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• iSCSI: LUNs per target?

  - by badnews

  My question relates specifically to ZFS/COMSTAR but I assume is generally applicable to any iSCSI system: Should one prefer to create a target for every LUN that you want to expose? Or is it good practise to have a single target with multiple LUNs? Does either approach have a performance impact? And is there some crossover point where the other approach makes sense? The use case is for VM disks, where each disk (zvol) is a LUN. So far we have created a a separate target for each VM; but a single target that contains all the LUNs would probably greatly simplify management... but we may need hundreds of LUNs per a single target. (And then possibly tens of initiator connections to that target)

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• MySQL Makes The Cover of Oracle Magazine!

  - by bertrand.matthelie(at)oracle.com

  @font-face { font-family: "Arial"; }@font-face { font-family: "Times"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }a:link, span.MsoHyperlink { color: blue; text-decoration: underline; }a:visited, span.MsoHyperlinkFollowed { color: purple; text-decoration: underline; }div.Section1 { page: Section1; } In case you haven't seen it yet, MySQL made the cover of the January/February Edition of Oracle Magazine!   Published 6 times per year and distributed to over half a million of IT managers, DBAs and developers, Oracle Magazine contains technology-strategy articles, sample code, tips, Oracle & partner news, and more.   @font-face { font-family: "Arial"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }div.Section1 { page: Section1; } If you're thinking that this is yet another indicator that Oracle is very serious about MySQL, you're absolutely right!   I encourage you to read David Kelly's "Open For Business" article posted online here.   "First released in 1995 and purchased by Sun in 2008, MySQL has quickly graduated from the realm of hobbyists to the world of business, becoming the leading open source database for many Web applications and an integral part of the LAMP (Linux, Apache, MySQL, PHP) Web application stack. Almost a year after Oracle's acquisition of Sun, MySQL plays an even bigger role in enterprises of all sizes worldwide." ......   Enjoy the article!

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• 1.5 TB USB Drive failed to mount

  - by user89348

  Seagate 1.5Tb FreeAgent USB Hard Drive. Formatted FAT32. I figure it is 75% full. Used to work fine in XUBUNTU it shows up in Cairo Dock but when I click on it I get "failed to mount drive'. Nautilus does not display the icon nor does Thunar. Windows Vista will no longer recognise drive either. Back Track 5R3 also no longer fails to mount it. BUT and here is the BIG BUT my Pioneer DV-410 reads the files and plays the everything just fine. I believe this all happened after an unclean shutdown / XUbuntu 12.10 system freeze. Why can't XUBUNTU mount this drive when a crappy 13 year old DVD player can mount it. I am desperate to back up the data before just in case the drive becomes completely unreadable. Using XUBUNTU 12.10 Quantal current 3.5.0.17 Kernel (past 3 Kernels wont read it either) and all newest apt-get update / dist-upgrade are applied. I will post any other info you folks request as needed. Additional info as requested by githlar. $ sudo fsck.vfat /dev/sdb dosfsck 3.0.13, 30 Jun 2012, FAT32, LFN Read 512 bytes at 0:Input/output error $ lsusb Bus 001 Device 003: ID 148f:3070 Ralink Technology, Corp. RT2870/RT3070 Wireless Adapter Bus 002 Device 002: ID 0bc2:3001 Seagate RSS LLC Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

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• Using template questions in a technical interview

  - by Desolate Planet

  I've recently been in an argument with a colleage about technical questions in interviews. As a graduate, I went round lots of companies and noticed they used the same questions. An example is "Can you write a function that determines if a number is prime or not?", 4 years later, I find that particular question is quite common even for a junior developer. I might not be looking at this the correct way, but shouldn't software houses be intelligent enought to think up their own interview questions. This may well be the case, but I've been to about 16 interviews as a graduate and the same questions came up in about 75% of them. This leads me to believe that many companies are lazy and simply Google: 'Template questions for interviewing software developers' and I kind of look down on that. Question: Is it better to use a sest of questions off some template or should software houses strive to be more original and come up with their own interview material? From my point of view, if I failed an inteview and went off and looked for good answers to the questions I messed up on, I could fly through the next interview if they questions are the same.

