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• Understanding the maximum hit-rate supported by a web-server

  - by SNag

  I would like to crawl a publicly available site (and one that's legal to crawl) for a personal project. From a brief trial of the crawler, I gathered that my program hits the server with a new HTTPRequest 8 times in a second. At this rate, as per my estimate, to obtain the full set of data I need about 60 full days of crawling. While the site is legal to crawl, I understand it can still be unethical to crawl at a rate that causes inconvenience to the regular traffic on the site. What I'd like to understand here is -- how high is 8 hits per second to the server I'm crawling? Could I possibly do 4 times that (by running 4 instances of my crawler in parallel) to bring the total effort down to just 15 days instead of 60? How do you find the maximum hit-rate a web-server supports? What would be the theoretical (and ethical) upper-limit for the crawl-rate so as to not adversely affect the server's routine traffic?

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• Twice as long and half as long

  - by PointsToShare

  We are in a project and we hit some snags. What’s a snag? An activity that takes longer than expected. Actually it takes longer than the time assigned to it by an over pressed PM who accepts an impossible time table and tries his best to make it possible, but I digress (again!).  So we have snags and we also have the opposite. Let’s call these “cinches”. The question is: how does a combination of snags and cinches affect the project timeline? Well, there is no simple answer. It depends on the projects dependencies as we see in the PERT chart. If all the snags are in the critical path and all the cinches are elsewhere then the cinches don’t help at all. In fact any snag in the critical path will delay the project.  Conversely, a cinch in the critical path will expedite it. A snag outside the critical path might be serious enough to even change the critical path. Thus without the PERT chart, we cannot really tell. Still there is a principle involved – Time and speed are non-linear! Twice as long adds a full unit, half as long only takes ½ unit away. Let’s just investigate a simple project. It consists of two activities – S and C - each estimated to take a week. Alas, S is a snag and really needs twice the time allotted and – a sigh of relief – C is a cinch and will take half the time allotted, so everything is Hun-key-dory, or is it?  Even here the PERT chart is important. We have 2 cases: 1: S depends on C (or vice versa) as in when the two activities are assigned to one employee. Here the estimated time was 1 + 1 and the actual time was 2 + ½ and we are ½ week late or 25% late. 2: S and C are done in parallel. Here the estimated time was 1, but the actual time is 2 – we are a whole week or 100% late. Let’s change the equation a little. S need 1.5 and C needs .5 so in case 1, we have the loss fully compensated by the gain, but in case 2 we are still behind. There are cases where this really makes no difference. This is when the critical path is not affected and we have enough slack in the other paths to counteract the difference between its snags and cinches – Let’s call this difference DSC. So if the slack is greater than DSC the project will not suffer. Conclusion: There is no general rule about snags and cinches. We need to examine each case within its project, still as we saw in the 4 examples above; the snag is generally more powerful than the cinch. Long live Murphy! That’s All Folks

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• How do I dynamically assign the Model for a .find in Ruby on Rails?

  - by Angela

  I am trying to create a Single Table Inheritance. However, the Controller must be able to know which class to find or create. These are based on another class. For example, ContactEvent with type = Letter needs to grab attributes from a corresponding Model called Letter. Here's what I've tried to do and hit a snag, labelled below. I need to be able to dynamically call assign a value of EventClass so that it can be Letter.find(:conditions =) or Calls.find(:conditions =) depending on which type the controller is acting on. def new @contact_event = ContactEvent.new @contact_event.type = params[:event_type] # can be letter, call, postcard, email @contact_event.event_id = params[:event_id] # that ID to the corresponding Model @contact_event.contact_id = params[:contact] @EventClass = case when @contact_event.type == 'letter' then 'Letter' when @contact_event.type == 'call' then 'Call' when @contact_event.type == 'email' then 'Email' SNAG BELOW: @event = @EventClass.find(@contact_letter.letter_id) #how do I make @EventClass actually the Class?SNAG # substitution of variables into the body of the contact_event @event.body.gsub!("{FirstName}", @contact.first_name) @event.body.gsub!("{Company}", @contact.company_name) @evebt.body.gsub!("{Colleagues}", @colleagues.to_sentence) @contact_event.body = @event.body @contact_event.status = "sent" end

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• Help! Finding Community Linux Support

  <b>Linux.com:</b> "You've installed Linux, things are looking great, but you've run into a snag and need a little helping hand. You're in good hands. The community is here to help, if you know where to look."

