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• FeiTeng 1000

  - by nospam(at)example.com (Joerg Moellenkamp)

  My colleague Roland pointed me to a website with some additional information about the usage of SPARC in the Tianhe-1a super computer: 512 飞腾 Server( 4 socket Galaxy FT1000 飞腾 cpu ( 65nm, 1Ghz, 8 core, 8 threads, openSPARC T2) that has 3HT links and 4 DDR3 memory channel and 8 PCI2.0)So essentialy the NUDT took the openSPARC T2 and added DDR3 , PCIe 2.0 and Hypertransport to it ...

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• Are there any concerns with using a static read-only unit of work so that it behaves like a cache?

  - by Rowan Freeman

  Related question: How do I cache data that rarely changes? I'm making an ASP.NET MVC4 application. On every request the security details about the user will need to be checked with the area/controller/action that they are accessing to see if they are allowed to view it. The security information is stored in the database. For example: User Permission UserPermission Action ActionPermission A "Permission" is a token that is applied to an MVC action to indicate that the token is required in order to access the action. Once a user is given the permission (via the UserPermission table) then they have the token and can therefore access the action. I've been looking in to how to cache this data (since it rarely changes) so that I'm only querying in-memory data and not hitting a database (which is a considerable performance hit at the moment). I've tried storing things in lists, using a caching provider but I either run in to problems or performance doesn't improve. One problem that I constantly run in to is that I'm using lazy loading and dynamic proxies with EntityFramework. This means that even if I ToList() everything and store them somewhere static, the relationships are never populated. For example, User.Permissions is an ICollection but it's always null. I don't want to Include() everything because I'm trying to keep things simple and generic (and easy to modify). One thing I know is that an EntityFramework DbContext is a unit of work that acts with 1st-level caching. That is, for the duration of the unit of work, everything that is accessed is cached in memory. I want to create a read-only DbContext that will exist indefinitely and will only be used to read about permission data. Upon testing this it worked perfectly; my page load times went from 200ms+ to 20ms. I can easily force the data to refresh at certain intervals or simply leave it to refresh when the application pool is recycled. Basically it will behave like a cache. Note that the rest of the application will interact with other contexts that exist per request as normal. Is there any disadvantage to this approach? Could I be doing something different?

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• Java heap space

  - by java_mouse

  In Java/JVM, why do we call the memory place where Java creates objects as "Heap"? Does it use the Heap Data Structure to create/remove/maintain the objects? As I read in the documentation of Heap data structure, the algorithm compares the objects with existing nodes and places them in such a way that Parent object is "greater" than the children. ( Or "lesser" in case of min heap). So in JVM, how are the objects compared against each other before placing them in the heap?

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• Friday Fun: Let The Bullets Fly 2

  - by Asian Angel

  Friday is finally here again, so take a few minutes to relax and have some fun! In this week’s game you are a pistol carrying sharp-shooter with a mission to eliminate the legion of evil henchmen scattered across different locations. Do you have the skill and patience needed to defeat them? 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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• Advisor Webcasts in July for the EBS Technology area

  - by Oracle_EBS

  For July 2012 we have scheduled 2 Webcasts: The first one is an E-Business Suite OAM Overview and Usage session. The second is about the E-Business Suite Workflow Avisor as a follow-up session. As every time we are driving 2 sessions for a better global alignment : E-Business Suite - OAM Overview and Monitoring Agenda Oracle Applications Manager (OAM) Overview Log files Diagnostics and Logging Concurrent processing through OAM Applications Dashboard Troubleshooting Patch Management. Patch Wizard OAM "How To" Documents Questions &Answers EMEA Session : July 10, 2012 at 09:00 AM UK / 10:00 AM CET / 13:30 India / 17:00 Japan / 18:00 Australia Details & Registration : Note 1466056.1 Direct link to register in WebEx US Session : July 11, 2012 at 18:00 UK / 19:00 CET / 10:00 AM Pacific / 11:00 AM Mountain/ 01:00 PM Eastern Details & Registration : Note 1466057.1 Direct link to register in WebEx E-Business Suite - Workflow Analyzer - Follow-Up Agenda Overview of Workflow Analyzer Enhancements implemented in the latest Release Questions & Answers EMEA Session : July 24, 2012 at 09:00 AM UK / 10:00 AM CET / 13:30 India / 17:00 Japan / 18:00 Australia Details & Registration : Note 1466058.1 Direct link to register in WebEx US Session : July 25, 2012 at 18:00 UK / 19:00 CET / 10:00 AM Pacific / 11:00 AM Mountain/ 01:00 PM Eastern Details & Registration : Note 1466059.1 Direct link to register in WebEx Schedules, recordings and the Presentations of the Advisor Webcast drove under the EBS Applications Technology area can be found in Note 1186338.1. Current Schedules of Advisor Webcast for all Oracle Products can be found on Note 740966.1 Post Presentation Recordings of the Advisor Webcasts for all Oracle Products can be found on Note 740964.1