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• Script language native extensions - avoiding name collisions and cluttering others' namespace

  - by H2CO3

  I have developed a small scripting language and I've just started writing the very first native library bindings. This is practically the first time I'm writing a native extension to a script language, so I've run into a conceptual issue. I'd like to write glue code for popular libraries so that they can be used from this language, and because of the design of the engine I've written, this is achieved using an array of C structs describing the function name visible by the virtual machine, along with a function pointer. Thus, a native binding is really just a global array variable, and now I must obviously give it a (preferably good) name. In C, it's idiomatic to put one's own functions in a "namespace" by prepending a custom prefix to function names, as in myscript_parse_source() or myscript_run_bytecode(). The custom name shall ideally describe the name of the library which it is part of. Here arises the confusion. Let's say I'm writing a binding for libcURL. In this case, it seems reasonable to call my extension library curl_myscript_binding, like this: MYSCRIPT_API const MyScriptExtFunc curl_myscript_lib[10]; But now this collides with the curl namespace. (I have even thought about calling it curlmyscript_lib but unfortunately, libcURL does not exclusively use the curl_ prefix -- the public APIs contain macros like CURLCODE_* and CURLOPT_*, so I assume this would clutter the namespace as well.) Another option would be to declare it as myscript_curl_lib, but that's good only as long as I'm the only one who writes bindings (since I know what I am doing with my namespace). As soon as other contributors start to add their own native bindings, they now clutter the myscript namespace. (I've done some research, and it seems that for example the Perl cURL binding follows this pattern. Not sure what I should think about that...) So how do you suggest I name my variables? Are there any general guidelines that should be followed?

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• How do I install Ubuntu 13.10 from a partition on my Mac?

  - by Barry

  I am trying to install Ubuntu 13.10 on my Macbook Air. I've previously had no issue installing from a USB stick to this machine. However, I don't currently have access to a USB stick or any external media at all! What I've done so far is partitioned my SSD into 3 partitions. One holds OS X, another is a 5gb partition intended for the install ISO, and a third is intended to be the target for that install. The second two partitions are formatted as FAT. I've used dd (with and without bs=1m) to "burn" my ISO to the small 5gb FAT partition. I also at one point tried using hdituil to convert my ISO file to IMG and went through the same process with same result below. After "burning" my ISO to the small partition, I reboot into Refind. Refind sees my small 5gb partition perfectly well, and when I select that partition it loads GRUB appropriately. However, from here, regardless of what I choose, Ubuntu will start to load and then after a few minutes crash out to: BuzyBox V1.15.3 (Ubuntu 1:1.15.3-1ubuntu5) built-in shell (ash) Enter 'help' for a list of built in commands. (initramfs) unable to find a medium containing a live file system. I've Googled this error and found a number of people encountering it when trying to install from USB, but no solutions seem applicable to my case (installing from a partition on my SSD, to another partition on my SSD). Is there any solution to this, or do I just need to wait a few days until I have access to a USB stick? Many thanks in advance, and apologies for length -- I figured I'd err on the side of being exhaustive rather than having people suggest things I've already tried.

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• Unidirectional synchronization and admin back-end

  - by HTF

  I have Wordpress installation on two web nodes (load balancing/failover). There is unidirectional synchronization from server A to server B so any updates must occur on the first web node. I have a problem with Wordpress admin side. I'm using Nginx and the initial plan was to create rewrite rule from domain.com/wp-admin to wpadmin.domain.com - pointing to the first node. The problem is that the Wordpress installation can be access only via main domain and without extra subdomain there is no distinction between both web servers for the rewrite rule. Could you please advise if there is any other solution in this case. Regards

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• Using position function for accessing particular node when using While Activity in SOA 11.1.1.5

  - by AJ

  Hi If you are using while activity in SOA Suite 11.1.1.5 and within loop you have a requirement to access repeating node of XML. You might need to use below XPATH expression for accessing the node. Here is the XML that I am using for this example <?xml version='1.0' encoding='UTF-8'?> David DemoJob 1 2012-04-15 40000 0 10 Steve TestJob 1 2012-04-15 40000 0 10 Here you can notice that Emp node is repeating i.e. EmpCollection node will contain multiple employees. Now in loop one of assign activity you need to access a particular node for e.g. For first time loop runs you want to access first node and second time second node and so on. You need to make use of postion() function like bpws:getVariableData('Receive1_Read_InputVariable','body','/ns4:EmpCollection/ns4:Emp[position()=$loopCounter]/ns4:job') Please Note: Here loopCounter is a variable that we have created of type xsd:int and prior to loop we have initialized a value of 1. Loop will run depending on the number of Emp nodes present at runtime. For that in while Activity you can use below XPATH expression ora:countNodes('Receive1_Read_InputVariable','body','/ns4:EmpCollection/ns4:Emp')=bpws:getVariableData('loopCounter') Do let me know in case of any issues or concern. Cheers AJ

