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• How do you pick what server setup you need?

  - by ed209

  I recently started receiving pubsub data feed from etsy. It averages around 250 notifications per minute. But obviously, when the USA wakes up that spikes quite heavily. I want to be able to deal with those spikes (about 3 per day) but the rest of day is fine. What's the best method of getting the right server configuration. My current approach is to keep upgrading until the server stops dying... next leap is: Processor: AMD Phenom II X6-1055T HEXA Core RAM: 4GB DDR2 SDRAM HD1: SATA Drive (7,200 rpm) (+500 GB 7200 RPM SATA hard drive) HD2: SATA Backup Drive (+500 GB SATA (7,200 rpm)) OS: Linux OS (+CentOS 5 64-bit) Bandwidth: 6000GB Monthly Transfer (3000 in + 3000 out) (+100M uplink port) What's the best approach to working out what sort of server setup you need?

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• file:// command-line arguments

  - by Cory Grimster

  Is it possible to pass command-line arguments to a program that is invoked via a file:// url? I'm trying to include Remote Desktop links in a wiki page that lists some servers: <a href="file:///c|/windows/system32/mstsc.exe /v:serverName">serverName</a> When I omit the argument the link works fine, but when I include it the link doesn't work. I Googled around a bit and couldn't find any references to this. I suspect that the answer is that file:// urls simple don't accept arguments (I can think of all kinds of ways to abuse them if they do), but I thought I'd throw it out there in case I've simply got the syntax wrong. Thanks.

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• Is Ninite a trusuted solution for initial package management on fresh/clean install of Windows 7 64Bit?

  - by Donat

  I'd like to re-open the question from link below, where several packages were suggested besides Ninite.com such as allmyapps.com. Package managers for Windows What I'd like to know is if they are all to be trusted to install in Windows 7 (64bit) so that the manager: Installs the latest version of software. Supports 64 bit installs where possible. Strips ads/toolbars/similar stuff. The later two points from previous questions are good but not a priority in the preparation of a clean install Provides a way to keep the programs updated after installation. If I can add custom installers to the software, that's a big plus. I am more concerned here about using a legitimate application I can trust to establish the basis of clean image of my operating system with all the application of choice installed without fuss and spam/bloatware.

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• Returning a flexible datatype from a C++ function

  - by GavinH

  I'm developing for a legacy C++ application which uses ODBC for it's data access. Coming from a C# background, I really miss the ADO style of data access. I'm writing a wrapper (because we can't actually use ADO) to make our data access less painful. This means no char arrays, no manual text blob streaming, and no declaritive column binding. I'm struggling with how to store / return data values. In C# at least, you can declare an object and cast it to whatever (as long as the type is convertable). My current C++ solution is to use boost::any to store the data value in a custom DataColumnValue object. This class has conversion and assignment operators to the various types used in our app (more than 10). There's a bit of complexity here because if you store an int in the boost::any and try to boost::any_cast<long> you get a boost::bad_any_cast. Client objects shouldn't have to know how the value is stored internally. Does anyone have any experience trying to store / return values whose types are only known at runtime? Is there a better / cleaner way?

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• Is there any chance that my data will get silently corrupted with a robocopy SMB network transfer?

  - by Archagon

  I'm setting up a NAS box for the first time. At the moment, I have most of my data backed up to a few local hard drives, and I intend to transfer all the data to my NAS over ethernet once the RAID array is setup. Since this is all happening over the network, I'm a bit worried about my data getting corrupted silently during transfer. From what I understand, data generally doesn't get corrupted without notice on local transfers because a checksum is performed at some point by the drive or the OS. (This could be totally wrong.) Does the same thing happen with SMB, or is it up to the transferrer to check the integrity of their data? And if it doesn't happen with SMB, is there a protocol that does ensure data integrity? I know that rsync can checksum a transfer, but I'm on Windows and I already have a robocopy configuration that I like. Will my data be safe or do I have to use an external checksum tool to make sure?