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• How can I stop my Jitter physics meshes being offset?

  - by ben1066

  I'm developing a C# game engine and have hit a snag trying to add physics. I'm using XNA for graphics and Jitter for physics. I am trying to split the XNA model into it's meshes, then create a ConvexHull for each mesh. I then attempt to combine those into a CompoundObject, this however isn't working and depending upon the model the meshes are offset by different amounts. This is the code I'm currently using and it gives me: Any ideas?

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• open source free software program for screen shots

  - by Syed Tayyab Ali

  I am looking for open source sofware for screen shots. It would be nice if it is similar to snag it.

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• Batch convert AppleWorks files into PDF within originating folder, delete original file?

  - by Manca Weeks

  Probably AppleScript is the way to go with this - I have found scripts online that do this, but snag on oversize printable area and put files in the same folder - I need files to stay in the folder the source came from. If the script also deleted the original AppleWorks file, that would be even better, but not required. I have tried the last script from this post: https://discussions.apple.com/message/10127260#10127260#10127260 Any suggestions would be much appreciated.

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• Converting MSDN license to full, commercial license

  - by alex

  I had to throw a machine together in a bit of a hurry- to replace a machine that suddenly failed (no one had bothered to keep a "warm" backup) It has Windows Server 2008 and SQL 2008 The snag is, I installed them off our MSDN subscription media, due to me not having "licensed" software. I need to put this machine into production. We are in the process of buying the licenses from a MS reseller now. Is there a way to "convert" the MSDN license to production on both Windows Server and SQL?

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• Debugging .NET 2.0 Assembly from unmanaged Code in VS2010?

  Ive run into a serious snag trying to debug a .NET 2.0 assembly that is called from unmanaged code in Visual Studio 2010. I maintain a host of components that using COM interop and custom .NET runtime hosting and ever since installing Visual Studio 2010 Ive been utterly blocked by VS 2010s inability to apparently debug .NET 2.0 assemblies when launching through unmanaged code. Heres what Im actually doing (simplified scenario to demonstrate): I have a .NET 2.0 assembly that is compiled for...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• 2D tile-based terrain generation

  - by a240

  As a summer project I decided it would be fun to make a Flash game. Right now I'm going for something like the look of Terraria. It's been a lot of fun, but today I've hit a snag. I need a way to generate my worlds. I've read up Perlin noise as a possibility, but I my attempts have given me sporadic looking results. What are some techniques used to generate these 2D tile-based worlds? Ideally I would like to be able to generate mountains, plains, and caves.

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• Sharing Authentication Across Subdomains using cookies

  - by Jordan Reiter

  I know that in general cookies themselves are not considered robust enough to store authentication information. What I am wondering is if there is an existing design pattern or framework for sharing authentication across subdomains without having to use something more complex like OpenID. Ideally, the process would be that the user visits abc.example.org, logs in, and continues on to xyz.example.org where they are automatically recognized (ideally, the reverse should also be possible -- a login via xyz means automatic login at abc). The snag is that abc.example.org and xyz.example.org are both on different servers and different web application frameworks, although they can both use a shared database. The web application platforms include PHP, ColdFusion, and Python (Django), although I'm also interested in this from a more general perspective (i.e. language agnostic).

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• Migrate 12.04 Wubi install to new partition with corrupted win7 install and small hard drive

  - by Robin Clark

  The move from Win7 to Ubuntu 12.04 has been honestly awesome. But I've come into a snag because my Win7 inevitably broke. I can still boot into Ubuntu even though Win7 is broken (won't boot, can't repair). I'd like to Migrate Wubi to a real partition and forget about windows. Presumably under normal conditions I would run the Ubuntu live CD, create a new partition then log back into my Wubi install and migrate using the script to the new partition. But I'm worried if I do that I'll break my current wubi set-up and be unable to migrate. I have a small hard drive, only 75GB and unfortunately my backup drive recently died so can't migrate there first and transfer over either. Does anybody have any suggestions to solve this?