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• (PHP vs Python vs Perl) vs Ruby [closed]

  - by Dr.Kameleon

  OK, here's what : I've programmed in over 20 different languages and now, because of a large project I'm currently working on for Mac OS X (in Objective-C/Cocoa), I need to make a final decision on which language to use for my background scripting + plugin functionality. Definitely, one factor that'll ultimately influence my decision is which one I'm most familiar with, which is PHP (one of the ugliest languages around, which I however adore... lol), then Python / Perl (the "proven values"... )... and then Ruby (which, to me, is almost confusing and I've only played with it for some time.) Now, here's my considerations : (As previously mentioned) Being familiar with it (anyway, if X is better in my case, I really don't mind studying it from scratch...) Speed Good interaction with the Shell + ease of integration with my Cocoa application Btw, some of the reasons that made me wonder if Ruby would be a good choice is : The hype around it (although, I still don't get why; but that's probably just me...) My major competitor (we're actually talking about the same type of software here) is using Ruby for its backend scripting almost exclusively (ok, along with some BASH). Isn't Ruby considered slower e.g. than Perl? Why did he choose that? Simply, a matter of personal taste? So... your thoughts?

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• Game programming basics under Windows

  - by dreta

  I've been trying to learn some Windows programming using the Win32 API. Now, i'm used to working with the OS layer being abstracted away, mostly thanks to libraries like SFML or Allegro. Could you guys help me out and tell me if i'm thinking right here. The place for my gameloop is where i'm reading the messages? while (TRUE) { if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE)) { if (msg.message == WM_QUIT) break ; TranslateMessage (&msg) ; DispatchMessage (&msg) ; } else { //my game loop goes here } } Now the slightly bigger issue, that is, drawing. Do i run my drawing where i normaly do it, inside the game loop after the game logic? Or do i do it when WM_PAIN is being called and just call InvalidateRect (hwnd, NULL, TRUE); when i want to draw? This does feel weird, the WM_PAINT is a queued message, so i don't know for sure when it'll be called. So if i wanted to avoid this, do i just get the device handle inside the game loop and only ValidateRect (hwnd, NULL); in the WM_PAINT case (beside the ValidateRect (hwnd, NULL); called after drawing in the game loop)? Actually, now that i think about it, do i even need WM_PAINT in this situation or can i skip it and let DefWindowProc handle it (does it validate the screen if WM_PAINT isn't processed)? If this is any important, i'm setting up my code for OpenGL.

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• Design for object with optional and modifiable attributtes?

  - by Ikuzen

  I've been using the Builder pattern to create objects with a large number of attributes, where most of them are optional. But up until now, I've defined them as final, as recommended by Joshua Block and other authors, and haven't needed to change their values. I am wondering what should I do though if I need a class with a substantial number of optional but non-final (mutable) attributes? My Builder pattern code looks like this: public class Example { //All possible parameters (optional or not) private final int param1; private final int param2; //Builder class public static class Builder { private final int param1; //Required parameters private int param2 = 0; //Optional parameters - initialized to default //Builder constructor public Builder (int param1) { this.param1 = param1; } //Setter-like methods for optional parameters public Builder param2(int value) { param2 = value; return this; } //build() method public Example build() { return new Example(this); } } //Private constructor private Example(Builder builder) { param1 = builder.param1; param2 = builder.param2; } } Can I just remove the final keyword from the declaration to be able to access the attributes externally (through normal setters, for example)? Or is there a creational pattern that allows optional but non-final attributes that would be better suited in this case?

