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• Data Archiving vs not

  - by Recursion

  For the sake of data integrity, is it wiser to archive your files or just leave them unarchived. No compression is being used. My thinking is that if you leave your files unarchived, if there is some form of corruption it will only hurt a smaller number of files. Though if you archive, lets say all of your documents, if there is even the slightest corruption, the entire archive is unrecoverable. So whats the best way to keep a clean file system, but not be subject to data corruption.

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• Splicing from a weird DVD-format

  - by User1

  I have a DVD full of video clips. I want to exact only some of these clips. I tried to use mplayer/mencoder's nice feature of Edit Decision List (EDL). However, the video timer seems to constantly reset with each video clip (less than 20 seconds) and its EDL does not have a video clip number or anything like that. I've tried using VLC to extract the video into an MPG file, but the same timer problem persists. What's a good way to splice out part of these clips from the DVD? I'm willing to write a small program in any language to make this work.

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• Freebsd Box hangs on boot loader

  - by user19039

  I have a freebsd box that seems to not want to boot past the boot loader. It wont go past the initial boot loader phase and just lists the version number for the boot loader(btx loader). It hangs there. I am not a fluent freebsd admin and decent at command line, however I can tell clearly it wont get past and boot past the disk. Loaded up rescue cd, mounted the drive. Couldnt get fsck going without seg faulting How do i get this fixed? I have a live cd.... just curious which route to take.

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• Suggestions for a Self-serv advertising service

  - by Mystere Man

  I am seeking a self-serv advertising service for my websites, but I have a few restrictions that seem to make what i'm looking for hard to find. Specifically, I want to place "advertise here" links on my pages and allow end-users to purchase advertising on that site, page, and location. These ads will not be part of a national network. Supports multi-tenancy - That is, I have a number of domains using the same "web application" but with customized content per domain. When a customer wants to advertise on a given domain, then the ads will only appear on that domain and on that page of the domain (even though the page name may be the same across multiple domains). Supports fixed ad prices, not just CPC. I need monthly and quarterly pricing regardless of performance. Integrates with OpenX and other ad networks, so that if there is no self-serv on a given zone, it will use national advertising or direct advertising. Shiny Ads has much of this, but i'm looking for alternatives, as their prices are a bit crazy (20%) and can only do PayPal.

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• Understanding dot notation

  - by Starkers

  Here's my interpretation of dot notation: a = [2,6] b = [1,4] c = [0,8] a . b . c = (2*6)+(1*4)+(0*8) = 12 + 4 + 0 = 16 What is the significance of 16? Apparently it's a scalar. Am I right in thinking that a scalar is the number we times a unit vector by to get a vector that has a scaled up magnitude but the same direction as the unit vector? So again, what is the relevance of 16? When is it used? It's not the magnitude of all the vectors added up. The magnitude of all of them is calculated as follows: sqrt( ax * ax + ay * ay ) + sqrt( bx * bx + by * by ) + sqrt( cx * cx + cy * cy) sqrt( 2 * 2 + 6 * 6 ) + sqrt( 1 * 1 + 4 * 4 ) + sqrt( 0 * 0 + 8 * 8) sqrt( 4 + 36 ) + sqrt( 1 + 16 ) + sqrt( 0 + 64) sqrt( 40 ) + sqrt( 17 ) + sqrt( 64) 6.3 + 4.1 + 8 10.4 + 8 18.4 So I don't really get this diagram: Attempting with sensible numbers: a = [1,0] b = [4,3] a . b = (1*0) + (4*3) = 0 + 12 = 12 So what exactly is a . b describing here? The magnitude of that vector? Because that isn't right: the 'a.b' vector = [4,0] sqrt( x*x + y*y ) sqrt( 4*4 + 0*0 ) sqrt( 16 + 0 ) 4 So what is 12 describing?

