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• I'm a premature optimizer

  - by Matthew Day

  I work in a small sized software/web development company. I have gotten into the habit of optimizing prematurely, I know it is evil and promotes bad code... But I have been working at this firm for a long while and I have deemed this as a necessary evil. It has never caused me an issue so far in the past, but it might if I get partners or a successor. The point of this long-winded speech is that, should I change my evil practices to 'save face' and to help out in the future?

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• View space lighting in deferred shading

  - by kochol

  I implemented a simple deferred shading renderer. I use 3 G-Buffer for storing position (R32F), normal (G16R16F) and albedo (ARGB8). I use sphere map algorithm to store normals in world space. Currently I use inverse of view * projection matrix to calculate the position of each pixel from stored depth value. First I want to avoid per pixel matrix multiplication for calculating the position. Is there another way to store and calculate position in G-Buffer without the need of matrix multiplication Store the normal in view space Every lighting in my engine is in world space and I want do the lighting in view space to speed up my lighting pass. I want an optimized lighting pass for my deferred engine.

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• Why I loose my page rank after 301 redirect?

  - by rajesh.magar

  As we all know Google treat sub-domain as completely separate domain so we have to fight for both, to get ranked in search results. Right! So one of my client website was like they having "example.com" and "Blog.example.com". So in mind to keep all stuff in one place we redirect "blog.example.com" to "example.com/blog/" But in this case we where loose our pagerank and still wondering where we went wrong or it just take few more time to showoff. so what is the reason behind this will be. Thanks in advance.

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• OpenGL VBOs are slower then glDrawArrays.

  - by Arelius

  So, this seems odd to me. I upload a large buffer of vertices, then every frame I call glBindbuffer and then the appropriate gl*Pointer functions with offsets into the buffer, then I use glDrawArrays to draw all of my triangles. I'm only drawing about 100K triangles, however I'm getting about 15FPS. This is where it gets weird, if I change it to not call glBindBuffer, then change the gl*Pointer calls to be actual pointers into the array I have in system memory, and then call glDrawArrays the same, my framerate jumps up to about 50FPS. Any idea what I weird thing I could be doing that would cause this? Did I maybe forget to call glEnable(GL_ALLOW_VBOS_TO_RUN_FAST) or something?

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• How should I choose quadtree depth?

  - by Evpok

  I'm using a quadtree to prune collision detection pairs in a 2d world. How should I choose to what depth said quadtree is calculated? The world is made mostly of moving objects1, so the cost of dispatching the objects between the quadtree cells matters. What is the relationship between the gain from less collision checking and the loss from more dispatching? How can I strike a balance that performs optimally? 1 To be completely explicit, they are autonomous self-replicating cells competing for food sources. This is an attempt to show my pupils predator-prey dynamics and genetic evolution at work.

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• I'm seeing a lot of a new format for title elements for major sites: a few tags, and only then the title of the site itself, is this now optimal SEO?

  - by Tchalvak

  I'm seeing a lot of sites go to a format similar to the one now in use by stackexchange sites (i.e. short topic - maybe a long topic - only finally the site's name). Is this optimal SEO? It seems kind weird both because I'm only begun to notice changes in this direction recently, and because it seems like it would make it harder to tell in search results which actual site you're visiting, even if the topic is one that matches. Still, sites like Facebook, StackOverflow, etc probably aren't wrong, so I'm wondering if I should try to make my sites use that format, going forwards...

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• FxCop / Code Analysis with VS2010 Ultimate

  - by Cuartico

  I've getting some information about this, but I still can find a proper answer, I was asked recently in my company for this : "run a fxcop analysis on that code and tell me the results". Ok, I have VS2010 Ultimate which has code analysis, but before making any comment, I browse it on the internet cause I want to implement the best choice... So, let's say I'm gonna use the same rules on both analyzers: Should I recommend using one above the other? Should I say "hey, thats kinda old, let's use code analysis!" Should I get the same results on different computers? (for what I undersand, fxcop gives you some "points" and for what I've read, sometimes it gives you diff points on diff computers, I don't know about this with code analysis Thanks, any help would be appreciated

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• How do I optimize SEO in a multiblog WordPress install?