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• Ubuntu 13.10 AMD/ATI proprietary driver slow boot time, lengthy login/logout delays

  - by NahsiN

  Ubuntu 13.10 is causing me major headaches with my AMD/ATI HD 5770 GPU. Below is a list of problems I am currently encountering. 1) The boot time is extended by at least 25s after installing catalyst 13.4. Using open source radeon drivers, my boot time till the login screen is ~10s. With catalyst 13.4 installed, the boot time increases to ~35s. This was not the case in Ubuntu 13.04, 12.10 or 12.04. I have done the driver installation manually (instructions from wiki.cchtml.com) and using software center and there is no difference. I have not tried the catalyst 13.8 beta driver. 2) After manual installation of catalyst 13.4, I get stuck at a black screen after logging in. I have to purge fglrx to resolve the problem. I tried sudo amdconfig --initial -f but it didn't help. 3) The delay between logging in and unity being displayed is ~10-15s for BOTH open source and proprietary drivers. During the delay, it's just a black screen. Whenever I logout, there is again a ~10-15s delay with the login screen appearing stuck before lightdm allows me to enter my password again. This is ridiculous! Yes, I could stick with open source radeon drivers but I would like to install Steam and play my Valve collection on the machine. Is anybody else encountering similar issues?

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• What is the method to reset the Planar 1910m monitor?

  - by Richard J Foster

  My monitor (a Planar, apparently model number PL1910M) is not working. (It is flashing a green / orange sequence which I believe to be an error code. The sequence, in case it helps consists of orange and green three times quickly followed by a longer orange, then another green followed by a long period where both colors appear to be present). I vaguely recall a co-worker suffering from a similar problem, and our IT department "resetting" the monitor by holding down a certain set of keys as they apply power. Unfortunately, I do not remember what that key sequence was, our IT department is not responding, and the Planar web site is blocked by the content filtering firewall we have in place! What is the sequence to perform the reset? (For bonus geek-credit, what does the code mean... as if it indicates a blown component clearly a reset will not help me. ;-))

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• backface culling error (in world space)

  - by acrilige

  I write simple software renderer. In my pipeline i have stage of backface culling. But looks like it has some error (see picture). I perform culling right after world transformation (is it correct?). (i can't insert picture in post coz i don't have enough points, so i just upload it (cube model): http://imageshack.us/photo/my-images/705/bcerror.png/) Vector3F view_dir(0.0f, 0.0f, 1.0f); std::vector<Triangle> to_remove; for (Triangle &t : m_triangles) { Vector4F e1 = t.v2 - t.v1; Vector4F e2 = t.v3 - t.v1; Vector3F normal( e1.y * e2.z - e1.z * e2.y, e1.z * e2.x - e1.x * e2.z, e1.x * e2.y - e1.y * e2.x ); normal.Normalize(); float dot = Dot(view_dir, normal); if (dot <= 0) to_remove.push_back(t); } for (Triangle& t : to_remove) m_triangles.erase(std::remove(m_triangles.begin(), m_triangles.end(), t), m_triangles.end()); Camera sits in origin and points in screen (RH). What is the reason? For better explanation i upload picture with cube rotation screenshots: http://imageshack.us/photo/my-images/842/bcmove.png/ UPDATED: The error occurs only when triangle has non-zero offset from origin UPDATED 2: If i process backface culling in clip space (after transforming all vertices with view and projection matrix), and just check z coordinate of triangle normal - it works perfect... Can i perform culing RIGHT BEFORE view/proj transforms? In this case looks like culling will not depends of projection and it's not right?.. UPDATED 3: I found answer and will post it in two hours - again coz of reputation lack.

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• How to analyze data

  - by Subhash Dike

  We are working on an application that allows user to search/read some content in a particular domain. We wanted to add some capability in the app which can suggest user some content based on the usage pattern (analyze data based on frequency and relevance). Currently every time user search or read something we do store that information in backend database. We would like to use this data to present some additional content to user. Could someone explain what kind of tools will be required for such a job and any example? And what this concept is called, data analysis? data mining? business intelligence? or something else? Update: Sorry for being too broad, here is an example SQL Database (Just to give an idea, actual db is little different with normalization and stuff) Table: UserArticles Fields: UserName | ArticleId | ArticleTitle | DateVisited | ArticleCategory Table: CategoryArticles Fields: Category | Article Title | Author etc. One Category may have one more articles. One user may have read the same article multiple times (in this case we place additional entry in the user article table. Task: Use the information availabel in UserArticle table and rank categories in order which would be presented to user automatically in other part of application. Factors to be considered are frequency and recency. This might be possible through simple queries or may require specialized tools. Either way, the task is what mention above. I am not too sure which route to take, hence the question. Thoughts??