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• 2D Tile-based terrian generation

  - by a240

  As a summer project I decided it would be fun to make a flash game. Right now I'm going for something like the look of http://www.terraria.org/. It's been a lot of fun, but today I've hit a snag. I need a way to generate my worlds. I've read up Perlin Noise ( http://freespace.virgin.net/hugo.elias/models/m_perlin.htm ) as a possibility, but I my attempts have given me sporadic looking results. What are some techniques used to generate these 2D tile-based worlds? Ideally I would like to be able to generate mountains, plains, and caves.

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• Cannot mount USB disks due to "not authorized" error

  - by shadovv

  I have Ubuntu 12.04 (.2?) installed. I don't plan to need GUI after setup so I modified the grub to start in console. However, whenever I want to start up GUI I need to type startx. Simple/basic stuff. However I seem to be hitting a snag: I am having trouble mounting/accessing USB flash drives in the GUI I started in the console. "Unable to mount location - not authorized". Seemed like it should be an easy fix, but can't figure out how I'm overlooking it. Can someone help me out?

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• Syncing properties across a game server

  - by Vaughan Hilts

  I'm beginning to implement a simple scripting system into my networked server, and I've hit a snag. Before, I've been wrapping my calls into functions on objects that manipulate objects, but lately I've been finding this to be a pain for simple things. For example, if I set 'player.HP = 1'.. this works server-side. But the player side never sees this change unless I explicitly send a packet to inform the client. For many things like map swapping that require more complicated changes, like change X, Y, Map and do this.. I have a function. That's fine. But what about these small properties I want to sync?

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• HOWTO use UIWebView to display a downloaded file later?

  - by Roboprog

  How do I format an NSURL (what path, or path generator function) so that I can display a downloaded local file (NOT part of the application NSBundle) for use offline? The idea is to snag an HTML file, clean it up and stash it in the iFoo application specific storage area, then later use UIWebView to display it. Next, I go off to RTFM about working with files on iFoo (iPhone / iPad) in general, but any fast-start tips are appreciated.

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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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• Using a redirect of any form to remove a query string with Apache

  - by Bart B

  Because of the silly way iTunes works the only way to update the URL for a feed is by setting up a permanent redirect from the old feed to the new. This seems easy, but I've hit a snag. The old URL ended in /?feed=rss2, the new URL is just a file, so it ends in podcast.xml. When I redirected from the old URL to the new, iTunes picked up the new URL BUT, WITH the query string, so now the URL ends in podcast.xml?feed=rss2. This is allowing listers to download the show - which is good, but causing some other problems. Is there any possible way to set up a permanent redirect that will redired podcast.xml?feed=rss2 to just podcast.xml? Mod_Rewrite seems to just pass through query strings, so I'm at a loss! Bart.

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• How can I sync Nokia smartphones' calendars with Snow Leopard Server's iCal Server?

  - by Joe Carroll

  I've just installed and configured a Mac Mini Server for a customer who wanted to stop using Google Apps for their email. The plan was to also use the new server's calendaring service but we've hit a small snag: the staff all use iCal on Macs and Nokia E71s and there doesn't seem to be a way to use a single calendar for each person that syncs with both. iSync/iCal doesn't appear to allow their manually-synced phones to sync with the CalDAV calendars on the server, only with local calendars on their Macs. Nor does Nokia's organiser software support CalDAV but rather SyncML for live networked syncing. I was wondering if there's a plugin for iCal Server that would provide a bridge to a SyncML service I could run on the server... or anything else that would work (preferably FOSS)!

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• Mixing RAM brands

  - by Andy

  Hey guys, I'm scheduled to install a server at a colo facility tomorrow, but I've hit a snag. ESXi doesn't like the fact that I have 12GB ram in my server (8gb on one side of CPU, 4gb on the other). I currently have 3xCrucial 4gb ECC DDR3 1333mhz sticks (http://www.amazon.com/gp/product/B001TGT7EE/ref=oss_product) and I'm planning on stopping by Fry's on the way to the colo facility so I can pick up another stick so that ESXi will install. Problem is, Fry's doesn't stock Crucial RAM. They do have a stick that I think is identical to my crucial one: http://www.frys.com/product/5915524?site=sr:SEARCH:MAIN_RSLT_PG Will this be dangerous to use in my server? The specs on the RAM are the same as far as I know (ecc registered, 1333mhz, ddr3, 4gb).

