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• High CPU usage on Pong clone

  - by max

  I just made my first game, a clone of Pong, using OpenGL and C++. But its using ~50% of the CPU, which I guess is very high for a game like this. How can I improve that? Can you please look up my code and tell me what all things I am doing wrong? Any feedback is welcome. http://pastebin.com/L5zE3axh Also it would be extremely helpful if you give some general points on how to develop games in OpenGL efficiently.. Thanks in advance!

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• High Availability for IaaS, PaaS and SaaS in the Cloud

  - by BuckWoody

  Outages, natural disasters and unforeseen events have proved that even in a distributed architecture, you need to plan for High Availability (HA). In this entry I'll explain a few considerations for HA within Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS). In a separate post I'll talk more about Disaster Recovery (DR), since each paradigm has a different way to handle that. Planning for HA in IaaS IaaS involves Virtual Machines - so in effect, an HA strategy here takes on many of the same characteristics as it would on-premises. The primary difference is that the vendor controls the hardware, so you need to verify what they do for things like local redundancy and so on from the hardware perspective. As far as what you can control and plan for, the primary factors fall into three areas: multiple instances, geographical dispersion and task-switching. In almost every cloud vendor I've studied, to ensure your application will be protected by any level of HA, you need to have at least two of the Instances (VM's) running. This makes sense, but you might assume that the vendor just takes care of that for you - they don't. If a single VM goes down (for whatever reason) then the access to it is lost. Depending on multiple factors, you might be able to recover the data, but you should assume that you can't. You should keep a sync to another location (perhaps the vendor's storage system in another geographic datacenter or to a local location) to ensure you can continue to serve your clients. You'll also need to host the same VM's in another geographical location. Everything from a vendor outage to a network path problem could prevent your users from reaching the system, so you need to have multiple locations to handle this. This means that you'll have to figure out how to manage state between the geo's. If the system goes down in the middle of a transaction, you need to figure out what part of the process the system was in, and then re-create or transfer that state to the second set of systems. If you didn't write the software yourself, this is non-trivial. You'll also need a manual or automatic process to detect the failure and re-route the traffic to your secondary location. You could flip a DNS entry (if your application can tolerate that) or invoke another process to alias the first system to the second, such as load-balancing and so on. There are many options, but all of them involve coding the state into the application layer. If you've simply moved a state-ful application to VM's, you may not be able to easily implement an HA solution. Planning for HA in PaaS Implementing HA in PaaS is a bit simpler, since it's built on the concept of stateless applications deployment. Once again, you need at least two copies of each element in the solution (web roles, worker roles, etc.) to remain available in a single datacenter. Also, you need to deploy the application again in a separate geo, but the advantage here is that you could work out a "shared storage" model such that state is auto-balanced across the world. In fact, you don't have to maintain a "DR" site, the alternate location can be live and serving clients, and only take on extra load if the other site is not available. In Windows Azure, you can use the Traffic Manager service top route the requests as a type of auto balancer. Even with these benefits, I recommend a second backup of storage in another geographic location. Storage is inexpensive; and that second copy can be used for not only HA but DR. Planning for HA in SaaS In Software-as-a-Service (such as Office 365, or Hadoop in Windows Azure) You have far less control over the HA solution, although you still maintain the responsibility to ensure you have it. Since each SaaS is different, check with the vendor on the solution for HA - and make sure you understand what they do and what you are responsible for. They may have no HA for that solution, or pin it to a particular geo, or perhaps they have a massive HA built in with automatic load balancing (which is often the case).   All of these options (with the exception of SaaS) involve higher costs for the design. Do not sacrifice reliability for cost - that will always cost you more in the end. Build in the redundancy and HA at the very outset of the project - if you try to tack it on later in the process the business will push back and potentially not implement HA. References: http://www.bing.com/search?q=windows+azure+High+Availability  (each type of implementation is different, so I'm routing you to a search on the topic - look for the "Patterns and Practices" results for the area in Azure you're interested in)

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• My rhythm game runs choppy even with high frame rate