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• Application Launcher for Hyper-V Server

  - by peterchen

  We are currently in the process of setting up a HyperV R2 Server machine. Though there's not a lot we need to do wihtin the HyperV Server itself, the command line is sure minimalistic. There are a few administrative / Hardware Monitoring tools that we want to run on he machine itself (accessed through remote desktop). I am looking for a simple program/application launcher where we can hook up these maintenance tools (and one to open a new cmd.exe window in case I habitually close the one I'm working in!) However, all tools I tried by now more or less assume explorer is present, and fail in different ways. Before I go and write a simple one myself, any recommendations?

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• Chassis fans and power LEDs still work in Hibernate

  - by Jaded

  I have ASRock Z68 Extreme3 Gen3 motherboard recently updated to 2.20 BIOS version. OS is Windows 7 x64. The problem is after that update full hibernation (by that i mean full system power off) stopped working although everything was fine before. Now when I press hibernate, sleep in initiated as usual, monitor goes to sleep, HDD and CPU fan stop spinning, but chassis fans (i have Gigabyte Aurora 3D 570 case with two rear and one front fans) still remain working. Also power leds are lit as if computer is turned on. Tried changing different UEFI settings related to sleep mode, and none of them change above described behaviour. I have "Deep Sleep" (Advanced-South Bridge Configuration) set to "Enabled in S4-S5", "Suspend to RAM" (Advanced-ACPI Configuration) set to "Auto", all fans settings in "H/W Monitor" set to "Auto".

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• jQuery fading in an element - not working exactly as i want it to...

  - by Nike

  Anybody see what's wrong? Doesn't seem to do anything. If i replace $(this, '.inner').stop(true, false).fadeIn(250); with $(.fadeInOnHover .inner').stop(true, false).fadeIn(250); then all the .inner elements on the page will fade in (which isn't really what i want, as i have ~10 of them). I know it's possible to achieve what i want to do, but i don't know how in this case. Thanks in advance :) <script type="text/javascript"> $(document).ready(function() { $('.fadeInOnHover .inner').css("display","none"); $('.fadeInOnHover').hover(function() { $(this, '.inner').stop(true, false).fadeIn(250); }).mouseout(function() { $(this, '.inner').stop(true, true).fadeOut(100); }); }); </script>

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• Ubuntu 12.04.3 64 bit with Nemo 2.0.x no thumbnails

  - by Dr. Szrapnel

  I have strange problem with thumbnails in my Ubuntu machine. I was using Ubuntu with Cinnamon 1.8 from stable ppa and it was good but then Cinnamon 2.0 came out with some broken packages uploaded to stable ppa nad things gone wrong... Anyway after few updates Cinnamon started to work normaly except Nemo - there are no thumbnails at all, only icons. I heve tried purging /.cache/thumbnails and .thumbnails folders but this doesn't work. Next I have changed permissions for those folders - that didn't helped either. Then I've set Nemo as default file manager and desktop handler but with no result. What is weird - when I start Nautilus and open some folder with images then close it and open same folder with Nemo thumbnails appears but when I clean thumbnails directories there are no thumbnails again. It would be great if someone have some solution for this annoying Nemo behavior because I really don't want to resign from Cinnamon. p.s. I have set preview options in Nemo for Always and no bigger files than 4GB so that is not the case.

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• Adding extra fan on my setup. please advice on proper Exhaust or Intake of Fan.

  - by Pennf0lio

  Hi, I modify my Computer case so that I can add more computer fan to make my computer cool this summer. I would need your thoughts how I can improve my idea and I'm open to all of your advices. Status: Fan Position (The blue circles are the fan's location) At the side I have to intake blowing fresh air at the motherboard and at the top and back I have Exhaust fan blowing out hot air. The computer fans will be powered by 12v adapter (recycled) so that my power supply wouldn't be overloaded. I need a practical advice, I don't want to spend to much on this. Thanks.

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• KISS principle applied to programming language design?

