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• How to get average network load instead of instant

  - by Adam Ryczkowski

  Welcome, I use conky to see network load statistics with sampling every 8 seconds in order to get somewhat more smooth history chart. Unfortunately, all values i get are not average for this 8 second period, but they are sampled from much smaller time span, so charts are the same choppy, as if they were sampled from 1 second or less. Is there any way to get conky (or at least System Monitor) display system properties averaged over specified amount of time, just like Windows' task manager does? I would like to have conky display hard drive usage from iostat, but there will be little use if it, if conky reports instant values not averaged over time.

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• Run Blustacks or Android to play clash of clans on ubuntu 13.4+

  - by Joe Hanus

  I am trying to get rid of the need to dual boot Ubuntu and windows and one thing I can do with windows I can not do with Linux is to run Bluestacks to play android games my favourite one ow is clash of clans. I have tried different VM's to run android emulators and virtual box but nothing works for clash of clans I can download the game to the VM from Google Play Store but it fails to open If Ubuntu can fix this by making a way to successfully install Bluestacks on Ubuntu or Android with Virtual box with out loading errors of all apps/games it would help the Linux community to become less dependant of Windows. Thanks in advance! go Ubuntu!

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• Is "watermarking" code with random trailing whitespace a good way to detect plagiarism?

  - by paperjam

  Consider this: int f(int x) { return 2 * x * x; } and this int squareAndDouble(int y) { return 2*y*y; } If you found these in independent bodies of code, you might give the two programmers the benefit of the doubt and assume they came up with more-or-less the same function independently. But look at the whitespace at the end of each line of code. Same pattern in both. Surely evidence of copying. On a larger piece of code, correlation of random whitespace at line ends would be irrefutable evidence of a shared origin. Now aside from the obvious weaknesses: e.g. visible or obvious in some editors, easily removed, I was wondering if it was worth deploying something like this in my open source project. My industry has a history of companies ripping off open source projects.

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• Why didn't IE8 support border-radius, evil or ignorance?

  - by Mark Rogers

  When I think back to the time of the release of IE7, I was surprised that there wasn't border-radius support. It seems like an obviously great idea to have a css-property name for rounded corners, which can potentially make a site look less like it came from the computer stone-age. Finally, today we have IE9 and Microsoft finally decided to play ball with the rest of the world. But the question remains, why didn't Microsoft bother to support border-radius in IE8? The problem probably became obvious to the company as the growing chorus of complaints from web developers got louder after the release of IE7. Was the company so isolated or in group-think mode that they were blind for that many years? Or did Microsoft have some additional motive to suppress the border-radius property?

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• Life, Identity, and Everything

  Life, Identity, and Everything Tim Bray is the Developer Advocate, and Breno de Madeiros is the tech lead, in the group at Google that does authentication and authorization APIs; specifically, those involving OAuth and OpenID. Breno also has his name on the front of a few of the OAuth RFCs. We're going to talk for a VERY few (less than 10) minutes on why OAuth is a good idea, and a couple of things we're working on right now to help do away with passwords. After that, ask us anything. From: GoogleDevelopers Views: 0 0 ratings Time: 30:00 More in Science & Technology

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• New insights I can learn from the Groovy language

  - by Andrea

  I realize that, for a programmer coming from the Java world, Groovy contains a lot of new ideas and cool tricks. My situation is different, as I am learning Groovy coming from a dynamic background, mainly Python and Javascript. When learning a new language, I find that it helps me if I know beforehand which features are more or less old acquaintances under a new syntax and which ones are really new, so that I can concentrate on the latter. So I would like to know which traits distinguish Groovy among the dynamic languages. What are the ideas and insights that a programmer well-versed in dynamic languages should pay attention to when learning Groovy?

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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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• Force Your Mac to Sort Folders on Top of Files (Windows Style)

  - by Eric Z Goodnight

  Even die-hard Mac converts have their issues with Mac OS, and one of those problems is that OS X lists folders mixed in with all other files. Here’s how to fix that in under five minutes with a clever hack. You know you’ve had that issue. You’ve dug through your files looking for that one elusive folder, and because it’s jumbled in with all the other stuff, it’s more or less impossible to find. Have no fear, with no downloads or silly plug-in software, you can finally make Mac OS behave like Windows and Linux and list those folders in the proper order.  How To Encrypt Your Cloud-Based Drive with BoxcryptorHTG Explains: Photography with Film-Based CamerasHow to Clean Your Dirty Smartphone (Without Breaking Something)

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• How is Sencha Touch performing on Android in practice ?