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• Blocking IP address with port forwarding

  - by Jeff Storey

  I have a website setup behind a router, so the router has the external facing address and it will forward requests to the webserver inside the network. If there are X number of invalid login attempts, that IP address will be blocked from logging in. The problem is that because the site is being accessed through port forwarding, all requests show up as though they are coming from the router address, and thus the router address becomes the blocked IP. I'm not sure if this is a limitation of the router (linksys wrt160n) or if this a more general issue. Is there a way to handle this?

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• Is it usual if my employer asks me to get MCP certificates for higher salary?

  - by Vimvq1987

  I just got a salary negotiation this morning (I passed three interviews last 3 weeks), and it was like a game. I was stubborn with my expectation, or that number, or I leave. OK, to be honest, it's not about money, but I, a not-very-experienced developer, want to see how much the employer pays me, and it was fun. And at last, my employer gave me this: "OK, * $, but with two conditions, first, you get your spoken skill improved (English is not my native), and second, you got MCPs before the end of the year". He asked me to get 3 MCP certificates. The company will buy any books that necessary to the exam, but I must read them at free time, take and pass the exams . If I not get them, my employer will not kick me out, but, salary discussion will be harder, for me. I accepted that offer, I thought it's good enough. But I wonder, is it usual? If you're an employer, have you ever given that offer to a candidate? If you're an employee, have you ever got, or will you accept an offer like that?

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• Most efficient Implementation a Tree in C++

  - by Topo

  I need to write a tree where each element may have any number of child elements, and because of this each branch of the tree may have any length. The tree is only going to receive elements at first and then it is going to use exclusively for iterating though it's branches in no specific order. The tree will have several million elements and must be fast but also memory efficient. My plan makes a node class to store the elements and the pointers to its children. When the tree is fully constructed, it would be transformed it to an array or something faster and if possible, loaded to the processor's cache. Construction and the search on the tree are two different problems. Can I focus on how to solve each problem on the best way individually? The construction of has to be as fast as possible but it can use memory as it pleases. Then the transformation into a format that give us speed when iterating the tree's branches. This should preferably be an array to avoid going back and forth from RAM to cache in each element of the tree. So the real question is which is the structure to implement a tree to maximize insert speed, how can I transform it to a structure that gives me the best speed and memory?

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• Does F# kill C++?

  - by MarkPearl

  Okay, so the title may be a little misleading… but I am currently travelling and so have had very little time and access to resources to do much fsharping – this has meant that I am right now missing my favourite new language. I was interested to see this post on Stack Overflow this evening concerning the performance of the F# language. The person posing the question asked 8 key points about the F# language, namely… How well does it do floating-point? Does it allow vector instructions How friendly is it towards optimizing compilers? How big a memory foot print does it have? Does it allow fine-grained control over memory locality? Does it have capacity for distributed memory processors, for example Cray? What features does it have that may be of interest to computational science where heavy number processing is involved? Are there actual scientific computing implementations that use it? Now, I don’t have much time to look into a decent response and to be honest I don’t know half of the answers to what he is asking, but it was interesting to see what was put up as an answer so far and would be interesting to get other peoples feedback on these questions if they know of anything other than what has been covered in the answer section already.

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• two-part dice pool mechanic