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• SPF include: too many IP addresses

  - by sprezzatura

  I've hit a snag with SPF. The SPF record for my domain will contain four or five entries, plus it will contain: include:sgizmo.com The SPF record for sgizmo.com contains eleven entries! This, plus mine, is way over the maximum ten allowed by the RFC (and probably by most servers). I realize that there has to be a limit in order to prevent DoS attacks. However, in the real world, it is probably not unreasonable for large companies to have many server addresses. Furthermore, must I know monitor my 'include:' counterparts for changes and additions? Must I check weekly, daily, to insure that some combination of changes doesn't suddenly put me over the top? It doesn't seem to me that SPF is suitable for prime time. Is there another way to do this?

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• Write permission when mounting Windows shares from Ubuntu

  - by Ola Tuvesson

  I think I'm close to having my dev environment set up exactly the way I want, but one final snag remains. I'm running VirtualBox on a Windows 7 64bit host, with my dev enviroment inside a Ubuntu 12.04 guest. I want to keep the files for my projects on the host filesystem - partly so I can access them when the Ubuntu guest is not running, but also so I can use Tortoise and other Windows based tools (cough Photoshop), and it also eases my backup scheme somewhat. So I've got a folder "Rails" on my NTFS drive, which I've shared from the host with a user specifically created for the Ubuntu guest. The mount point has been set up and an entry added to fstab (cifs), using a credentials file and the options iocharset=utf8,file_mode=0777,dir_mode=07??77 This mounts fine and my Ubuntu user has both read and write permissions to the contents, but when I try to start my Rails app I get permission errors on any files the app needs to write to (e.g. the log file). What gives?

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• Blocking ports on the public IP assigned to lo interface in GNU/Linux

  - by nixnotwin

  I have setup my Ubuntu server as a router and webserver by following the answer given here. My ISP facing interface eth0 has a private 172.16.x.x/30 ip and my lo interface has a public IP as mentioned in the answer to the question linked above. The setup is working well. The only snag I have experienced is that I could not find a way to block the ports exposed by the public IP on the lo interface. I tried doing iptables -A INPUT -i eth0 -j DROP, and my server lost connectivity to the public network (internet). I could not ping any public ips. What I want is a way to block ports that are exposed by the public ip on the lo interface. And also I require iptables rules that can expose ports like 80 or openvpn port to the public network.

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• Executing EXE with wildcard from psexec

  - by Danny

  I'm writing a few scripts that I am using to integrate with bamboo for some continuous integration improvements and I've run into a bit of a snag. I'm currently trying to run a psexec command that installs the latest build on the remote machine but I dont necessary know the revision number. For example, the remote exe file could be Installer-3.1.xxxxx.exe where the xxxxx changes. I tried running the command with Installer-3.1.*.exe but it takes it as literal in Windows. I'm not overly familiar with Windows command prompt and am more used to Linux at this moment.

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• Help implementing virtual d-pad

  - by Moshe

  Short Version: I am trying to move a player around on a tilemap, keeping it centered on its tile, while smoothly controlling it with SneakyInput virtual Joystick. My movement is jumpy and hard to control. What's a good way to implement this? Long Version: I'm trying to get a tilemap based RPG "layer" working on top of cocos2d-iphone. I'm using SneakyInput as the input right now, but I've run into a bit of a snag. Initially, I followed Steffen Itterheim's book and Ray Wenderlich's tutorial, and I got jumpy movement working. My player now moves from tile to tile, without any animation whatsoever. So, I took it a step further. I changed my player.position to a CCMoveTo action. Combined with CCfollow, my player moves pretty smoothly. Here's the problem, though: Between each CCMoveTo, the movement stops, so there's a bit of a jumpiness introduced between movements. To deal with that, I changed my CCmoveTo into a CCMoveBy, and instead of running it once, I decided to have it CCRepeatForever. My plan was to stop the repeating action whenever the player changed directions or released the d-pad. However, when the movement stops, the player is not necessarily centered along the tiles, as it should be. To correctly position the player, I use a CCMoveTo and get the closest position that would put the player back into the proper position. This reintroduces an earlier problem of jumpiness between actions. What is the correct way to implement a smooth joystick while smoothly animating the player and keeping it on the "grid" of tiles? Edit: It turns out that this was caused by a "Bug Fix" in the cocos2d engine.

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