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  • Performance SAS vs SSD

    - by omoto
    When it comes to speed of development, very important thing is your hardware. I need suggestion to choice between hard drives. What is a best solution: price/value

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  • Which ports to open on domain vs internet

    - by zsharp
    I have a web server/database/domainController. I notice that ports 137 and 138 on the public IP AND private IP are open on all machines there are also other open ports on 0.0.0.0.(ie. 135, 2002) Can and should I close 137-139 on the public IP only? will that interfere with any services.

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  • Pointers to Derived Class Objects Losing vfptr

    - by duckworthd
    To begin, I am trying to write a run-of-the-mill, simple Ray Tracer. In my Ray Tracer, I have multiple types of geometries in the world, all derived from a base class called "SceneObject". I've included the header for it here. /** Interface for all objects that will appear in a scene */ class SceneObject { public: mat4 M, M_inv; Color c; SceneObject(); ~SceneObject(); /** The transformation matrix to be applied to all points of this object. Identity leaves the object in world frame. */ void setMatrix(mat4 M); void setMatrix(MatrixStack mStack); void getMatrix(mat4& M); /** The color of the object */ void setColor(Color c); void getColor(Color& c); /** Alter one portion of the color, leaving the rest as they were. */ void setDiffuse(vec3 rgb); void setSpecular(vec3 rgb); void setEmission(vec3 rgb); void setAmbient(vec3 rgb); void setShininess(double s); /** Fills 'inter' with information regarding an intersection between this object and 'ray'. Ray should be in world frame. */ virtual void intersect(Intersection& inter, Ray ray) = 0; /** Returns a copy of this SceneObject */ virtual SceneObject* clone() = 0; /** Print information regarding this SceneObject for debugging */ virtual void print() = 0; }; As you can see, I've included a couple virtual functions to be implemented elsewhere. In this case, I have only two derived class -- Sphere and Triangle, both of which implement the missing member functions. Finally, I have a Parser class, which is full of static methods that do the actual "Ray Tracing" part. Here's a couple snippets for relevant portions void Parser::trace(Camera cam, Scene scene, string outputFile, int maxDepth) { int width = cam.getNumXPixels(); int height = cam.getNumYPixels(); vector<vector<vec3>> colors; colors.clear(); for (int i = 0; i< width; i++) { vector<vec3> ys; for (int j = 0; j<height; j++) { Intersection intrsct; Ray ray; cam.getRay(ray, i, j); vec3 color; printf("Obtaining color for Ray[%d,%d]\n", i,j); getColor(color, scene, ray, maxDepth); ys.push_back(color); } colors.push_back(ys); } printImage(colors, width, height, outputFile); } void Parser::getColor(vec3& color, Scene scene, Ray ray, int numBounces) { Intersection inter; scene.intersect(inter,ray); if(inter.isIntersecting()){ Color c; inter.getColor(c); c.getAmbient(color); } else { color = vec3(0,0,0); } } Right now, I've forgone the true Ray Tracing part and instead simply return the color of the first object hit, if any. As you have no doubt noticed, the only way the computer knows that a ray has intersected an object is through Scene.intersect(), which I also include. void Scene::intersect(Intersection& i, Ray r) { Intersection result; result.setDistance(numeric_limits<double>::infinity()); result.setIsIntersecting(false); double oldDist; result.getDistance(oldDist); /* Cycle through all objects, making result the closest one */ for(int ind=0; ind<objects.size(); ind++){ SceneObject* thisObj = objects[ind]; Intersection betterIntersect; thisObj->intersect(betterIntersect, r); double newDist; betterIntersect.getDistance(newDist); if (newDist < oldDist){ result = betterIntersect; oldDist = newDist; } } i = result; } Alright, now for the problem. I begin by creating a scene and filling it with objects outside of the Parser::trace() method. Now for some odd reason, I cast Ray for i=j=0 and everything works wonderfully. However, by the time the second ray is cast all of the objects stored in my Scene no longer recognize their vfptr's! I stepped through the code with a debugger and found that the information to all the vfptr's are lost somewhere between the end of getColor() and the continuation of the loop. However, if I change the arguments of getColor() to use a Scene& instead of a Scene, then no loss occurs. What crazy voodoo is this?