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• Recovering database files from a corrupted VHD

  - by Apocalypse9

  We have a SQL server hosted on a virtual machine. Our hosting company updated/restarted the server and for some reason the virtual machines became unbootable. We've spoken to Microsoft and used a few higher level tools to attempt to recover the virtual machines but were unsuccessful. In browsing the file system the database folder doesn't even appear. I'm wondering if there are any lower level tools that might be able to find and copy the database files. As far as I know the physical hard drive is ok, so I'm hoping there may be some way to recover the files themselves even if the rest of the virtual machine file-system is a loss. Obviously we're in a bit of a bind, and any help/ suggestions are very much appreciated.

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• phpmyadmin error #2002 cannot connect to mysql server

  - by Joe

  so i am getting this error when trying to connect to my mysql server. i have reinstalled MYSQL and php several times and tried a slew of command line work from info around the web.mysql is running and i know that my mysql.sock exists and is located in ~/private/tmp/ and also in ~/tmp/. i also have plenty of hard drive space. i have installed and setup phpmyadmin correctly only adding a password to 'Password for config auth'. AND i have connected to the server via Sequel Pro. so my question is what the heck is going on that i can't connect to the server via phpmyadmin? any guesses? also i'm on a 64-bit intel mac running snow leopard

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• Sun Directory Server 5.2 performance

  - by tmow

  Hi all, I'm using logconv.pl (provided by Sun), to measure performance on my server. These two metrics results, are worrying me a bit: Binds: 192164 Unbinds: 111569 In fact the difference between the two it's quite big, how can I determine which are the unbound requests? As stated by Lodovic: Many applications just close the connections without sending an Unbind request. This simply can explain the difference. But the logconv.pl doesn't show details about the unbound requests, do you know any other tools or can you suggest some queries or whatever that can help me find out the root cause? Do you think anyway that the performances may improve fixing the issue?

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• Using robocopy and excluding multiple directories

  - by GorrillaMcD

  I'm trying to copy some directories from a server before I restore from backup (my latest backup was corrupt, so I have to use an older one :( ). I'm in the Windows Recovery Environment and have access to the server's file system G:\ and my backup media C:\. But, since I'm more familiar with Linux, I'm having a bit of trouble with the command line in Windows, specifically robocopy. I want to copy multiple directories (maintaining the same directory structure) from G:\ to C:\ while excluding others (namely, the Windows and Program Files folders). I can't figure out the syntax for the /XD option. I was hoping to do something like: robocopy G: C:\backup /CREATE /XD "dir1","dir2", ...

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• Making efficeint voxel engines using "chunks"

  - by Wardy

  Concept I'm currently looking in to how voxel engines work with a view to possibly making one myself. I see a lot of stuff like this ... https://sites.google.com/site/letsmakeavoxelengine/home/chunks ... which talks about how to go about reducing the draw calls. What I can't seem to understand is how it actually saves draw call counts on the basis of the logic being something like this ... Without chunks foreach voxel in myvoxels DrawIfVisible() With Chunks foreach chunk in mychunks DrawIfVisible() which then does ... foreach voxel in myvoxels DrawIfVisible() So surely you saved nothing ?!?! You still make a draw call for each visible voxel do you not? A visible voxel needs a draw call in either scenario. The only real saving I can see is that the logic that evaluates a chunk will be able to determine if a large number of voxels are visible or not effectively saving a bit of "is this chunk visible" cpu time. But it's the draw calls that interest me ... The fewer of those, the faster the application. EDIT: In case it makes any difference I will probably be using XNA (DX not OpenGL) for my engine so don't consider my choice of example in the link above my choice of technology. But this question is such that I doubt it would matter.

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• Data Access Objects old fashioned? [on hold]

  - by Bono

  A couple of weeks ago I delivered some work for a university project. After a code review with some teachers I got some snarky remarks about the fact that I was (still) using Data Access Objects. The teacher in question who said this mentions the use of DAO's in his classes and always says something along the lines of "Back then we always used DAO's". He's a big fan of Object Relational Mapping, which I also think is a great tool. When I was talking about this with some of my fellow students, they also mentioned that they prefer the use of ORM, which I can understand. It did make me wonder though, is using DAO's really so old fashioned? I know that at my work DAO's are still being used, but this is due to the fact that some of the code is rather old and therefor can't be coupled with ORM. We also do use ORM at my work. Trying to find some more information on Google or Stack Exchange sites didn't really enlighten me. Should I step away from the use of DAO's and only start implementing ORM? I just feel that ORM's can be a bit overkill for some simple projects. I'd love to hear your opinions (or facts) about this.