  - by felipedrl

  I'm coding a rhythm game and the game runs smoothly with uncapped fps. But when I try to cap it around 60 the game updates in little chunks, like hiccups, as if it was skipping frames or at a very low frame rate. The reason I need to cap frame rate is because in some computers I tested, the fps varies a lot (from ~80 - ~250 fps) and those drops are noticeable and degrade response time. Since this is a rhythm game this is very important. This issue is driving me crazy. I've spent a few weeks already on it and still can't figure out the problem. I hope someone more experienced than me could shed some light on it. I'll try to put here all the hints I've tried along with two pseudo codes for game loops I tried, so I apologize if this post gets too lengthy. 1st GameLoop: const uint UPDATE_SKIP = 1000 / 60; uint nextGameTick = SDL_GetTicks(); while(isNotDone) { // only false when a QUIT event is generated! if (processEvents()) { if (SDL_GetTicks() > nextGameTick) { update(UPDATE_SKIP); render(); nextGameTick += UPDATE_SKIP; } } } 2nd Game Loop: const uint UPDATE_SKIP = 1000 / 60; while (isNotDone) { LARGE_INTEGER startTime; QueryPerformanceCounter(&startTime); // process events will return false in case of a QUIT event processed if (processEvents()) { update(frameTime); render(); } LARGE_INTEGER endTime; do { QueryPerformanceCounter(&endTime); frameTime = static_cast<uint>((endTime.QuadPart - startTime.QuadPart) * 1000.0 / frequency.QuadPart); } while (frameTime < UPDATE_SKIP); } [1] At first I thought it was a timer resolution problem. I was using SDL_GetTicks, but even when I switched to QueryPerformanceCounter, supposedly less granular, I saw no difference. [2] Then I thought it could be due to a rounding error in my position computation and since game updates are smaller in high FPS that would be less noticeable. Indeed there is an small error, but from my tests I realized that it is not enough to produce the position jumps I'm getting. Also, another intriguing factor is that if I enable vsync I'll get smooth updates @60fps regardless frame cap code. So why not rely on vsync? Because some computers can force a disable on gfx card config. [3] I started printing the maximum and minimum frame time measured in 1sec span, in the hope that every a few frames one would take a long time but still not enough to drop my fps computation. It turns out that, with frame cap code I always get frame times in the range of [16, 18]ms, and still, the game "does not moves like jagger". [4] My process' priority is set to HIGH (Windows doesn't allow me to set REALTIME for some reason). As far as I know there is only one thread running along with the game (a sound callback, which I really don't have access to it). I'm using AudiereLib. I then disabled Audiere by removing it from the project and still got the issue. Maybe there are some others threads running and one of them is taking too long to come back right in between when I measured frame times, I don't know. Is there a way to know which threads are attached to my process? [5] There are some dynamic data being created during game run. But It is a little bit hard to remove it to test. Maybe I'll have to try harder this one. Well, as I told you I really don't know what to try next. Anything, I mean, anything would be of great help. What bugs me more is why at 60fps & vsync enabled I get an smooth update and at 60fps & no vsync I don't. Is there a way to implement software vsync? I mean, query display sync info? Thanks in advance. I appreciate the ones that got this far and yet again I apologize for the long post. Best Regards from a fellow coder.

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• eSeminar ISV Partner Update: High Quality Reporting for Your Applications

  - by Mike.Hallett(at)Oracle-BI&EPM

  Play eSeminar Duration: 18 Minutes         Description: This webinar presents to ISV Partners Oracle’s latest release of BI Publisher, and describes how this tool can make their applications more competitive and appealing to their customers by providing High Quality Reporting and Business Intelligence embedded into their solution. • BI Publisher can Provide All Reports… at Lower Cost • Easier, with Better Developer Productivity • Better Managed : Better Performance, Less Administration • Highest Quality : Pixel Perfect and Interactive Reporting. Play eSeminar (Only accessible to Oracle Partners).

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• Using High Level Abstractions

  - by Jonn

  I'm not sure if I'm using the correct term, but would you program using High-level abstractions like Powerbuilder, or some CMS like MODx or DotNetNuke? I haven't dabbled in any of these yet. The reason I'm asking is that I kind of feel intimidated by the whole notion of using any abstraction over the languages I'm using. I'm thinking that my job might be over-simplified. While it may provide business solutions faster, I'd rather be coding straight from, in my case, .NET. Do/Would you use abstractions like these or prefer them over programming in lower level languages?