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  • CentOS Vs Windows Server 2008

    - by Steve
    Hi, Apologies if the question appears ambiguous, I have little experience in this area and was after some informed opinions. I am deploying a test scenario of a server/client network and need to make some choices for Server. The client will be a Windows system as it meets the requirements for the client, the server choice has more room for selection. From my experience with Linux in general and the appealing nature of open source for low cost, security etc and the availability and performance of database and web server programs I have been considering CentOS as a server choice. I have the ability to make most of the choices of what software / server packages I wish to install. This includes Active Directory (something I have no experience with). How well does this operate with Windows clients? Am I being too selective and creating unnecessary complication by setting out not to use a Windows Server OS?

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  • OpenVZ vs KVM for Linux VMs

    - by Eliasdx
    Hardware: Intel® Core™ i7-920, 12 GB DDR3 RAM, 2 x 1500 GB SATA-II HDD (no SoftRaid because Proxmox developers don't support softraid and they are sure you'll run into problems) Software: Proxmox VE with KVM and OpenVZ support and debian everywhere I want to run multiple Linux VMs on this server. One for a firewall (I want to try pfSense), one for MySQL, one VM for nginx (my stuff) and ~2 VMs with nginx for other people's web sites. I don't think that pfSense will run in an OpenVZ environment but it should run in KVM. The question is if I should setup the other VMs using KVM or OpenVZ. In OpenVZ they should have less overhead for the OS itself but I don't know about the performance. I heard that KVM is more stable but needs more RAM and CPU. I found this diagram showing a OpenVZ setup on the same hardware I'm using. This guy uses an own VM for each and every website which is running on his server. I can't think of any advantage why he's using so many VMs.

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  • What should I call a class that contains a sequence of states

    - by Robert P
    I have a GUI tool that manages state sequences. One component is a class that contains a set of states, your typical DFA state machine. For now, I'll call this a StateSet. However, I have another class that has a collection (possibly partially unordered) of those state sets, and lists them in a particular order. and I'm trying to come up with a good name for it - not just for internal code, but for customers to refer to it. I've got: Sequence (maybe) StateSetSet (reasonable for code, but not for customers) Any other suggestions or ideas?

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  • Renting an "EC2" server VS buying one (for a start up in initial stages)

    - by krish p
    We are a small start up in the early stages and are working on a SaaS-based Rails product. Currently, we use EC2 for a small instance and have a need for another large/extra-large instance as we are beginning to deploy to the Cloud and get ready to release our "alpha" version. While EC2 was my choice for numerous reasons (reliability, accessibility - small team is geographically dispersed, maintainability, and things of that nature), it appears to be rather expensive. While the product will ultimately be deployed in the Cloud (be it EC2 or otherwise) and that experience would help the development team, would it make sense to purchase a physical server and stick it in the basement or bite the bullet and pay the price for EC2 (or other Cloud Providers)? While such decisions are driven by numerous factors, it would certainly help to get the thoughts of other folks who may have been in similar situations. Hence, the post. Thanks much!

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  • Modularity Java: top level vs. nested classes

    - by an00b
    The Java tutorials that I read, like to use nested classes to demonstrate a concept, a feature or use. This led me to initially implement a sample project I created just like that: Lots of nested classes in the main activity class. It works, but now I got a monstrous monolithic .java file. I find it somewhat inconvenient and I now intend to break to multiple .java files/classes. It occurred to me, however, that sometimes there may be reasons not to take classes out of their enclosing class. If so, what are good reasons to keep a module large, considering modularity and ease of maintenance?