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• Experience with MooseFS?

  - by brown.2179

  Anyone have any experience using MooseFS? I want an easy distributed storage platform to store static data archive of about 10 TB and serve it to 20-40 nodes. Also I want to be able to add storage as the archive grows without having to rebuild the filesystem. I don't care if it's a bit slow. I just want it to be simple and stable. Basically from what I can see for OS X it's between MooseFS and Gluster. Any other suggestions?

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• How can I set Qmail to relay all mail to one address

  - by MoSiAc

  I'm new to qmail it's setup and working like it should. I need to set it to do something a bit different. I need it to take all mail that would be incoming to it and relay all of that to one address as opposed to whatever address they could have possibly set it to. The idea is we have setup a test enviroment and we want no e-mails from a test server to actually go out to real people so this relay server will catch all of that outgoing mail and throw it into a test e-mail account inbox to check for errors and so forth. I'm honestly not sure if this is even possible so if it's not let me know now so I can come up with a different method to manage all these test e-mails. Thanks

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• Looking for Unix tool/script that, given an input path, will compress every batch of uncompressed 100MB text files into a single gzip file

  - by newToFlume

  I have a dump of thousands of small text files (1-5MB) large, each containing lines of text. I need to "batch" them up, so that each batch is of a fixed size - say 100MB, and compress that batch. Now that batch could be: A single file that is just a 'cat' of the contents of the individual text files, or Just the individual text files themselves Caveats: unix split -b will not work here as I need to keep lines of text intact. Using the lines option is a bit complicated as there is a large variance in the number of bytes in each line. The files need not be a fixed size strictly, as long as it's within 5% of the requested size The lines are critical, and should not be lost: I need to confirm that the input made its way to output without loss - what rolling checksum (something like CRC32, BUT better/"stronger" in face of collisions) A script should do nicely, but this seems like a task someone has done before, and it would be nice to see some code (preferably python or ruby) that does atleast something similar.

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• User for Public Network

  - by user71604

  my computer can catch the signal for many Access Points for the same network, while the network has problem with internet connection in some APs and it's working in others "all APs have the same SSID" Please advice if as i user i can force my computer to connect with specific AP neither than to go with the one with higher power (through MAC adress or IP)?. I am sure that my computer catch more than 10 signals for APs"All with same SSID". I am using windows 7 home primume 64 bit. as a user i dont have access to the AP config.

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• Connecting two monitors at the corners

  - by fastmultiplication

  I am using two separate X screens on two monitors and I would like them to be connected at the lower right corner. That is, if you move to the lower right corner of screen0 the mouse should appear at the upper left of screen1. I do not want an entire edge of each monitor to be permeable to the mouse. I modified the xorg.conf file like so: Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 Screen 1 "Screen1" Relative "Screen0" 1200 1000 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" EndSection (screen 0's resolution is 1280x1024) so there is a bit of overlap. However whenever I move the mouse to the bottom of screen0, the pointer appears at the upper left of screen1. And, the entire top of screen1 is permeable to the mouse and brings it to the lower left corner of screen0. I have tried various numbers in following the "relative" statement - if I put 1280 1024 the mouse does not cross over at all. If I use 1280 1023 the entire right side of screen0 is permeable. I haven't been able to find any documentation about how to explicitly tell the mouse where to crossover - is there some? It seems that xorg is being really aggressive in guessing where the mouse crossover should take place. Does anyone know how to do this? Thanks!