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• Google I/O 2012 - High Performance HTML5

  Google I/O 2012 - High Performance HTML5 For years we built web apps that far outpaced the capabilities of the browsers they ran in. Just as the browsers were catching up HTML5 came on the scene - video and audio, canvas, SVG, app cache, localStorage, @font-face, and more. Now the browsers are racing to stay ahead of the wave that's building as developers adopt these new capabilities. Is your HTML5 app going to ride the wave or be dashed on the rocks leaving users stranded? Learn which HTML5 features to seek out and which to avoid when it comes to building fast HTML5 web apps. This session will be live captioned. From: GoogleDevelopers Views: 91 1 ratings Time: 01:02:07 More in Science & Technology

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• High temperature on my laptop with Radeon Mobility HD4670

  - by Lorthirk

  As almost everyone here, I guess, in these days I downloaded Quantal Quetzal to give it a try. However I noticed that my laptop runs fairly hot with cooling fans almost always on, even sitting in the desktop doing nothing. I downloaded XSensor to read temperature sensors, and I saw that while CPU stays on about 65°C, so quiet normal I guess, the GPU sits at 75°C. In comparison my actual Windows 7 installation, which dual boots witb Quantal, stays at 59°C CPU and 65°C. So I went reading and learned that AMD dropped support for my video card from fglrx package, and that fglrx-legacy won't support 1.13 Xorg, so I'm basically stuck with OSS drivers. So I was guessing if there's anything I can try, and if it's possible that the OSS drivers could be the cause of the high temperature?

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• gnome shell with very high CPU usage

  - by 501 - not implemented

  i'm running ubuntu gnome 13.10 on my dell latiude e6510 with a i5 m560. The I5 comes with a embedded Intel HD 3400 Graphics. The average cpu usage of the gnome-shell is by 160% it's to high, I think. Is there a problem with a driver? If i call the command glxinfo | grep OpenGL it returns: OpenGL vendor string: VMware, Inc. OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.3, 128 bits) OpenGL version string: 2.1 Mesa 9.2.1 OpenGL shading language version string: 1.30 OpenGL extensions: Greetings

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• Pathfinding results in false path costs that are too high