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• Change Envelope From to match From header in Postfix

  - by lid

  I am using Postfix as a gateway for my domain and need it to change or rewrite the Envelope From address to match the From header. For example, the From: header is "[email protected]" and the Envelope From is "[email protected]". I want Postfix to make the Envelope From "[email protected]" before relaying it on. I took a look at the Postfix Address Rewriting document but couldn't find anything that matched my use case. (In case you're curious why I need to do this: Gmail uses the same Envelope From when sending from a particular account, no matter which From: address you choose to use. I would prefer not to disclose the account being used to send the email. Also, it messes with SPF/DMARC domain alignment - see 4.2.2 of the DMARC draft spec.)

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• Pragmas and exceptions

  - by Darryl Gove

  The compiler pragmas: #pragma no_side_effect(routinename) #pragma does_not_write_global_data(routinename) #pragma does_not_read_global_data(routinename) are used to tell the compiler more about the routine being called, and enable it to do a better job of optimising around the routine. If a routine does not read global data, then global data does not need to be stored to memory before the call to the routine. If the routine does not write global data, then global data does not need to be reloaded after the call. The no side effect directive indicates that the routine does no I/O, does not read or write global data, and the result only depends on the input. However, these pragmas should not be used on routines that throw exceptions. The following example indicates the problem: #include <iostream extern "C" { int exceptional(int); #pragma no_side_effect(exceptional) } int exceptional(int a) { if (a==7) { throw 7; } else { return a+1; } } int a; int c=0; class myclass { public: int routine(); }; int myclass::routine() { for(a=0; a<1000; a++) { c=exceptional(c); } return 0; } int main() { myclass f; try { f.routine(); } catch(...) { std::cout << "Something happened" << a << c << std::endl; } } The routine "exceptional" is declared as having no side effects, however it can throw an exception. The no side effects directive enables the compiler to avoid storing global data back to memory, and retrieving it after the function call, so the loop containing the call to exceptional is quite tight: $ CC -O -S test.cpp ... .L77000061: /* 0x0014 38 */ call exceptional ! params = %o0 ! Result = %o0 /* 0x0018 36 */ add %i1,1,%i1 /* 0x001c */ cmp %i1,999 /* 0x0020 */ ble,pt %icc,.L77000061 /* 0x0024 */ nop However, when the program is run the result is incorrect: $ CC -O t.cpp $ ./a.out Something happend00 If the code had worked correctly, the output would have been "Something happened77" - the exception occurs on the seventh iteration. Yet, the current code produces a message that uses the original values for the variables 'a' and 'c'. The problem is that the exception handler reads global data, and due to the no side effects directive the compiler has not updated the global data before the function call. So these pragmas should not be used on routines that have the potential to throw exceptions.

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• Procedurally generated 2d terrain for side scroller on Sega Genesis hardware?

  - by DJCouchyCouch

  I'm working on the Sega Genesis that has a 8mhz Motorola 68000 CPU. Any ideas on how to generate fast and decent 2d tile terrain for a side scroller in real time? The game would generate new columns or rows depending on the direction the player is scrolling in. The generation would have to be deterministic. The same seed value would generate the same terrain. I'm looking for algorithms that would satisfy the memory and CPU constraints of the hardware.

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• Pointers in C vs No pointers in PHP

  - by AnnaBanana

  Both languages have the same syntax. Why does C have the weird * character that denotes pointers (which is some kind of memory address of the variable contents?), when PHP doesn't have it and you can do pretty much the same things in PHP that you can do in C, without pointers? I guess the PHP compiler handles this internally, why doesn't C do the same? Doesn't this add unneeded complexity in C? For example I don't understand them :)

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• How to refactor my design, if it seems to require multiple inheritance?