  - by Giorgio

  KISS ("keep it simple stupid", see e.g. here) is an important principle in software development, even though it apparently originated in engineering. Citing from the wikipedia article: The principle is best exemplified by the story of Johnson handing a team of design engineers a handful of tools, with the challenge that the jet aircraft they were designing must be repairable by an average mechanic in the field under combat conditions with only these tools. Hence, the 'stupid' refers to the relationship between the way things break and the sophistication available to fix them. If I wanted to apply this to the field of software development I would replace "jet aircraft" with "piece of software", "average mechanic" with "average developer" and "under combat conditions" with "under the expected software development / maintenance conditions" (deadlines, time constraints, meetings / interruptions, available tools, and so on). So it is a commonly accepted idea that one should try to keep a piece of software simple stupid so that it easy to work on it later. But can the KISS principle be applied also to programming language design? Do you know of any programming languages that have been designed specifically with this principle in mind, i.e. to "allow an average programmer under average working conditions to write and maintain as much code as possible with the least cognitive effort"? If you cite any specific language it would be great if you could add a link to some document in which this intent is clearly expressed by the language designers. In any case, I would be interested to learn about the designers' (documented) intentions rather than your personal opinion about a particular programming language.

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• SpeedTracer NETWORK_RESOURCE_RESPONSE vs NETWORK_RESOURCE_FINISH

  - by Ben Flynn

  I'm using SpeedTracer with GoogleChrome to measure the load times of requested resources. The SpeedTracer site says: NETWORK_RESOURCE_RESPONSE "Indicates that the renderer has started receiving bits from the resource loader" NETWORK_RESOURCE_FINISH "Indictes a resource load is successful and complete." In my mind that means we would always see a network resource response (bytes are arriving) before we see a finish (all bytes received). This doesn't seem to be the case at all. Here is a sample: Request Timing @33519ms for 926ms Response Timing @34445ms for -847ms Total Timing @33519ms for 78ms I'm guessing response time isn't supposed to be negative. Can someone explain this or is this a bug? I'm using Chrome 10.0.612.3 dev with a SpeedTracer I downloaded today.

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• How to backup and restore ESXi 4 settings?

  - by Arek

  How can I backup all settings of free VMWare ESXi 4? I configured the host - VMs, Storage, Networking, Resource Allocation and all other settings available in vSphere Client. It consumed quite a lot of time, but works pretty well. Now I want to backup all the settings "just in case" to easily reinstall ESXi 4 if something goes really wrong. I don't ask "how to backup VMs" (so please don't point me to Ghetto-VCB script). I need to backup and restore just ESXi4 host's settings.

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• Varnish: User specific pages

  - by jchong0707

  I'm new to Varnish and am interested in using it to speed up my web application I wanted to know if Varnish can handle caching and serving user specific content. For example if I have a page say for example /welcome which is dynamically generated in the backend and is user specific So if User John Smith shows up to /welcome it'll show in the page itself 'Welcome John Smith' and if Bob Smith shows up to /welcome it'll show 'Welcome Bob Smith' Ideally both of those /welcome pages will be cached for each unique User, is this something Varnish can do? (is this even a good Use Case of Varnish?) Thanks!

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• Adding complexity by generalising: how far should you go?

  - by marcog

  Reference question: http://stackoverflow.com/questions/4303813/help-with-interview-question The above question asked to solve a problem for an NxN matrix. While there was an easy solution, I gave a more general solution to solve the more general problem for an NxM matrix. A handful of people commented that this generalisation was bad because it made the solution more complex. One such comment is voted +8. Putting aside the hard-to-explain voting effects on SO, there are two types of complexity to be considered here: Runtime complexity, i.e. how fast does the code run Code complexity, i.e. how difficult is the code to read and understand The question of runtime complexity is something that requires a better understanding of the input data today and what it might look like in the future, taking the various growth factors into account where necessary. The question of code complexity is the one I'm interested in here. By generalising the solution, we avoid having to rewrite it in the event that the constraints change. However, at the same time it can often result in complicating the code. In the reference question, the code for NxN is easy to understand for any competent programmer, but the NxM case (unless documented well) could easily confuse someone coming across the code for the first time. So, my question is this: Where should you draw the line between generalising and keeping the code easy to understand?

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