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  • UITabBarContrtoller achieve from a different class in iPhone

    - by baluedo
    Hi! I have the following problem: There is a class that includes five tabs in the following way: mainMenuClient.h #import <UIKit/UIKit.h> @interface MainMenuClient : UIViewController { UITabBarController *tabBarController; } @property (nonatomic, retain) UITabBarController *tabBarController; @end mainMenuClient.m -(void)viewDidLoad { UIView *contentView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]]; contentView.backgroundColor = [UIColor blackColor]; self.view = contentView; [contentView release]; ContactListTab *contactTab = [[ContactListTab alloc] init]; ChatTab *chat = [[ChatTab alloc]init]; DialerTab *dialer = [[DialerTab alloc]init]; MenuTab *menu = [[MenuTab alloc]init]; TesztingFile *teszting = [[TesztingFile alloc]init]; contactTab.title = @"Contact List"; chat.title = @"Chat"; dialer.title = @"Dialer"; menu.title = @"Menu"; teszting.title = @"TesztTab"; contactTab.tabBarItem.image = [UIImage imageNamed:@"Contacts_icon.png"]; chat.tabBarItem.image = [UIImage imageNamed:@"Chat_icon.png"]; dialer.tabBarItem.image = [UIImage imageNamed:@"Dialer_icon.png"]; menu.tabBarItem.image = [UIImage imageNamed:@"Menu_icon.png"]; teszting.tabBarItem.image = [UIImage imageNamed:@"Contacts_icon.png"]; chat.tabBarItem.badgeValue = @"99"; tabBarController = [[UITabBarController alloc]init]; tabBarController.view.frame = CGRectMake(0, 0, 320, 460); [tabBarController setViewControllers:[NSArray arrayWithObjects:contactTab, chat, dialer, menu, teszting, nil]]; [contactTab release]; [chat release]; [dialer release]; [menu release]; [teszting release]; [self.view addSubview:tabBarController.view]; [super viewDidLoad]; } In the contactTab class there are a UITableViewController. contactTab.h - (void)updateCellData; - (void)configureCell:(UITableViewCell *)cell forIndexPath:(NSIndexPath *)indexPath; There is a third class, which I would like to achieve is a method of UITableViewController's (from ContactTab). So far I tried this: When I tried to achieve the UItabbarController: MainMenuClient *menu; UITabBarController *tabBarControllerchange = [[UITabBarController alloc] init]; tabBarControllerchange = menu.tabBarController; [tabBarControllerchange setSelectedIndex:0]; When I tried to achieve the UITableViewController: ContactListTab *contactListTab; [contactListTab updateCellData]; Does anybody have an idea for this problem? Thanks. Balazs.

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  • TCP Server Memory management: #Connections Vs. #Requests

    - by Andrew
    Given that, there is no theoretical limit to number of concurrent TCP connections a Windows 2008 server can handle. Only thing will happen is, with each connection there will be memory consumption in server. Unfortunately, memory is not unlimited (and I want to utilize only physical memory). For example, lets say we've 2GB server memory. Now there are two extreme cases: Case 1: If we've allocated 64KB buffer for each connection (only to receive incoming request), then 32768 connections can consume all the 2GB of memory. This will not leave any memory to queue/process incoming requests from those connections. Case 2: On the other hand, lets say a single (or very few) connections continuously keeps sending request buffers (for example, video streaming from one connection to other) and server cannot process them within time, those buffers will get piled up in server and eventually will occupy most of the servers memory. And it will not leave any memory for new connection thereafter. This is the real dilemma in server design bugging me badly for last many days. If I can decide on max size of request buffer per connection and max number of requests to allow in queue per connection. Then, based on available server memory, it will then automatically set limit on max number of concurrent connections. How to decide on these limits to achieve best performance and throughput? I am just looking for perfect utilization of server resources. Are there any standard guidelines or empirical data available with someone who can share with me please.