  - by user2144536

  I'm trying to implement pathfinding in a game I'm programming using this method. I'm implementing it with recursion but some of the values after the immediate circle of tiles around the player are way off. For some reason I cannot find the problem with it. This is a screen cap of the problem: The pathfinding values are displayed in the center of every tile. Clipped blocks are displayed with the value of 'c' because the values were too high and were covering up the next value. The red circle is the first value that is incorrect. The code below is the recursive method. //tileX is the coordinates of the current tile, val is the current pathfinding value, used[][] is a boolean //array to keep track of which tiles' values have already been assigned public void pathFind(int tileX, int tileY, int val, boolean[][] used) { //increment pathfinding value int curVal = val + 1; //set current tile to true if it hasn't been already used[tileX][tileY] = true; //booleans to know which tiles the recursive call needs to be used on boolean topLeftUsed = false, topUsed = false, topRightUsed = false, leftUsed = false, rightUsed = false, botomLeftUsed = false, botomUsed = false, botomRightUsed = false; //set value of top left tile if necessary if(tileX - 1 >= 0 && tileY - 1 >= 0) { //isClipped(int x, int y) returns true if the coordinates givin are in a tile that can't be walked through (IE walls) //occupied[][] is an array that keeps track of which tiles have an enemy in them // //if the tile is not clipped and not occupied set the pathfinding value if(isClipped((tileX - 1) * 50 + 25, (tileY - 1) * 50 + 25) == false && occupied[tileX - 1][tileY - 1] == false && !(used[tileX - 1][tileY - 1])) { pathFindingValues[tileX - 1][tileY - 1] = curVal; topLeftUsed = true; used[tileX - 1][tileY - 1] = true; } //if it is occupied set it to an arbitrary high number so enemies find alternate routes if the best is clogged if(occupied[tileX - 1][tileY - 1] == true) pathFindingValues[tileX - 1][tileY - 1] = 1000000000; //if it is clipped set it to an arbitrary higher number so enemies don't travel through walls if(isClipped((tileX - 1) * 50 + 25, (tileY - 1) * 50 + 25) == true) pathFindingValues[tileX - 1][tileY - 1] = 2000000000; } //top middle if(tileY - 1 >= 0 ) { if(isClipped(tileX * 50 + 25, (tileY - 1) * 50 + 25) == false && occupied[tileX][tileY - 1] == false && !(used[tileX][tileY - 1])) { pathFindingValues[tileX][tileY - 1] = curVal; topUsed = true; used[tileX][tileY - 1] = true; } if(occupied[tileX][tileY - 1] == true) pathFindingValues[tileX][tileY - 1] = 1000000000; if(isClipped(tileX * 50 + 25, (tileY - 1) * 50 + 25) == true) pathFindingValues[tileX][tileY - 1] = 2000000000; } //top right if(tileX + 1 <= used.length && tileY - 1 >= 0) { if(isClipped((tileX + 1) * 50 + 25, (tileY - 1) * 50 + 25) == false && occupied[tileX + 1][tileY - 1] == false && !(used[tileX + 1][tileY - 1])) { pathFindingValues[tileX + 1][tileY - 1] = curVal; topRightUsed = true; used[tileX + 1][tileY - 1] = true; } if(occupied[tileX + 1][tileY - 1] == true) pathFindingValues[tileX + 1][tileY - 1] = 1000000000; if(isClipped((tileX + 1) * 50 + 25, (tileY - 1) * 50 + 25) == true) pathFindingValues[tileX + 1][tileY - 1] = 2000000000; } //left if(tileX - 1 >= 0) { if(isClipped((tileX - 1) * 50 + 25, (tileY) * 50 + 25) == false && occupied[tileX - 1][tileY] == false && !(used[tileX - 1][tileY])) { pathFindingValues[tileX - 1][tileY] = curVal; leftUsed = true; used[tileX - 1][tileY] = true; } if(occupied[tileX - 1][tileY] == true) pathFindingValues[tileX - 1][tileY] = 1000000000; if(isClipped((tileX - 1) * 50 + 25, (tileY) * 50 + 25) == true) pathFindingValues[tileX - 1][tileY] = 2000000000; } //right if(tileX + 1 <= used.length) { if(isClipped((tileX + 1) * 50 + 25, (tileY) * 50 + 25) == false && occupied[tileX + 1][tileY] == false && !(used[tileX + 1][tileY])) { pathFindingValues[tileX + 1][tileY] = curVal; rightUsed = true; used[tileX + 1][tileY] = true; } if(occupied[tileX + 1][tileY] == true) pathFindingValues[tileX + 1][tileY] = 1000000000; if(isClipped((tileX + 1) * 50 + 25, (tileY) * 50 + 25) == true) pathFindingValues[tileX + 1][tileY] = 2000000000; } //botom left if(tileX - 1 >= 0 && tileY + 1 <= used[0].length) { if(isClipped((tileX - 1) * 50 + 25, (tileY + 1) * 50 + 25) == false && occupied[tileX - 1][tileY + 1] == false && !(used[tileX - 1][tileY + 1])) { pathFindingValues[tileX - 1][tileY + 1] = curVal; botomLeftUsed = true; used[tileX - 1][tileY + 1] = true; } if(occupied[tileX - 1][tileY + 1] == true) pathFindingValues[tileX - 1][tileY + 1] = 1000000000; if(isClipped((tileX - 1) * 50 + 25, (tileY + 1) * 50 + 25) == true) pathFindingValues[tileX - 1][tileY + 1] = 2000000000; } //botom middle if(tileY + 1 <= used[0].length) { if(isClipped((tileX) * 50 + 25, (tileY + 1) * 50 + 25) == false && occupied[tileX][tileY + 1] == false && !(used[tileX][tileY + 1])) { pathFindingValues[tileX][tileY + 1] = curVal; botomUsed = true; used[tileX][tileY + 1] = true; } if(occupied[tileX][tileY + 1] == true) pathFindingValues[tileX][tileY + 1] = 1000000000; if(isClipped((tileX) * 50 + 25, (tileY + 1) * 50 + 25) == true) pathFindingValues[tileX][tileY + 1] = 2000000000; } //botom right if(tileX + 1 <= used.length && tileY + 1 <= used[0].length) { if(isClipped((tileX + 1) * 50 + 25, (tileY + 1) * 50 + 25) == false && occupied[tileX + 1][tileY + 1] == false && !(used[tileX + 1][tileY + 1])) { pathFindingValues[tileX + 1][tileY + 1] = curVal; botomRightUsed = true; used[tileX + 1][tileY + 1] = true; } if(occupied[tileX + 1][tileY + 1] == true) pathFindingValues[tileX + 1][tileY + 1] = 1000000000; if(isClipped((tileX + 1) * 50 + 25, (tileY + 1) * 50 + 25) == true) pathFindingValues[tileX + 1][tileY + 1] = 2000000000; } //call the method on the tiles that need it if(tileX - 1 >= 0 && tileY - 1 >= 0 && topLeftUsed) pathFind(tileX - 1, tileY - 1, curVal, used); if(tileY - 1 >= 0 && topUsed) pathFind(tileX , tileY - 1, curVal, used); if(tileX + 1 <= used.length && tileY - 1 >= 0 && topRightUsed) pathFind(tileX + 1, tileY - 1, curVal, used); if(tileX - 1 >= 0 && leftUsed) pathFind(tileX - 1, tileY, curVal, used); if(tileX + 1 <= used.length && rightUsed) pathFind(tileX + 1, tileY, curVal, used); if(tileX - 1 >= 0 && tileY + 1 <= used[0].length && botomLeftUsed) pathFind(tileX - 1, tileY + 1, curVal, used); if(tileY + 1 <= used[0].length && botomUsed) pathFind(tileX, tileY + 1, curVal, used); if(tileX + 1 <= used.length && tileY + 1 <= used[0].length && botomRightUsed) pathFind(tileX + 1, tileY + 1, curVal, used); }