  - by bythenumbers

  I'm working on a dice mechanic/resolution system based off of the Ghost/Echo (hereafter shortened to G/E) tabletop RPG. Specifically, since G/E can be a little harsh with dealing out consequences and failure, I was hoping to soften the system and add a little more player control, as well as offer the chance for players to evolve their characters into something unique, right from creation. So, here's the mechanic: Players roll 2d12 against the two statistics for their character (each is a number from 2-11, and may be rolled above or below depending on the nature of the action attempted, rolling your stat exactly always fails). Depending on the success for that roll, they add dice to the pool rolled for a modified G/E style action. The acting player gets two dice anyhow, and I am debating offering a bonus die for each success, or a single bonus die for succeeding on both of the statistic-compared rolls. One the size of the dice pool is set, the entire pool is rolled, and the players are allowed to assign rolled dice to a goal and a danger. Assigned results are judged as follows: 1-4 means the attempted goal fails, or the danger comes true. 5-8 is a partial success at the goal, or partially avoiding the danger. 9-12 means the goal is achieved, or the danger avoided. My concerns are twofold: Firstly, that the two-stage action is too complicated, with two rolls to judge separately before anything can happen. Secondly, that the statistics involved go too far in softening the game. I've run some basic simulations, and the approximate statistics follow: 2 dice (up to) 3 dice (up to) 4 dice failure ~33% ~25% ~20% partial ~33% ~35% ~35% success ~33% ~40% ~45% I'd appreciate any advice that addresses my concerns or offers to refine my simulation (right now the first roll is statistically modeled as sign(1d12-1d12), where 0 is a success).

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• I have an MIS degree. How do I sell myself as a programmer?

  - by hydroparadise

  So, I graduated with a BSBA in Management Information Systems with honors almost 2 years ago which is more of a business degree. As of right now, I do have a job title of "Programmer", but it's more of a report writing position in an arbitrary, proprietary language called PowerOn with the occasional interesting project using more mainstream technologies like .Net and Java. I am also somewhat isoloated being the only programmer in the workplace, which I beleive is a detriment to my career path. The only people I have to bounce ideas against are those on the various SE sites. I don't regret going MIS, but over the past couple of years I have discovered my passion for coding, even though I have been doing some form of coding profesionally and as an enthusiast for years. I do want to persue my Masters in CS (at a later time), but I am not sure if I necessarily need a CS degree to get in with a team of programmers. In addition, I do have a number classes I have taken for different laguanges on the way (C++, Java, SQL, and VB.Net) I beleive my strength is in problem solving where code is just a tool to tackling to problem if needed. My question: How do I best sell myself as a programmer? Should I continue pounding out reports and wait till I have my masters in CS? Or am I viable to be a programmer as I stand?

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• How can I compare effective power usage of two CPUs / CPU+Mobo+Mem combinations?

  - by einpoklum

  I have this server which does mostly file sharing (with the associated storage). No serious number crunching and it isn't the firewall. My current box has a Celeron D processor (Prescott 336 2.8 GHz); and I'm considering replacing it with a Pentium D (Smithfield 805 2.66 GHz) - for reasons which do not involve performance. How can I know whether one can expect a higher or lower power consumptipn for the change? And how can I estimate the power consumption for each option?

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• Assuming "clean code/architecture" is there a difference in "effort" between PHP or Java/J2EE web application development?

  - by PhD

  A client asked us to estimate effort when selecting PHP as the implementation language for his next web-based application. We spent about a week exploring PHP, prototyping, testing etc., We are quite new to this language - may have hacked around it in the past but, let's go with PHP-noobs but application development experts (for the lack of a better, less flattering word :) It seems, that if we write, clean maintainable code, follow separation of concerns, enterprise architecture patters (DAOs etc.) the 'effort' in creating an object-oriented PHP based web-application seems to be the same for a Java based one. Here's our equation for estimating the effort (development/delivery time): ConstructionEffort = f(analysis, design, coding, testing, review, deployment) We were specifically comparing effort estimates in creating an enterprise application with the following: PHP + CakePHP/CodeIgniter (should we have considered others?) Java + Spring + Restlet It's an end-to-end application: Client: Javascript/jQuery + HTML/CSS Middle tier/Business Logic - (Still evaluating PHP/Java) Database: MySQL The effort estimates of the 1st and 3rd tier are constant and relatively independent of the middle tier's technology. At a high level with an initial breakdown into user stories of the requested features as well as a high-level SWAG on the sheer number of classes/SLOC that would be required for PHP doesn't seem to differ by much from what is required of the same in Java. Is this correct? We are basing our initial estimates on the initial prototyping/coding we've done with PHP - we are currently disregarding fluency with the language as a factor, since that'll be an initial hurdle and not a long term impediment IMHO (we also have sufficient time to become quite fluent with PHP). I'm interested in knowing the programmers' perspective with respect to effort when creating similar applications with either of the languages to justify choosing one over the other. Are we missing something here? It seems we are going against popular belief of PHP being quicker to market (or we being very fluent with Java have our vision clouded). It doesn't seem to have any coding/programming effort saving from what we/ve played around with.