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• Object desing problem for simple school application

  - by Aragornx

  I want to create simple school application that provides grades,notes,presence,etc. for students,teachers and parents. I'm trying to design objects for this problem and I'm little bit confused - because I'm not very experienced in class designing. Some of my present objects are : class PersonalData() { private String name; private String surename; private Calendar dateOfBirth; [...] } class Person { private PersonalData personalData; } class User extends Person { private String login; private char[] password; } class Student extends Person { private ArrayList<Counselor> counselors = new ArrayList<>(); } class Counselor extends Person { private ArrayList<Student> children = new ArrayList<>(); } class Teacher extends Person { private ArrayList<ChoolClass> schoolClasses = new ArrayList<>(); private ArrayList<Subject> subjects = new ArrayList<>(); } This is of course a general idea. But I'm sure it's not the best way. For example I want that one person could be a Teacher and also a Parent(Counselor) and present approach makes me to have two Person objects. I want that user after successful logging in get all roles that it has (Student or Teacher or (Teacher & Parent) ). I think I should make and use some interfaces but I'm not sure how to do this right. Maybe like this: interface Role { } interface TeacherRole implements Role { void addGrade( Student student, Grade grade, [...] ); } class Teacher implements TeacherRole { private Person person; [...] } class User extends Person{ ArrayList<Role> roles = new ArrayList<>(); } Please if anyone could help me to make this right or maybe just point me to some literature/article that covers practical objects design.

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• How can I create a bootable DVD iso from a USB drive?

  - by Kiada

  There seems to be a lot of questions / answers about doing the reverse, but not as much info for USB - DVD. Problem I created a bootable USB drive using YUMI. The USB drive is working great, and contains the following: Linux Mint 13 Linux Mint Debian Debian 6 Ubuntu 12.04.1 Fedora 17 A bit of a mix of DVD and Live versions. I have a spindle of DVD+R DL blank DVD's. I would like to create a bootable .iso from this USB drive so I can burn multiple copies of it to pass around to friends! I've created an iso using Folder2ISO, but it coastered my DVD because it wasn't bootable. I don't really want to waste a whole spindle! How would you go about doing such a thing?

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• How often do you look for code examples?

  - by Newly Insecure

  I am a comp sci student with several years of experience in C and C++, and for the last few years I've been constantly working with Java/Objective C doing app dev and now I have switched to web dev and am mainly focused on ruby on rails and I came to the realization that (as with app dev, really) I reference other code wayyyy too much. I constantly google functionality for lots of things I imagine I should be able to do from scratch and it's really cracked my confidence a bit. Basic fundamentals are not an issue, I hate to use this as an example but I can run through javabat in both java/python at a sprint - obviously not an accomplishment and but what I mean to say is I have a strong base for the fundamentals I think? I was wondering how often you guys reference other code and does it just boil down to a lack of memorization of intricate tasks on my part? I know what I need to use typically but reference syntax constantly. Would love some advice and input on this, as it has been holding me back pretty solidly in terms of looking for work in this field even though I'm finishing my degree. My main reason for asking is not really about employment, but more that I don't want to be the only guy at a hackathon not hammering out nonstop code and sitting there with 20 google/github tabs open, and I have refrained from attending any due to a slight lack of confidence... tl;dr: I google for code examples for basically ALL semi advanced/advanced functionality, how to fix this and do you do as well?

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• Windows 7 migration: How to move application settings?

  - by FrustratedWithFormsDesigner

  Migrating from WindowsXP Home to Windows 7 Pro. The last bit that I'm stuck on is migrating application settings, such as the settings for Opera, Firefox, MSN Messenger, and others. On the XP system, this all seems to be in "user/Local Settings" and "user/Application Data". On the Windos 7 system, there is a "user/AppData" folder as well as "user/Application Data" and "user/Local Settings". When I try to access "Application Data" and "Local Settings" on Windows 7, I get an "Access Denied" error (even though my user is an admin). So... if I can't copy my application settings files to "Application Data" and "Local Settings" on Windows 7, where to I copy them to?

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• Game planning and software design? I feel that UML is not convenient

  - by user1542

  In my university, they always emphasize and hype about UML design and stuff, in which I feel it is not going to work well with game structure design. Now, I just want a professional advice on how should I begin my game designing? The story is I have some skill in programming and have done many minor game such as getting some 2D platformer working to some extend. The problems that I find about my program is the poor quality design. After coding for a while, things start to break down due to poor planning (When I add new feature, it tends to make me have to recode the whole program). However, to plan everything out without a single design flaw is a bit too ideal. Therefore, any advice to how should I plan my game? How should I put it into visible pictures, so that me and my friends are able to overview the designs? I planned to start coding a game with my friend. This is going to be my first teamwork, so any professional advices would be a pleasure. Is there any other alternatives than UML? Another question is how does "prototyping" normally looks like?