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• Is there a javascript library that contains a rich set of very high level commonly used functions?

  - by bobo

  I find that many high level functions are missing in most well-known javascript libraries such as jquery, YUI...etc. Taking string manipulation as an example, startsWith, endsWith, contains, lTrim, rTrim, trim, isNullOrEmpty...etc. These function are actually very common ones. I would like to know if there exists a javascript library/ plugin of a javascript library that fills these gaps (including but not limited to string manipulation)? It would be great if the library does not override the prototype.

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• High Tq values for HAProxy

  - by Will

  I just took over administration of a new environment. A known issue is that the environment is known for high response times (20+ seconds), so I figured I'd turn on haproxy logging and see what is going on. I figured I'd see slow load times in the app servers, but I'm actually seeing high Tq values in HAProxy. The HAProxy is on EC2 and is NOT behind ELB. Sep 5 14:22:00 haproxy-apps01 haproxy[24695]: 76.14.153.221:3371 [05/Sep/2012:14:21:49.780] http-in default_apps/fe04-c 10936/0/0/55/10991 200 488 - - ---- 111/111/0/1/0 0/0 "GET /event_times/next?callback=jQuery170189312373075111_1346854917562&_=1346854918453 HTTP/1.1" As you can see, this one has a Tq of about 10 seconds. Not all the Tq's are high (1+ seconds), but a good percentage of them are (approx 35%). Normally when I see this behavior, I'd expect there to be network issues, but this is an incredibly high percentage of visitors to be having an issue like this, so I'm wondering if anybody has seen this or have any hints on diagnosing if the issue could possibly be on this box?

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• Delete until previous punctuation mark in Bash

  - by hekevintran

  In Bash, Ctrl + W will erase the last word. Bash considers words to be delimited by spaces. This means that if the cursor is at the end of the string "cd /dir1/dir2/dir3" and you hit Ctrl + W you will be left with "cd ". Is there a Bash shortcut (custom defined is okay) that will leave me with "cd /dir1/dir2/"?

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• Find which php scripts cause high CPU with php-cgi

  - by Oli

  Background: I maintain a server for a client who has half a dozen Wordpress sites on. They all have the W3 Total Cache plugin installed and eAcellerator is installed (might be APC). All the PHP sites run through a single batch of fastcgi php-cgi processes (it's actually php-fpm but I'm not sure if that makes a difference). Problem: php-cgi's CPU usage is quite high. Not terminally high but high enough to raise an eyebrow. The client wants to add more sites in the future and I want to avoid becoming CPU limited if I can help it. Question: Is there any way I can find the scripts or even just requests that are causing the high CPU. I realise I might not be able to do anything with the results but it would give me a chance.