  - by user35585

  We are about to launch two product pages plus a corporate website. The goal is to keep a blog in all of the sites, but here it comes the question about how to do it in a way we get everything unified but do not mess with Google's web crawlers. We considered the following options: Putting a blog from which we retrieve two categories with custom CSS, so we have a blog that sub splits two category-dependent blogs; this way we can get the feeds and will point to it Putting two product blogs of which we retrieve their posts into a bigger, corporate blog Putting three independent blogs Despite I was for the first option, so we only have to address our content from the product pages, I would sincerely like to hear your opinion. We are afraid duplicate content or strange link games may make us lose PageRank. How would you do it?

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• How can I maximum compress video files?

  - by EmmyS

  I received 4 .mov files from a client that they want on their mobile website via SlideShowPro. Each original file was between 200 and 400 mb. I've gotten each one down to about 30 mb using transmageddon as described here, but that's still really big for a mobile connection. Is there any way to shrink them even further? Maybe it's the settings; I used Output Format = MPEG4, Audio = AAC, Video = H264 (which is what is suggested by SlideShowPro.)

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• Cheap ways to do scaling ops in shader?

  - by Nick Wiggill

  I've got an extensive world terrain that uses vec3 for the vertex position attribute. That's good, because the terrain has endless gradations due to the use of floating point. But I'm thinking about how to reduce the amount of data uploaded to the GPU. For my terrain, which uses discrete / grid-based vertex positions in x and z, it's pretty clear that I can replace my vec3s (floats, really) with shorts, halving the per-vertex position attribute cost from 12 bytes each to 6 bytes. Considering I've got little enough other vertex data, and an enormous amount of terrain data to push into the world, it's a major gain. Currently in my code, one unit in GLSL shaders is equal to 1m in the world. I like that scale. If I move over to using shorts, though, I won't be able to use the same scale, as I would then have a very blocky world where every step in height is an entire metre. So I see these potential solutions to scale the positional data correctly once it arrives at the vertex shader stage: Use 10:1 scaling, i.e. 1 short unit = 1 decimetre in CPU-side code. Do a division by 10 in the vertex shader to scale incoming decimetre values back to metres. Arbirary (non-PoT) divisions tend to be slow, however. Use (some-power-of-two):1 scaling (eg. 8:1), which enables the use of a bitshift (eg. val >> 3) to do the division... not sure how performant this is in shaders, though. Not as intuitive to read values, but possibly quite a bit faster than div by a non-PoT value. Use a texture as lookup table. I've heard that this is really fast. Or whatever solutions others can offer to achieve the same results -- minimal vertex data with sensible scaling.

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• Long 'Wait' Time for three php/CSS files. Is something blocking them?

  - by William Pitcher

  I have been speed optimizing a Wordpress site to little effect. There are three files CSS-related php files from the Wordpress theme that are delaying page loads on the site. One of the three files is basically one line of custom CSS from the custom CSS feature in the theme. You can see what I am talking about with this Pingdom speed test: The yellow is 'Wait'. There are no slow items in the cut-off portion of the image. The full results are here: Pingdom Results Page 1. Any thoughts on what might be causing this? I understand that I have blocking CSS or JS files, but I don't see anything that would be causing that long of a wait. When I ran the P3 Plugin Profiler, Wordpress and all plugins appeared fine -- it is the theme that is taking all the time. GTmetrix recommends avoiding dynamic queries. I assume all the ver=3.61 references are to the version of Wordpress (which I am using). I noticed that my Wordpress sites using other themes don't make this query (at least not over and over). 2. Is this typical coding practice? 3. How much negative impact do these query-strings have -- a little or a lot? I tried searching for similar questions here, please excuse me if I missed something. Sometimes, I know just enough to be dangerous.

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• Why I lose my page rank after 301 redirect?

  - by rajesh.magar

  As we all know Google treats sub-domains as completely separate domains so we have to fight for both, to get ranked in search results. One of my client website was like they having example.com and blog.example.com. So in mind to keep all stuff in one place we redirect blog.example.com to example.com/blog/ But in this case we lost our pagerank and are still wondering where we went wrong or it just takes few more time to showoff. So what is the reason behind this?