  - by Vidar Vestnes

  Hi I'm just about to start a project using Sencha Touch, and just done some minor testing on my HTC desire device. All tutorial videos at Vimeo seems to be using an iPhone emulator running on a Mac. Im not sure how fast this emulator is compared to a real iPhone device or even an real Android device, but from what i have experienced, it seems that my HTC desire is not performing that nicly as this emulator. All animations (sliding, fading, etc) seems abit laggy. You can easily notice that the FPS is much less than on the Vimeo videos. HTC desire is a relativly new and modern Android 2.2 phone, running with decent hardware, so im wondering if Sencha Touch is "ready" for the Android platform. Anybody with practical experience with Android and Sencha Touch ?

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• Dev Lop

  - by Jason Franks

  Back in the early 90s, before I was a professional geek--much less a geek with a blog--I saw this old chop socky movie. I don't remember what it was called, or who was in it... all I remember is that, in one scene, the venerable sensei tells the hero: "You must develop your nunchaku technique." This became a bit fo a catchphrase amongst my high school mates. Well folks, I am developing my technuique. This blog has been renamed and the old posts removed--I could go into my reasons for this, but that would defeat the point of the exercise. Sorry if you liked 'em. It has been a good couple of years since I wrote anything here, so I doubt that I am putting out any regular readers. Will I be posting here more often, now that I've renamed and rethemed the place? I don't know. In the meantime, check it out: Bruce Lee playign ping pong with nunchaku. --JF

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• How to stop getting too focused on a train of thought when programming?

  - by LDM91

  I often find myself getting too focused on a train of thought when programming, which results in me having what I guess could be described as "tunnel vision". As a result of this I miss important details/clues, which means I waste a fair amount of time before finally deciding the path I'm taking to solve the task is wrong. Afterwards, I take a step back which almost always results in me discovering what I've missed in a lot less time.. It's becoming really frustrating as it feels like I'm wasting a lot of time and effort, so I was wondering if anyone else had experienced similar issues, and had some suggestions to stop going down dead ends and programming "blindly" as it were!

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• Hello NHibernate! Quickstart with NHibernate (Part 1)

  - by BobPalmer

  When I first learned NHibernate, I could best describe the experience as less of a learning curve and more like a learning cliff.  A large part of that was the availability of tutorials.  In this first of a series of articles, I will be taking a crack at providing people new to NHibernate the information they need to quickly ramp up with NHibernate. For the first article, I've decided to address the gap of just giving folks enough code to get started.  No UI, no fluff - just enough to connect to a database and do some basic CRUD operations.  In future articles, I will discuss a repository pattern for NHibernate, parent-child relationships, and other more advanced topics. You can find the entire article via this Google Docs link: http://docs.google.com/Doc?docid=0AUP-rKyyUMKhZGczejdxeHZfOGMydHNqdGc0&hl=en Enjoy! -Bob

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• Should functions of a C library always expect a string's length?

  - by Benjamin Kloster

  I'm currently working on a library written in C. Many functions of this library expect a string as char* or const char* in their arguments. I started out with those functions always expecting the string's length as a size_t so that null-termination wasn't required. However, when writing tests, this resulted in frequent use of strlen(), like so: const char* string = "Ugh, strlen is tedious"; libFunction(string, strlen(string)); Trusting the user to pass properly terminated strings would lead to less safe, but more concise and (in my opinion) readable code: libFunction("I hope there's a null-terminator there!"); So, what's the sensible practice here? Make the API more complicated to use, but force the user to think of their input, or document the requirement for a null-terminated string and trust the caller?

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• Win a free ticket + hotel for the umbraco Codegarden &lsquo;10

  The Umbraco CodeGarder 10 is less than 2 months away, starting on June 23rd till June 25th, and thanks to the awesome Niels Hartvig, founder of Umbraco, Im giving away an interesting package. The prize The winner will receive a more then 1000 worth prize, consisting in: One ticket for the full 3 days of the umbraco Codegarden conference 4 nights (22nd to 25th of June) in the same hotel where all the cool guys (core team, umbraco MVP, speakers) are staying: Hotel Kong Arthur The rules I...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Modifying RaspberryPi as perfect linux box [on hold]

  - by Jai Hind Rubik's

  I have just bought one Raspberry pi RaspberryPi. I want to load linux kernel there. Actually my plan is to first load kernel ver sion 2.6.* after that one 3.10.* above that and in boot time I want to load 3.10.* (can choose). just after booting, I want to log in there through my windows machine using client like putty or telnet, on telnet I want see following prompt there: login as: root [email protected]'s password: ********** Last login: Thu Aug 21 22:41:07 2014 from 10.78.235.82 [root@debd ~]# [root@debd ~]#ls [root@debd ~]# Documents ... Can any one tell what kind of modification I needed to do for this? I am college student and have less knowledge managing hardware