  - by Omega

  Recently I made a question about Java classes implementing methods from two sources (kinda like multiple inheritance). However, it was pointed out that this sort of need may be a sign of a design flaw. Hence, it is probably better to address my current design rather than trying to simulate multiple inheritance. Before tackling the actual problem, some background info about a particular mechanic in this framework: It is a simple game development framework. Several components allocate some memory (like pixel data), and it is necessary to get rid of it as soon as you don't need it. Sprites are an example of this. Anyway, I decided to implement something ala Manual-Reference-Counting from Objective-C. Certain classes, like Sprites, contain an internal counter, which is increased when you call retain(), and decreased on release(). Thus the Resource abstract class was created. Any subclass of this will obtain the retain() and release() implementations for free. When its count hits 0 (nobody is using this class), it will call the destroy() method. The subclass needs only to implement destroy(). This is because I don't want to rely on the Garbage Collector to get rid of unused pixel data. Game objects are all subclasses of the Node class - which is the main construction block, as it provides info such as position, size, rotation, etc. See, two classes are used often in my game. Sprites and Labels. Ah... but wait. Sprites contain pixel data, remember? And as such, they need to extend Resource. But this, of course, can't be done. Sprites ARE nodes, hence they must subclass Node. But heck, they are resources too. Why not making Resource an interface? Because I'd have to re-implement retain() and release(). I am avoiding this in virtue of not writing the same code over and over (remember that there are multiple classes that need this memory-management system). Why not composition? Because I'd still have to implement methods in Sprite (and similar classes) that essentially call the methods of Resource. I'd still be writing the same code over and over! What is your advice in this situation, then?

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• Developing a Streaming Pipeline Component for BizTalk Server

  - by Rajesh Charagandla

  This paper shows how to address issues with high memory consumption and latency by taking a streaming approach to pipeline component development. Download Link: http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=bb88dafd-9bba-4d6b-b276-cd7e205f8896

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• Harnessing Business Events for Predictive Decision Making - part 1 / 3

  - by Sanjeev Sharma

  Businesses have long relied on data mining to elicit patterns and forecast future demand and supply trends. Improvements in computing hardware, specifically storage and compute capacity, have significantly enhanced the ability to store and analyze mountains of data in ever shrinking time-frames. Nevertheless, the reality is that data growth is outpacing storage capacity by a factor of two and computing power is still very much bounded by Moore's Law, doubling only every 18 months.Faced with this data explosion, businesses are exploring means to develop human brain-like capabilities in their decision systems (including BI and Analytics) to make sense of the data storm, in other words business events, in real-time and respond pro-actively rather than re-actively. It is more like having a little bit of the right information just a little bit before hand than having all of the right information after the fact. To appreciate this thought better let's first understand the workings of the human brain.Neuroscience research has revealed that the human brain is predictive in nature and that talent is nothing more than exceptional predictive ability. The cerebral-cortex, part of the human brain responsible for cognition, thought, language etc., comprises of five layers. The lowest layer in the hierarchy is responsible for sensory perception i.e. discrete, detail-oriented tasks whereas each of the above layers increasingly focused on assembling higher-order conceptual models. Information flows both up and down the layered memory hierarchy. This allows the conceptual mental-models to be refined over-time through experience and repetition. Secondly, and more importantly, the top-layers are able to prime the lower layers to anticipate certain events based on the existing mental-models thereby giving the brain a predictive ability. In a way the human brain develops a "memory of the future", some sort of an anticipatory thinking which let's it predict based on occurrence of events in real-time. A higher order of predictive ability stems from being able to recognize the lack of certain events. For instance, it is one thing to recognize the beats in a music track and another to detect beats that were missed, which involves a higher order predictive ability.Existing decision systems analyze historical data to identify patterns and use statistical forecasting techniques to drive planning. They are similar to the human-brain in that they employ business rules very much like mental-models to chunk and classify information. However unlike the human brain existing decision systems are unable to evolve these rules automatically (AI still best suited for highly specific tasks) and  predict the future based on real-time business events. Mistake me not,  existing decision systems remain vital to driving long-term and broader business planning. For instance, a telco will still rely on BI and Analytics software to plan promotions and optimize inventory but tap into business events enabled predictive insight to identify specifically which customers are likely to churn and engage with them pro-actively. In the next post, i will depict the technology components that enable businesses to harness real-time events and drive predictive decision making.

