /etc/fstab storage.domain.com:/storage /storage glusterfs defaults,log-level=WARNING,log-file=/var/log/gluster.log 0 0 I have heard Gluster might be mounted with the first Server IP and after that it will fetch its configuration with the rest of Servers. Personally, I never tested single Server mount setup and I don't know how Gluster handles this. On EC2, traffic among single Availability zone is free and between different zones is not. When Client in zone A writes to storage and IP of Storage in zone B is returned, it will cost me twice more for data transfer: Client (Zone A) - Storage Server (Zone B) - Replication to Storage Server (Zone A). Question: Would it be better to mount Storage Server of the same zone, so that data transfer charges apply only for replication (A - A - B)?

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  • Disabling partition just for one OS on multi-boot system

    - by Emiswelt
    Hi Regarding to the solution there: http://serverfault.com/questions/36385/how-can-i-mount-a-hard-drive-as-read-only-on-windows-xp I have a system with three partitions. One runs windows 7, one runs windows XP and is for some experimental programming and testing. I don't want to mess up anything, so I am going to disable the windows 7 partition like described on the linked page above from windows XP to protect the operating system. When I do this, is the windows 7 partition only disabled for the running XP os, or is the windows 7 partition rendered unbootable? with best regards

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  • Text-Editing program : muti-search-replace/multi-regex?

    - by rlb.usa
    I have a long and arduous text file, and I need to do lots and lots of the same search-replaces on it inside of selections. Is there a text editing program where I can do multiple find/replace (or regex) at one time? That is, I want to : (select text) - (do-find-replace-set-A) - (do other stuff) - (repeat) Instead of : (select text) - (f&r #1, f&r #2, f&r #3 ... ) - (do other stuff) - (repeat) I have textpad, but it's macro's won't handle find/replace.

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  • Multi-select menu in bash script

    - by am2605
    I'm a bash newbie but I would like to create a script in which I'd like to allow the user to select multiple options from a list of options. Essentially what I would like is something similar to the example below: #!/bin/bash OPTIONS="Hello Quit" select opt in $OPTIONS; do if [ "$opt" = "Quit" ]; then echo done exit elif [ "$opt" = "Hello" ]; then echo Hello World else clear echo bad option fi done (sourced from http://www.faqs.org/docs/Linux-HOWTO/Bash-Prog-Intro-HOWTO.html#ss9.1) However my script would have more options, and I'd like to allow multiples to be selected. So somethig like this: 1) Option 1 2) Option 2 3) Option 3 4) Option 4 5) Done Having feedback on the ones they have selected would also be great, eg plus signs next to ones they ahve already selected. Eg if you select "1" I'd like to page to clear and reprint: 1) Option 1 + 2) Option 2 3) Option 3 4) Option 4 5) Done Then if you select "3": 1) Option 1 + 2) Option 2 3) Option 3 + 4) Option 4 5) Done Also, if they again selected (1) I'd like it to "deselect" the option: 1) Option 1 2) Option 2 3) Option 3 + 4) Option 4 5) Done And finally when Done is pressed I'd like a list of the ones that were selected to be displayed before the program exits, eg if the current state is: 1) Option 1 2) Option 2 + 3) Option 3 + 4) Option 4 + 5) Done Pressing 5 should print: Option 2, Option 3, Option 4 and the script terminate. So my question - is this possible in bash, and if so is anyone able to provide a code sample? Any advice would be much appreciated.

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