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• Optimising news fetching

  - by aceBox

  I have a web scraper for scraping news from different sources in wp7. My current appraoch for doing this is: load newspapers information from xml file. go to the specified sections and fetch the urls of the news items. go to each url and fetch headline, image, publisher. display using a MVVM architecture of windows phone. The whole thing takes place asynchronously...meaning as soon as url from a section of a newspaper is fetched it is added to the queue, and the second stage consisting of fetching headline, image etc starts... and as soon this is fetched even for one article, it is displayed. Later on as more articles are fetched, they are added on to the list. For the fetching purpose I am using a SmartThreadPool(http://www.codeproject.com/Articles/7933/Smart-Thread-Pool) for windows phone. My problem is that...even for fetching around 80 items (in total) from 9 publications, it is taking more than a minute. How can i speed up the procedure? Note: I have a two stage approach because many times the images are not available with headlines, and are only found in the article.

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• How to get experience in large scale databases?

  - by Justin

  I have written applications that are very small scale and the code I write works fine for them. But I have often wondered how the server side code I write would scale up from 100s of queries per day to millions. Also when looking at possible jobs/projects, people are often looking for developers with experience in this sort of high traffic database design so I would at least like to be able to say, I havent gotten to work on a project that was this popular, but I at least have tried to simulate it. Are there tools or frameworks that can generate a lot of traffic or at least simulate what would happen with traffic on different orders of magnitude so I could get some practice writing optimized code for higher traffic applicaitons?

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• Maya and Game Engines (i.e. Environment Testing)

  - by DiscreteGenius

  What does it mean if I'm designing an environment and I want to test it in the game engine, to see what its like to "run" [or fly] around my environment? I heard an instructor say that exact thing in a Maya training video and I'd like to know more about "How Game Engines and Maya are related to each other." He stated this would be done to see how things look in "size" (e.g. I assume he meant: 'How big is the cathedral, bridge, wall, building, etc.'). I've tried to research such information but it's too complicated, and detailed. I just want a simplistic response to my query. Thanks to everyone willing to help and not criticize my question.

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• How to smartly optimize ads on website

  - by YardenST

  I've a content website that presents ads. Now, my team want to optimize it for a better experience for the users. (we really believe our ads are good for our users.) We are sure that every website deals with this issue and there must be some known ways and methods to deal with it, that smart people thought of before. so what i'm looking is a tested, working method to optimize ads. for example: if i was asking about optimizing my website in Google, I would expect you to answer me: learn SEO if i was asking about optimizing the use of my website: usability testing. navigation: information architecture what is the field that deals with optimizing ads?

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• How to have an Arduino wait until it receives data over serial?

  - by SonicDH

  So I've wired up a little robot with a sound shield and some sensors. I'm trying to write a sketch that will let check the sensors. What I'd like for it to do is print out a little menu over serial, wait until the user sends a selection, jump to the function that matches their selection, then (once the function is done) jump back and print the menu again. Here's what I've written, but I'm not a that good of a coder, so it doesn't work. Where am I going wrong? #include <Servo.h> Servo steering; Servo throttle; int pos = 0; int val = 0; void setup(){   Serial.begin(9600);   throttle.write(90);   steering.write(90);   pinMode(A0, INPUT);   pinMode(7, INPUT);   char ch = 0; } void loop(){   Serial.println("Menu");   Serial.println("--------------------");   Serial.println("1. Motion Readout");   Serial.println("2. Distance Readout");   Serial.println("3. SD Directory Listing");   Serial.println("4. Sound Test");   Serial.println("5. Car Test");   Serial.println("--------------------");   Serial.println("Type the number and press enter");   while(char ch = 0){   ch = Serial.read();}   char ch;   switch(ch)   {     case '1':     motion();   }    ch = 0; } //menu over, lets get to work. void motion(){   Serial.println("Haha, it works!"); } I'm pretty sure a While loop is the right thing to do, but I'm probably implementing it wrong. Can anyone shed some light on this?

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• Need ideas on how to give my levels structure

  - by akuritsu

  I am making an iOS game for a project at school. It is going to be a tiny bit like Fruit Ninja, as in it will have different things on the screen, and when you hit them, they die, and you get points. The trouble is that unlike Fruit Ninja, my game will have different types of sprites, all doing different things (moving different places, doing different things, etc). The one thing that is bad about having all of these sprites that do different things is that it is hard for them to look neat on the screen all together. I was planning on having a couple of different gamemodes: Time Trial You have 120 seconds to kill as many sprites as possible. Survival You have three lives, every time you try to hit a sprite and miss, you lose a life. ???? Whatever I think of. I am a rookie to game design in general, and I don't know the best way to make my game look good, and play well. I could have all of these sprites on the screen at the same time, or I could have them come in waves, for example 10 of sprite_a come on, and once they are killed, 10 of sprite_b come on, etc... Please give me your opinion about which one I should code. If you have any other suggestions for either a third gamemode, or a completely different way to make the levels, feel free to tell me.