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• How to represent a graph with multiple edges allowed between nodes and edges that can selectively disappear

  - by Pops

  I'm trying to figure out what sort of data structure to use for modeling some hypothetical, idealized network usage. In my scenario, a number of users who are hostile to each other are all trying to form networks of computers where all potential connections are known. The computers that one user needs to connect may not be the same as the ones another user needs to connect, though; user 1 might need to connect computers A, B and D while user 2 might need to connect computers B, C and E. Image generated with the help of NCTM Graph Creator I think the core of this is going to be an undirected cyclic graph, with nodes representing computers and edges representing Ethernet cables. However, due to the nature of the scenario, there are a few uncommon features that rule out adjacency lists and adjacency matrices (at least, without non-trivial modifications): edges can become restricted-use; that is, if one user acquires a given network connection, no other user may use that connection in the example, the green user cannot possibly connect to computer A, but the red user has connected B to E despite not having a direct link between them in some cases, a given pair of nodes will be connected by more than one edge in the example, there are two independent cables running from D to E, so the green and blue users were both able to connect those machines directly; however, red can no longer make such a connection if two computers are connected by more than one cable, each user may own no more than one of those cables I'll need to do several operations on this graph, such as: determining whether any particular pair of computers is connected for a given user identifying the optimal path for a given user to connect target computers identifying the highest-latency computer connection for a given user (i.e. longest path without branching) My first thought was to simply create a collection of all of the edges, but that's terrible for searching. The best thing I can think to do now is to modify an adjacency list so that each item in the list contains not only the edge length but also its cost and current owner. Is this a sensible approach? Assuming space is not a concern, would it be reasonable to create multiple copies of the graph (one for each user) rather than a single graph?

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• Looking for temporal upsampling / motion interpolation software

  - by timday

  I'm looking for something (prereably FOSS software) which can take an animation with N images as input, and which will output an animation with M frames, where M is in the range 2N to 5N or so. I believe the general technique is called "temporal upsampling" or possibly "inbetweening" (or "'tweening" for short). Note that it does need to make some effort to do motion tracking of things in the scene ("optical flow"); just fading ("dissolve") between keyframes isn't going to cut it. Googling "temporal upsampling" turns up any number of papers on the subject, but I've yet to discover any code/software (a gstreamer plugin would be perfect) I can just use to try the technique out. Any suggestions ? Additional information: "Motion interpolation" seems to be the more widely used name in the TV world for what I'm looking for. See this and the video here too. Interestingly, some cinephiles seem to hate what these technologies do to 24FPS film: e.g a comment "makes Gone With The Wind look like a soap opera shot on video".

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• Is it possible to change error messages for users connecting to network printers?

  - by eric.s

  We are cleaning up our print server (Win XP). To test that printers are no longer really there we have set up some tests. These tests have left us with 176 questionable printers. We have now set Print access to Everyone to Deny. Testing shows this gives the user a 5 Access is denied. message. We would like to change this message for the user, so when they call our workstudy's who answer the phone do not interpret this as a computer rights management issue and can route the call properly. Is it possible? Is this error number system wide, or just for printing errors? If it's not a system wide error where might the string for this error be?

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• Connecting to a DLNA server in Vista's Media Centre

  - by Basic

  I've got a Windows 7 machine with a DLNA server set up. I can stream from it to my mobile and a number of other devices with no issues. All clients are auto-authorised so no permissions issues either. I have a Vista laptop on the network which I'd like to use to play back some of the videos. I can see the media server in the network view, if I double-click it, I can see the server in Windows Media Player. I can't find any way to add a DLNA source to Windows Media Centre, though. Where's the setting hidden?