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• Windows equivalent for Linux "screen" or another alternative?

  - by Ubha

  Hello all! I'm on the lookout for a method to control programs in a Windows environment. I would prefer it to be a bit similar to the Linux software "screen". The reason of my search is that I need to start a program (on Windows) with an identifier, so I later would be able to close that specific program, without closing anything else - even though the actual program (.exe file) is running multiple times. So is there anyway I can "name" it? I'm using the following on Linux now: $ screen <params> <id> ./softwareprogram And then I know I can always find it with it's ID :) It's an external program which is closing or starting a 3rd party program. My program is written in C++, if that does any difference. Thanks :)

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• Prevent Nautilus from displaying thumbnails on a specific mount

  - by Zakhar

  I have written a filesystem over Fuse to access a remote pseudo-NAS (the French "Freebox V6", I'll soon publish it as GPL3... when it's a little bit more polished!). The NAS is connected to a home ADSL, thus data comes down at the upload speed of ADSL, which is at best 1Mbps. My mount works fine (read-only at the moment), but Nautilus sees the mountpoint (and all sub-directories) as a "local" filesystem and tries to make thumbnails. As I have a directory full of images, this is quite horrible, because Nautilus then opens ALL the images to try to display the thumbnail. I could switch the Nautilus preferences to "Never" for thumbnails, but then I'll loose thumbnails on my "real" local filesystem. So the question is: with the preference "Only for local filesystem", how can I instruct Nautilus that my mountpoint is in fact NOT a local mount so that it will stop trying to draw thumbnails on that specific mount, but continue "thumbnailing" on mounts that are really local? Edit note: the same things happens if you use "standard worldwide" mounts such as sshfs, davfs,... as long as you mount over a relatively slow network (ADSL) and have images/movies on your mounted tree.

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• How should I compress a file with multiple bytes that are the same with Huffman coding?

  - by Omega

  On my great quest for compressing/decompressing files with a Java implementation of Huffman coding (http://en.wikipedia.org/wiki/Huffman_coding) for a school assignment, I am now at the point of building a list of prefix codes. Such codes are used when decompressing a file. Basically, the code is made of zeroes and ones, that are used to follow a path in a Huffman tree (left or right) for, ultimately, finding a byte. In this Wikipedia image, to reach the character m the prefix code would be 0111 The idea is that when you compress the file, you will basically convert all the bytes of the file into prefix codes instead (they tend to be smaller than 8 bits, so there's some gain). So every time the character m appears in a file (which in binary is actually 1101101), it will be replaced by 0111 (if we used the tree above). Therefore, 1101101110110111011011101101 becomes 0111011101110111 in the compressed file. I'm okay with that. But what if the following happens: In the file to be compressed there exists only one unique byte, say 1101101. There are 1000 of such byte. Technically, the prefix code of such byte would be... none, because there is no path to follow, right? I mean, there is only one unique byte anyway, so the tree has just one node. Therefore, if the prefix code is none, I would not be able to write the prefix code in the compressed file, because, well, there is nothing to write. Which brings this problem: how would I compress/decompress such file if it is impossible to write a prefix code when compressing? (using Huffman coding, due to the school assignment's rules) This tutorial seems to explain a bit better about prefix codes: http://www.cprogramming.com/tutorial/computersciencetheory/huffman.html but doesn't seem to address this issue either.

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• Getting started with VNC

  - by Stephen

  I have subscribed to a VPS service for the purpose of running some remote applications. To do this I'm going to need a remote desktop of one sort or another. With this in mind it was suggested that I try Ubuntu. The installation that was prepared for me was Ubuntu 11.10 64 bit (Ubuntu 11.10 (GNU/Linux 2.6.18-348.4.1.el5.028stab107.1 x86_64)) From here I used apt-get install ubuntu-desktop which completed successfully. I rebooted the machine and reconnected via ssh. When I attempt to connect from TightVNC on my Windows machine I get a message about the session being actively refused. What should I do to confirm the service is running? Do I need to setup a firewall rule to allow the ports to pass through? (I am a linux newb so explicitness is appreciated)

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