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• Is there a downside of running too many Symfony applications for 1 website?

  - by gentrobot

  Recently I got access to a Symfony 1.2 project which is for just 1 website, but with too many applications. In the past, I have developed websites but with not more than 2 or 3 applications. The cross-application links are achieved by passing the full URL to the 'href' attribute. Since the site is still working absolutely fine, my question is will having too many front controllers (approximately 25-30) hamper the performance of the website? Should I just try to create Cross Application Links or put an additional effort in combining similar applications (I guess almost all of the site's frontend part) into 1 application but different modules ?

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• How to design Character,Game Background.,Which Software to use?

  - by TicTech

  Yesterday i Downloaded 4 GB of Videos & ZBrush for Character design but now i realize that i want to make 2D Character and background for my Android Game. so it was a waste for me i don't want to waste my other bandwidth and my Energy on some other Tut. So i am Here for a advice my Question is. 1.Which software to draw and color Character, making Background ? 2.Is there any Video Tut or Ebook for the software to draw Character .i know Basic of Photoshop i learned from Lynda Please help me i am experienced in Android SDK so that's not a prob. for me but in designing i don't know anything any Help will be Really Appreciated Thanks.

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• How to test whether an image is already in cache? [migrated]

  - by Evik James

  I am developing a web site that has a lot of large, high-quality images on the home page. On the home page, there is an image carousel that pulls ten high quality images from a database. The images can be 1 meg each. The carousel images aren't my problem (right now), but it has something to do with it. The problem I am trying to address right now is that I use a high quality background image that I want to continue using, it's about 180k. If I have the background in cache on the home page, I want to use it. If not, then I don't want to use it on the home page. I'll load it from a different page. When the user returns to the home page, and the background image is in cache, I want to use it. Can I test whether an image is already in cache and if so, dynamically load or NOT load based on that? You can see the home page here: http://flyingpiston2012-com.securec37.ezhostingserver.com/

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• Most efficient Implementation a Tree in C++

  - by Topo

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

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• Optimize bootup sequence

  - by ubuntudroid

  I'm on Ubuntu 11.04 (upgraded from 10.10) and suffering really high bootup times. It got so annoying, that I decided to dive into bootchart analysis myself. Therefore I installed bootchart and restarted the system which generated this chart. However, I'm not really experienced in reading such stuff. What causes the long bootup sequence? Edit: Here is the output of hdparm -i /dev/sda: /dev/sda: Model=SAMSUNG HD501LJ, FwRev=CR100-12, SerialNo=S0MUJ1EQ102621 Config={ Fixed } RawCHS=16383/16/63, TrkSize=34902, SectSize=554, ECCbytes=4 BuffType=DualPortCache, BuffSize=16384kB, MaxMultSect=16, MultSect=16 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=976773168 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6 AdvancedPM=no WriteCache=enabled Drive conforms to: unknown: ATA/ATAPI-3,4,5,6,7 * signifies the current active mode And here the output of hdparm -tT /dev/sda /dev/sda: Timing cached reads: 2410 MB in 2.00 seconds = 1205.26 MB/sec Timing buffered disk reads: 258 MB in 3.02 seconds = 85.50 MB/sec

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• How to Optimize Stored Procedures

  - by Derek D.

  There are many factors to speeding up stored procedures. Knowing these in advance can save you and your company many hours of headaches. Using these practices when writing procedures, you can turn your SQL Server into a fine-tuned machine. This tutorial will cover the specifics to help you tune your procedures optimally. Know [...]

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• How to reverse engineer the SEO on a website?

  - by Startup Crazy

  I have read this question. My question is a bit different from it. I want to know how can I reverse engineer another website that is ranking the best for some keywords. For example some website called www.bla.com is there and it ranks high for many keywords and I want to learn from it how can my website be of the same authority and get the same ranking (or probably better ranking if I found something that they are missing). Can anyone enlist it as a procedure, how to reverse engineer a website?

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