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• HP ProCurve Port Mode Configuration Question Mark 2

  - by SvrGuy

  We have a ProCurve Switch 2810-48G (J9022A). We need to disable auto negotiation on two ports and manually configure them to be full duplex gige ports. From the web GUI, Configuration Tab, Port Configuration sub tab, I am only presented with the option to configure the port as Auto - 1000. I take this to mean, auto negotiate duplex, manually configure the speed to be gige. From the CLI when I try to set 1000-full I get the following error: Value 1000-full is not applicable to port 39 (or whatever port I try) The exact commands I have entered are: config interface 39 speed-duplex 1000-full BTW: speed-duplex auto-1000 works ( I also tried full-1000 and that did not work either) How do I manually configure the port such that it is manually configured to use full duplex, 1000 mbs?

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• Good book for building high performance web sites?

  - by Arne Evertsson

  Any recommendations for a book about building and running high performance, high-availability web sites on Linux?

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• Outlook 2007: Automatically mark a mail when printed

  - by Mestika

  Hi, I am looking for a solution for my Outlook 2007. I don’t know if it is possible, but what I need is, that each time I print a mail, it automatically get marked in some way, either by a flag or a category. I’ve browsed through different menus, settings and rules in outlook and scouted google for a solution but with no result. Don’t know if it makes a difference, but my outlook is connected to a Exchange server 2010. I would really appreciate if someone knew a solution to this. Sincere Mestika

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• Configure spamassassin to mark very similar messages as spam

  - by Caleb Gray

  Users on my server have been receiving spam, consistently, for some time now. I have most of spamassassin's plugins enabled, and I have made sure to enable verbose logging, where I can see that all of the plugins are working. Why is it, then, that my users are able to receive the same exact junk mail several times in a day without the message being flagged in some way? Here are the relevant headers of an email that I personally have received several copies of: X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on sub.domain.tld X-Spam-Level: *** X-Spam-Status: No, score=3.0 required=4.0 tests=BAYES_50,FSL_HELO_NON_FQDN_1, HELO_NO_DOMAIN,HTML_MESSAGE,RCVD_IN_BRBL_LASTEXT,RDNS_NONE autolearn=no version=3.3.1 Have I accidentally missed the plugin that can see that I, and others, have received the same message multiple times in a short period of time?

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• How much traffic is high-traffic [closed]

  - by Jack

  My primary interest is in gathering information about the technology used behind public facing websites. Much of the information I read arbitrarily differentiates between high-traffic vs the unstated non-high-traffic websites. This troubles me because I don't have a good grasp of how much traffic is high-traffic. Can anyone help me with this, is there a good rule of thumb? Please don't tell me it depends ;)

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• High fan speed with no reason

  - by Klaus

  For a few weeks, the fans of my Lenovo B590 laptop, running on Xubuntu 14, turn to high speed a few minutes after it is turned on. The fans won't speed down until I turn the computer off. This is quite strange, since This didn't happen before The temperatures are quite low (are they ?) $sensors Adapter: Virtual device temp1: +36.0°C (crit = +88.0°C) temp2: +30.0°C (crit = +126.0°C) coretemp-isa-0000 Adapter: ISA adapter Physical id 0: +37.0°C (high = +72.0°C, crit = +90.0°C) Core 0: +34.0°C (high = +72.0°C, crit = +90.0°C) Core 1: +31.0°C (high = +72.0°C, crit = +90.0°C) thinkpad-isa-0000 Adapter: ISA adapter fan1: 0 RPM pkg-temp-0-virtual-0 Adapter: Virtual device temp1: +37.0°C $sudo hddtemp /dev/sda /dev/sda: ST500LT012-9WS142: 33°C The computer is under low load: top - 08:30:15 up 16 min, 2 users, load average: 0.28, 0.23, 0.23 Tasks: 197 total, 1 running, 196 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.8 us, 0.5 sy, 0.0 ni, 98.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem: 3607944 total, 1973956 used, 1633988 free, 99660 buffers KiB Swap: 3744764 total, 0 used, 3744764 free. 789936 cached Mem The BIOS is up to date (and there are no fan settings in it) The fan is clean and dust-free Why would the BIOS turn the fans to high speed where there seem to be no reason for that ? It seems that we cannot control the fan manually with this model, so I guess the only solution is to understand why this happens.