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  • Puppet yum repo - Pull down 2.7.x vs 3.0.x

    - by Mike Purcell
    So a few weeks ago I started on the path to using puppet to automate all the configs/services. At the time I was using the EPEL repo, which installed version 2.6.x. After some reading I was trying to gain access to the flatten method available via the puppet stdlib, and thought it was available by default in the newer 2.7.x version. So I added a puppet repo with the following settings: [puppetlabs] name=Puppet Labs Packages baseurl=http://yum.puppetlabs.com/el/$releasever/products/$basearch/ enabled=1 gpgcheck=1 gpgkey=http://yum.puppetlabs.com/RPM-GPG-KEY-puppetlabs The problem with this, is it installed v3.0.x instead of 2.7.x. And apparently 3.0.x is a major upgrade which was released only a few weeks ago. Obviously I would prefer to use the 2.7.x for the next few months while PuppetLabs fix any defects which will inevitably arise after a major version. So my question is, what setting can I add to the puppet repo config to pull down only the 2.7.x branch and not the 3.0.x branch?

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  • Jquery find next/prev elements of a certain class but not necessarily siblings

    - by Gnuffo1
    The next, prev, nextAll and prevAll methods are very useful, but not if the elements you are trying to find are not in the same parent element. What I want to do is something like this: <div><span id="click">hello</span></div> <div><p class="find">world></p></div> When the span with the id "click" is pressed, I want to match the next element with the class "find", which in this case is not a sibling of the clicked element so next or nextAll won't work.

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  • Bacula vs. BackupPC

    - by chronoz
    I have been googling about the differences between them. Bacula has lots of roles BackupPC is easier to configure Bacula works with agent, not rsync (great for Windows backups) It seems that Bacula is most often compared to Amanda though, while BackupPC seems a perfectly lovely and popular backup distribution to. I currently backup my servers with rsnapshot, but I am looking for a professional scalable solution that could also back-up 50 hosts without problems. Preferably a solution that can offer bare metal restores for my Linux servers. I am not looking to reinstall the exact same version of Plesk, the software, etc...

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  • Software/FakeRAID: Windows 8 Disk Mirroring vs Intel Onboard

    - by Johnny W
    So Windows 8 is out and I have a new motherboard. I wish to create a RAID 1 coupling between two HDDs -- for storage purposes only (my OS is on an SSD) -- but I don't know which is the best route to take. My motherboard (Z77 chipset) comes with the age old Intel Fake RAID, but since I only wish to use my RAID for storage, I wondered if I might be better to use Windows 8 Disk Mirroring. Can anyone advise which is better? Or perhaps the pros and cons of each, if that's too contentious? I just can't see the benefit of FakeRAID. You can see my current setup here, if that might change things(?): Thanks!

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  • Boost signals and passing class method

    - by Ockonal
    Hello, I've defined some signal: typedef boost::signals2::signal<void (int temp)> SomeSig; typedef SomeSig::slot_type SomeSigType; I have some class: class SomeClass { SomeClass() { SomeSig.connect(&SomeClass::doMethod); } void doMethod(const SomeSig &slot); }; And got a lot of errors: error: ‘BOOST_PP_ENUM_SHIFTED_PARAMS_M’ was not declared in this scope error: ‘T’ was not declared in this scope error: a function call cannot appear in a constant-expression error: a function call cannot appear in a constant-expression error: template argument 1 is invalid error: ‘BOOST_SIGNALS2_MISC_STATEMENT’ has not been declared error: expected identifier before ‘~’ token error: expected ‘)’ before ‘~’ token error: expected ‘;’ before ‘~’ token

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  • Two Firefox windows vs two browsers? Ram Consumption

    - by Kayle
    I don't know enough about Ram & sharing to know what the difference is here. Normally, I run Chrome in one desktop for personal use, and Firefox on a second desktop for business. I like the separation of saved passwords and whatnot. However, I recently learned that I can open two different profiles in Firefox at the same time, so I was wondering if that would be cheaper to my system resources, or not? Out the door, I don't think it would save more than 40-60mb of ram... but I'm wondering, 3 hours later, if ram handling will be better using just one browser for all my heavy lifting. I only have 2gb of ram and I run iTunes and Photoshop as well, almost all day. So I like to save ram where I can. Any thoughts? UPDATE: I've been centering around chrome more recently and using firefox for testing. Dev isn't bad on Chrome and it's great at releasing memory when I close tabs. In retrospect, I think the best answer to this question is simply for me to buy another 2gb of ram.