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• Which SATA controller is better to use with Windows Server 2008 R2 64 bit?

  - by at8eqeq3

  We're preforming some hardware upgrade on our server machines. As a part of this process, we have to install some additional disk drives. Unfortunately, total number of drives will become 7 or 8, while all of our motherboards have only 6 SATA ports. Obviously, we need additional disk controllers. For now, we've tested Silicon Image (actually, no-name) and Adaptec controllers, both on SiI3132 chip, and got some problems with drivers for them: Silicon Image drivers are not installing at all, and Adaptec ones are installing, but the system says they're not signed and becomes unbootable. We're tryed both drivers from controllers' CD's and latest versions from manufacturers' websites, and no luck. So, can you recommend some SATA controllers that will really work without tambourine dances on mentioned OS (we need just 2 SATA ports and PCI-E, while RAID and any other features are no-matter)? Thanks for any help.

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• Notification if SyncToy fails

  - by Joel Coehoorn

  I support a number of laptop users. In the past (before there were many laptops), each user's computer was set up so that their My Documents folder was mapped to a shared folder on the server. This worked very well for desktops, but has several obvious downsides for laptops (no files when you're off-site, etc). I'm exploring several alternatives for laptops to better map the shared drives, and SyncToy seems the best so far. I have a couple trial users set up so that it syncs automatically whenever they log in, along with a desktop icon they can click if they know they'll need something saved before the next login. My problem is that I'm concerned how I, as the maintainer of this system, can spot failures. I don't want my first indication of a problem to come after a user drops their laptop in a lake and it turns out nothing was synced for the last year. Any ideas?

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• Why does my root filesystem keep becoming read-only?

  - by Scott Severance

  I've lately been having an issue with my root filesystem becoming readonly. It happens some amount of time after boot. I don't know exactly when it happens, as I don't usually notice it until something such as suspending the computer or printing fails. It seems to be fairly random. Since most of my system is on that partition, I can't re-mount it without rebooting. After this happens, the system runs a fsck. Sometimes it prompts to fix problems; other times it apparently finds none. To troubleshoot, I've searched through the logs but found nothing relevant. This might be due in part to not knowing when the actual errors took place. The filesystem is apparently good to begin with, as when fsck runs its fixes it doesn't report any errors. I've scanned the disk with SpinRite. A while ago, SpinRite found and recovered from some bad sectors on the hard drive. I ran a level 4 scan (a thorough scan) after this probem appeared, but SpinRite found nothing. The SMART data reports that the disk is OK with 63 bad sectors. The number of bad sectors hasn't changed recently. I realize that the disk isn't in the best of conditions, and I have complete backups in case of catastrophic failure. Yet the lack of errors in the logs, combined with SpinRite's test results and the unchanged SMART data makes me think that this problem has some cause other than disk failure. Other than disk failure, what could cause my symptoms?

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• Forward requests to IIS Application/Folder to Apache server on another port

  - by TheGwa

  I have found many questions and answers for ways of doing this using asapi filters or ARR and URL Rewrite, but none are clear and concise and I am sure many people have this issue. I am looking for a best practice step by step solution to the following scenario: I have a development server accessible externally via a specific port for testing. Eg. rnd.domain.com:8888. So there is one port in and out of this machine accessible to the world. On this server I have a number of Apache or other servers using specific ports such as 8080. IIS is bound to port 80 locally as well as 8888 to get external requests and works perfectly. I would like to use an application (folder) in IIS such as rnd.domain.com:8888/mapserver to map to the local apache server in both directions. The same solution must apply in production where the domain is mapped to port 80. eg. production.domain.com/mapserver maps to 8080 on production server

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• You wouldn&rsquo;t drink 9 year old milk would you?