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• Samsung 700Z broken by Precise install

  - by Eric

  I tried to install Precise from DVD media and got to the point where the Ubuntu logo is on screen indicating the the installer is loading. At that point the screen went dark. After some time I rebooted the machine. To my dismay the machine would no longer start (Powers on but but no bios start up screen, I can hear initial hard drive spin which soon dies). This is a new machine (less than 2 months) and I have had no previous indications of defects before this incident. In other words, I am convinced the Ubuntu install had something to do with the failure of the machine. Has anyone else had this problem with this model machine? Is this known to happen with precise or other versions of Ubuntu?

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• ideas for a personal website [on hold]

  - by user1314836

  I am planning to register a personal domain + hosting space to be less dependant on external companies. I would like to know if you could share some ideas of what I could do with my own domain. I have been thinking in some of them... Use my own e-mail (but Google Apps is no longer free...). Share my photos instead of using Dropbox. Receiving big files or many files through anonymous FTP. Occasional backups? (I don't know if my host would let me know use the hosting for personal storage). Any other ideas or comments on the above?

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• Best sites to find good .NET Developers

  - by Mag20

  I am looking for good sites to post a position for a .NET developer. I already tried: Craig's list got about 10 resumes, but most couldn't answer our technical questions StackOverflow Careers no responses What sites did you have success with finding good developers? UPDATE 1: Wanted to provide some more information: My company is in NJ. We are a small startup. Less then 10 people. Monster, Dice, CareerBuilder all charge like $500 a month per posting. Seems a bit much. Also only Dice is specifically targeting technical positions. With monster and career builder I am a bit worried about having to go through hundreds of resumes that don't apply.

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• Kicked out when logged in?

  - by acidzombie24

  When i log into ubuntu the screen goes black as it were logging in but then i am back in the login screen. I can login as guest (i should disable that). I can login via ssh. The last time i had no issues was when i used it this morning and the only unusual thing i did was shutdown via ssh (i think i wrote shutdown now) which had ubuntu hang after showing the shuting down screen for many seconds (i kind of assumed it shut down properly since the UI froze as well and it usually takes less time). Whats the easiest way to fix this w/o reinstalling? Its a brand new install and so it probably takes me 10mins to recopy/setup everything so i may just do that -edit- using 12.04

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• Which purpose do armor points serve?

  - by Bane

  I have seen a mechanic which I call "armor points" in many games: Quake, Counter Strike, etc. Generally, while the player has these armor points, he takes less damage. However, they act in a similar fashion that health points do: you lose them by taking said damage. Why would you design such a feature? Is this just health 2.0, or am I missing something? To me, armor only makes sense in, for example, RPG games, where it is a constant that determines your resistance. But I don't see why would it need to be reduceable during combat.