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• Teaching high school kids ASP.NET programming

  - by dotneteer

  During the 2011 Microsoft MVP Global Summit, I have been talking to people about teaching kids ASP.NET programming. I want to work with volunteer organizations to provide kids volunteer opportunities while learning technical skills that can be applied elsewhere. The goal is to teach motivated kids enough skill to be productive with no more than 6 hours of instruction. Based on my prior teaching experience of college extension courses and involvement with high school math and science competitions, I think this is quite doable with classic ASP but a challenge with ASP.NET. I don’t want to use ASP because it does not provide a good path into the future. After some considerations, I think this is possible with ASP.NET and here are my thoughts: · Create a framework within ASP.NET for kids programming. · Use existing editor. No extra compiler and intelligence work needed. · Using a subset of C# like a scripting language. Teaches data type, expression, statements, if/for/while/switch blocks and functions. Use existing classes but no class creation and OOP. · Linear rendering model. No complicated life cycle. · Bare-metal html with some MVC style helpers for widget creation; ASP.NET control is optional. I want to teach kids to understand something and avoid black boxes as much as possible. · Use SQL for CRUD with a helper class. Again, I want to teach understanding rather than black boxes. · Provide a template to encourage clean separation of concern. · Provide a conversion utility to convert the code that uses template to ASP.NET MVC. This will allow kids with AP Computer Science knowledge to step up to ASP.NET MVC. Let me know if you have thoughts or can help.

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• Extract High Quality Icons from Files Using a Free Tool

  - by Lori Kaufman

  If you need to extract an icon from a program file or other type of file (such as .dll files), there are many free tools available that make the task easy. However, very few will extract high quality icon images from the files. Most free icon extraction tools will extract smaller icon image sizes, such as 16×16, 32×32, or 48×48 pixels. Some icons come in larger sizes, such as icons used in Windows. There is a free, small utility, called BeCyIconGrabber, that allows you to view and save icons and cursors of any size contained in .exe, .dll, .icl, .ocx, .cpl, .src, .ico, and .cur files. You can save the extracted icons individually as a .png file, .bmp file, .ico file, or .cur file, or in groups within resource libraries, i.e., .dll or .icl files. BeCyIconGrabber can be downloaded as an installable file or as a portable executable that does not need to be installed. We downloaded the portable file. How To Properly Scan a Photograph (And Get An Even Better Image) The HTG Guide to Hiding Your Data in a TrueCrypt Hidden Volume Make Your Own Windows 8 Start Button with Zero Memory Usage

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• XNA Easy Storage XBOX 360 High Scores

  - by user1003211

  To followup from a previous query - I need some help with the implementation of easystorage high scores, which is bringing up some errors on the xbox. I get the prompt screen, a savedevice is selected and a file are all created! However the file remains empty, (I've tried prepopulating but still get errors). The full portions of the scoring code can be found here: http://pastebin.com/74v897Yt The current issue in particular is in LoadHighScores() - "There is an error in XML document (0, 0)." under line data = (HighScoreData)serializer.Deserialize(stream); I'm not sure whether this line is correct either: HighScoreData data = new HighScoreData(); public static HighScoreData LoadHighScores(string container, string filename) { HighScoreData data = new HighScoreData(); if (Global.SaveDevice.FileExists(container, filename)) { Global.SaveDevice.Load(container, filename, stream => { File.Open(Global.fileName_options, FileMode.OpenOrCreate, FileAccess.Read); try { // Read the data from the file XmlSerializer serializer = new XmlSerializer(typeof(HighScoreData)); data = (HighScoreData)serializer.Deserialize(stream); } finally { // Close the file stream.Close(); // stream.Dispose(); } }); } return (data); } I call: PromptMe(); when the Start button is pressed at the beginning. I call: if (Global.SaveDevice.IsReady){entries = LoadHighScores(HighScoresContainer, HighScoresFilename);} during the menu screen to try and display the highscore screen. I call: SaveHighScore(); when game ends. I've tried altering the struct code to a class but still no luck. Any help greatly appreciated.