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  • HP Laserjet "maintenance interval" vs "fuser life"

    - by marienbad
    I posted a question about the Laserjet 8100DN earlier here: http://serverfault.com/questions/139043/buying-an-old-laser-printer-what-will-need-to-be-replaced and from doing some more research I have a new question: I found the "maintence interval" -- "the interval at which you should install a maintenance kit" (which is a fuser and rollers), and it is...350,000 pages. BUT, when I look at the specs for an HP 8100 fuser, it says the fuser has a life span of 150,000 pages. What gives? – Will the fuser go bad after 150 or 350? ==== BTW I hope it's ok to ask another similar question in a new thread -- I'm just following instructions from my thread on the topic at Meta.

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  • Mac OS X Server mobile account VS Time Machine Network Backup

    - by elhombre
    I am installing a Server @home to manage the mac client's of my family. First I wanted to make time machine Backups over the internal network to an external Hard-drive which is connected to my Mac OS X Server (10.6) but when I read about the mobile accounts and it's synchronization features I got a little bit irritated what the differences between the two Services are. So where are the differences between a mobile account and a Time Machine Backup which is made over the network? Can the synchronized mobile Account be backup to an external Harddisk, if yes, how?

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  • Self-healing Cloud vs Failover Boxes

    - by IMB
    Now that self-healing cloud servers are becoming more and more popular, I am currently torn between the decision if I should setup a HAproxy failover for my VPS or if should save myself the trouble and just put my sites on a self-healing cloud server. Does it still make sense to setup your own failover system (HAproxy + 2 or more servers for example) when self healing cloud seems like a practical solution? They seem to do the same job or am I missing something?

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  • CSS: move a "float:right" element to top (to align with the first element of the list)

    - by Patrick
    hi, I've a sequence of elements and the last one has css "float:left". I would like to display it at the same height of the first element and not on the bottom of the list. (I cannot change the html code, so it is the last in the list). At the same time, I would like to keep it on the right. How can I make it wich CSS ? thanks Code: <div class="field field-type-text field-field-year"> <div class="field-items"> <div class="field-item odd"> <div class="field-label-inline-first"> Year:&nbsp;</div> 2009 </div> </div> </div> <div class="field field-type-text field-field-where"> <div class="field-items"> <div class="field-item odd"> <div class="field-label-inline-first"> Where:&nbsp;</div> Musée Rath, Geneva </div> </div> </div> <div class="field field-type-text field-field-when"> <div class="field-items"> <div class="field-item odd"> <div class="field-label-inline-first"> When:&nbsp;</div> 25.8 – 27.9.2009 </div> </div> </div> <div class="field field-type-text field-field-editor"> <div class="field-items"> <div class="field-item odd"> <div class="field-label-inline-first"> Editor:&nbsp;</div> Blabla Blabla </div> </div> </div> <div class="field field-type-text field-field-material"> <div class="field-items"> <div class="field-item odd"> <div class="field-label-inline-first"> Material/techniques:&nbsp;</div> contemporary art installations </div> </div> </div> <div class="field field-type-text field-field-dimension"> <div class="field-items"> <div class="field-item odd"> <div class="field-label-inline-first"> Dimension:&nbsp;</div> 2 floors in a neoclassical building </div> </div> </div> <div class="field field-type-text field-field-artists"> <div class="field-items"> <div class="field-item odd"> <div class="field-label-inline-first"> Artists:&nbsp;</div> Blablablabla balbalbalbalba </div> </div> </div> .field-field-year, .field-field-where, .field-field-when, .field-field-editor, .field-field-material, .field-field-dimension { width:300px; } .field-field-artists { width:400px; float:right; clear:right; top-margin: -200px; }

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