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• Performance triage

  - by Dave

  Folks often ask me how to approach a suspected performance issue. My personal strategy is informed by the fact that I work on concurrency issues. (When you have a hammer everything looks like a nail, but I'll try to keep this general). A good starting point is to ask yourself if the observed performance matches your expectations. Expectations might be derived from known system performance limits, prototypes, and other software or environments that are comparable to your particular system-under-test. Some simple comparisons and microbenchmarks can be useful at this stage. It's also useful to write some very simple programs to validate some of the reported or expected system limits. Can that disk controller really tolerate and sustain 500 reads per second? To reduce the number of confounding factors it's better to try to answer that question with a very simple targeted program. And finally, nothing beats having familiarity with the technologies that underlying your particular layer. On the topic of confounding factors, as our technology stacks become deeper and less transparent, we often find our own technology working against us in some unexpected way to choke performance rather than simply running into some fundamental system limit. A good example is the warm-up time needed by just-in-time compilers in Java Virtual Machines. I won't delve too far into that particular hole except to say that it's rare to find good benchmarks and methodology for java code. Another example is power management on x86. Power management is great, but it can take a while for the CPUs to throttle up from low(er) frequencies to full throttle. And while I love "turbo" mode, it makes benchmarking applications with multiple threads a chore as you have to remember to turn it off and then back on otherwise short single-threaded runs may look abnormally fast compared to runs with higher thread counts. In general for performance characterization I disable turbo mode and fix the power governor at "performance" state. Another source of complexity is the scheduler, which I've discussed in prior blog entries. Lets say I have a running application and I want to better understand its behavior and performance. We'll presume it's warmed up, is under load, and is an execution mode representative of what we think the norm would be. It should be in steady-state, if a steady-state mode even exists. On Solaris the very first thing I'll do is take a set of "pstack" samples. Pstack briefly stops the process and walks each of the stacks, reporting symbolic information (if available) for each frame. For Java, pstack has been augmented to understand java frames, and even report inlining. A few pstack samples can provide powerful insight into what's actually going on inside the program. You'll be able to see calling patterns, which threads are blocked on what system calls or synchronization constructs, memory allocation, etc. If your code is CPU-bound then you'll get a good sense where the cycles are being spent. (I should caution that normal C/C++ inlining can diffuse an otherwise "hot" method into other methods. This is a rare instance where pstack sampling might not immediately point to the key problem). At this point you'll need to reconcile what you're seeing with pstack and your mental model of what you think the program should be doing. They're often rather different. And generally if there's a key performance issue, you'll spot it with a moderate number of samples. I'll also use OS-level observability tools to lock for the existence of bottlenecks where threads contend for locks; other situations where threads are blocked; and the distribution of threads over the system. On Solaris some good tools are mpstat and too a lesser degree, vmstat. Try running "mpstat -a 5" in one window while the application program runs concurrently. One key measure is the voluntary context switch rate "vctx" or "csw" which reflects threads descheduling themselves. It's also good to look at the user; system; and idle CPU percentages. This can give a broad but useful understanding if your threads are mostly parked or mostly running. For instance if your program makes heavy use of malloc/free, then it might be the case you're contending on the central malloc lock in the default allocator. In that case you'd see malloc calling lock in the stack traces, observe a high csw/vctx rate as threads block for the malloc lock, and your "usr" time would be less than expected. Solaris dtrace is a wonderful and invaluable performance tool as well, but in a sense you have to frame and articulate a meaningful and specific question to get a useful answer, so I tend not to use it for first-order screening of problems. It's also most effective for OS and software-level performance issues as opposed to HW-level issues. For that reason I recommend mpstat & pstack as my the 1st step in performance triage. If some other OS-level issue is evident then it's good to switch to dtrace to drill more deeply into the problem. Only after I've ruled out OS-level issues do I switch to using hardware performance counters to look for architectural impediments.

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• Window manager not loading when gnome-classic starts

  - by Dave M G

  When I boot up or log into gnome-classic (no effects), windows don't have the frame around them that has the minimize and close buttons and all that. After that, there all sorts of issues - for example, when I open a new window, it's in the very top left corner, obscuring the menu on the gnome panel... just a whole bunch of minor annoyances. I can get things working by by loading the compiz fusion icon and then selecting to reload the window manager. Of course this is less than ideal. How do I get the window manager to load automatically? Update: It seems that I get no window manager whenever I load Compiz, even after logging in. So it looks like the problem is more generally with Compiz's window manager.

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• What Is The Relationship Between Software Architect and Team Member

  - by Steve Peng

  I work for a small company which has less than 100 persons. Several months ago, this company offered me position of SA and I accepted. There are three teams in this company, and I work for one of them. This is the first time I work as a SA. During the past months, I find I don't have any power of management, I even can't let the team member do things (coding-related) in the way which is correct and more efficient. The team members argue with me on very very basic technical questions and I have to explain to them again and again. Though some members did take my advice, other members stubbornly program in their way which frequently proved wrong finally. Recently I feel a little tired and confused. I wonder what is correct relationship between a Software Architect and team members including the team leader? Besides, is software architect also leaded by the Team Leader?

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• How to Switch from 4G LTE to 3G on the New iPad to Save Battery Life

  - by The Geek

  Whether you live somewhere without 4G coverage, you live in a bad coverage zone, or you just want to conserve some battery life, it’s extremely simple to disable 4G / LTE on the new 3rd generation iPad and switch to 3G instead, which uses less battery life. Note: We’ve not done formal testing yet to figure out how much battery life you might save, but there’s no question that 4G LTE technology uses a lot more battery overall, and it’s useful to know that you can disable it. Make Your Own Windows 8 Start Button with Zero Memory Usage Reader Request: How To Repair Blurry Photos HTG Explains: What Can You Find in an Email Header?

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• Are python's cryptographic modules good enough?

  - by Aerovistae

  I mean, say you were writing professional grade software that would involve sensitive client information. (Take this in the context of me being an amateur programmer.) Would you use hlib and hmac? Are they good enough to secure data? Or would you write something fancier by hand? Edit: In context of those libraries containing more or less the best hashing algorithms in the world, I guess it's silly to ask if you'd "write something fancier." What I'm really asking here is whether it's enough on its own.

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