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• High-Level Application Architecture Question

  - by Jesse Bunch

  So I'm really wanting to improve how I architect the software I code. I want to focus on maintainability and clean code. As you might guess, I've been reading a lot of resources on this topic and all it's doing is making it harder for me to settle on an architecture because I can never tell if my design is the one that the more experienced programmer would've chosen. So I have these requirements: I should connect to one vendor and download form submissions from their API. We'll call them the CompanyA. I should then map those submissions to a schema fit for submitting to another vendor for integration with the email service provider. We'll call them the CompanyB. I should then submit those responses to the ESP (CompanyB) and then instruct the ESP to send that submitter an email. So basically, I'm copying data from one web service to another and then performing an action at the latter web service. I've identified a couple high-level services: The service that downloads data from CompanyA. I called this the CompanyAIntegrator. The service that submits the data to CompanyB. I called this CompanyBIntegrator. So my questions are these: Is this a good design? I've tried to separate the concerns and am planning to use the facade pattern to make the integrators interchangeable if the vendors change in the future. Are my naming conventions accurate and meaningful to you (who knows nothing specific of the project)? Now that I have these services, where should I do the work of taking output from the CompanyAIntegrator and getting it in the format for input to the CompanyBIntegrator? Is this OK to be done in main()? Do you have any general pointers on how you'd code something like this? I imagine this scenario is common to us engineers---especially those working in agencies. Thanks for any help you can give. Learning how to architect well is really mind-cluttering.

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• check what process was causing the problem of high cpu load

  - by linuxk

  I'm running nginx wordpress server in KVM using 12.04 server x86. It was running very well about 4 month until 2 hours ago. I found that my website is down and no ping response. Virt-manager logged high cpu load(plz see the picture below) before unexpected shut down. I want to know what process caused unexpected shutdown. The following log files make me think my server is attacked. Any suggestions and help would be appreciated. kern.log and syslog showed me same output. Nov 11 03:54:11 www kernel: [1344541.156239] [UFW BLOCK] IN=eth0 OUT= MAC= SRC=0.0.0.0 DST=224.0. 0.1 LEN=32 TOS=0x00 PREC=0xC0 TTL=1 ID=0 DF PROTO=2 Nov 11 03:54:11 www kernel: [1344541.156315] [UFW BLOCK] IN=eth0 OUT= MAC= SRC=0101:080a:2334:c90 0:0100:0000:0000:0000 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=72 TC=0 HOPLIMIT=1 FLOWLBL=0 PROTO=ICMPv6 TYPE=130 CODE=0 /nginx/access.log showed me 119.235.237.17 - - [11/Nov/2012:03:45:29 +0900] "GET /blog HTTP/1.1" 200 30493 "-" "Yeti/1.0 (NHN Corp.; http://help.naver.com/robots/)" my-server-ip - - [11/Nov/2012:11:05:30 +0900] "POST /wp-cron.php?doing_wp_cron=13 HTTP/1.0" 499 0 "-" "WordPress/3.4.2; http://mywebsite.com" Server turned on in here. 119.235.237.16 - - [11/Nov/2012:11:05:30 +0900] "GET /blog HTTP/1.1" 200 32935 "-" "Yeti/1.0 (NHN Corp.; http://help.naver.com/robots/)"

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• Integration error in high velocity

  - by Elektito

  I've implemented a simple simulation of two planets (simple 2D disks really) in which the only force is gravity and there is also collision detection/response (collisions are completely elastic). I can launch one planet into orbit of the other just fine. The collision detection code though does not work so well. I noticed that when one planet hits the other in a free fall it speeds backward and goes much higher than its original position. Some poking around convinced me that the simplistic Euler integration is causing the error. Consider this case. One object has a mass of 1kg and the other has a mass equal to earth. Say the object is 10 meters above ground. Assume that our dt (delta t) is 1 second. The object goes to the height of 9 meters at the end of the first iteration, 7 at the end of the second, 4 at the end of the third and 0 at the end of the fourth iteration. At this points it hits the ground and bounces back with the speed of 10 meters per second. The problem is with dt=1, on the first iteration it bounces back to a height of 10. It takes several more steps to make the object change its course. So my question is, what integration method can I use which fixes this problem. Should I split dt to smaller pieces when velocity is high? Or should I use another method altogether? What method do you suggest? EDIT: You can see the source code here at github:https://github.com/elektito/diskworld/

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