  - by Jim Duffy

  This is an absolutely brilliant campaign to urge users that its time to move on from IE 6. I like how it puts it terms that everyone can understand and has probably experienced at one time or another. How many times have you opened the milk, took a sniff, and experienced that visceral reaction that accompanies catching a whiff of milk that has turned to the dark side of the force? I call it Darth Vader milk. :-) Of course I’m assuming that you haven’t used IE 6 for a long time now. It is our responsibility as information technology workers to communicate to our friends and family how lame using IE 6 is. Shame them into upgrading if necessary. I don’t care how you get through to them but get through. Tell them that only losers use IE 6. Tell them you’ll cut them out of the your will. Tell them they’re banned from your annual BBQ blowout. Tell them that [insert their favorite celebrity’s name here] thinks people using IE6 are losers.  :-) Seriously, IE6 sucks and blows at the same time and has got to go for a number of reasons including the security leaks that come with using it. Confidentially, I urge them to upgrade for purely selfish reasons. Because I am the first level of computer support for waaaaaay to many of my family members I always advocate they use a current browser (IE 8 or Firefox) and anti-virus software (AVG). Call me selfish but I’d rather not waste my time dealing with a virus or malware that could potentially slip through with IE6. Yes, I’m selfish with my time that way. :-) Have a day. :-|

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• Optimal dir strcuture for keeping millions of files on an ext4 system

  - by Alex Flo

  I need to keep millions of files on an ext4 system. I understand that having a structure with multiple subdirectories is the general accepted solution. I wonder what would be the optimal approach in terms of number of dirs/subdirs. For example I tried a structure like 16/16/16/16 (that is, (sub)directories from 1 to 16) and I found that I am able to move 100K files to this structure in 2m50s. When trying to move 100K files to a 8/8/8/8/8/8 structure it took 11 minutes. So the 16/16/16/16 approach seems to be better but I was wondering if anyone has some empirical experience with an even better dir/subdir distribution.

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• Can Windows XP remember file icon position?

  - by g .

  Windows allows you to arrange icons however you like in a window. However after some time when I go back to the window, it has forgotten the icon positions and has completely rearranged the icons. Is there a way to preserve the icon positions? In the previous version of Windows I used, this would happen on rare occasions (about 6 months) and it might only move a couple of icons. Now it is happening practically every day and it is every single icon. Attempts to rearrange them manually are futile and it is increasingly maddening. Searching Google, I have found a number of programs that allow you to save and restore icon position on the desktop. But, this is just a regular folder window so I am not sure if any of those would even work. Some details: Windows XP SP 3 running in Parallels 5 virtual machine Auto Arrange and Align to Grid are NOT turned on Fresh OS install and only setting icon positions in one window

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• Can certain system-hungry modules be disabled in Ubuntu?

  - by Ole Thomsen Buus

  Hi, Let me add some context: I am currently using Ubuntu 9.10 64-bit (Desktop) on a relatively powerful stationary PC (Intel Core i7 920, 12GB ram). My purpose is highspeed imaging with a pointgrey Grashopper machine-vision camera (for research, PhD project). This camera is capable of 200 fps at full VGA (640x480) resolution. The camera is connected using Firewire (1394b) and the drivers and software from Pointgrey works great. I have developed a console C++ application that can grap a certain number of frames to preallocated memory and after this also save the grapped frames to harddrive. Currently it works fine but sometimes I am observing a few framedrops (1-3). When this happens I reset the experiment and repeat the recording and usually i am lucky the second time with no framedrops (the camera-driver has a internal framecounter that I am using). Question: I usually go to tty1 and use "sudo service gdm stop" to disable the graphical frontend. It seems to release some memory though that is not my main concern. My concern is CPU resources. Are there other system hungry modules that can be disabled temporarily such that the CPU gets less busy on Ubuntu 9.10? At some point in the future I will update to 10.10. Should I perhaps option for the server edition instead? Thanks.

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