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• CentOS 6 - YUM Local Repo - Ensure consistent package distribution

  - by Mike Purcell

  I've read a few guides outlining how to setup a local YUM repo, but none of them explicitly stated an answer to my question; If I set up a local YUM repo, does that mean that any CentOS servers which pull from said repo will never be "ahead" of the local YUM repo? I want to ensure a consistent package distribution across all my servers. Right now, when I do a yum update, even on a daily basis, the servers can be out of alignment. For example if I run YUM update on my dev server in the morning, then run YUM update on one of my production servers in the afternoon, the production server may have picked up a new version of a package that the dev server did not pick up, due to the time window between the update commands. Rather, I'd prefer that I run yum update from my dev server which has access to remote upstream yum repos, then let it sit for 2 weeks, after which I run yum update on my production servers against the local repo on my dev server.

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• How can I prevent my laptop to freeze when I connect my external display?

  - by user170230

  I'm facing a problem with connecting a display on my laptop (a Toshiba mini NB 200), running Ubuntu 13.04. Processor: Intel® Atom™ CPU N270 @ 1.60GHz × 2 Memory: 993,6 MiB Graphics: Intel® 945GME x86/MMX/SSE2 OS type: 32-bit Disk: 156,3 GB After having connected my display with my laptop the first five minutes all runs perfect, however after that my laptop do not respond any more and I don't know what to do. When I disconnect the HDMI cable the screen just goes all black.

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• Lazy Initailization in .NET 4.0

  Lazy initialization or lazy instantiation means that an object is not created until it is first referenced. Lazy initialization is used to reduce wasteful computation, memory requirements. Following is an example where Lazy initialization is particularly useful.

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• My Laptop Beeps when I try to USB boot install

  - by Gino

  I tried to boot install Ubuntu using my laptop (without CD Drive) using a USB drive, then it goes to the boot selection menu (the one with the Ubuntu logo installation options). I selected Install then my laptop just beeps - 1 short beep, after that it stops then nothing installs, it just stays at the installation menu, can someone please help? Laptop Specs Neo Notebook (forgot the model version) 2GB RAM running Win XP SP3 150GB Hard Drive memory Would really appreciate if someone helped, I just used the normal 12.04 installer.

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• How do I install lubuntu? (kernel panic)

  - by melvincv

  Please help me install Lubuntu 12.04 i386 on an old computer. I select the "Try Lubuntu without installing" and it crashes with a kernel panic. Rarely I do get to the live OS, but soon the display goes blank. The messages log gives me '[drm] ERROR GPU hung/wedged' The specs are: Pentium 4 2.4GHz 1GB DDR RAM 40GB PATA HDD Intel 845GL chipset (8MB framebuffer, 64MB shared system memory set in the BIOS)

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• Wait, Chrome Dev Tools could do THAT?

  Wait, Chrome Dev Tools could do THAT? Your browser is one of the most and best instrumented development platforms -- you may just not realize it yet. In this episode we'll take a whirlwind tour of how to analyze network performance, rendering and layout pipeline, as well as detecting memory leaks in your Javascript code, and using audits and extensions to build faster and better apps! From: GoogleDevelopers Views: 207 16 ratings Time: 33:40 More in Science & Technology

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• Working with Spatial Data Part II - Plotting Shapes and Storing Geocoded Data

  Continuing from Part I of the Spatial Data series we model an in-memory/persistent data repository for storing geocoded data and plot the data.

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• "No root file system is defined"

  - by user169670

  Have recently installed Ubuntu 12.04.2 LTS by USB on my newly built custom pc and I have run into a problem during installation with the error saying "No root file system is defined." My pc speculations: AMD Phenom x4 955 Black Edition ASRock 960GM/U3S3 FX Micro ATX AM3+ Motherboard Mushkin Redline 8GB (2x4GB) DDR3-1866 Memory Seagate Barracuda 1.5TB 3.5" 7200RPM Internal Hard Drive XFX Radeon HD 7850 1GB Video Card XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply Everything is new.

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• How can I increase my disk space when Ubuntu is installed alongside with Windows?

  - by Matthew

  Some time ago i reinstalled windows, formating and deleting every partition. I then made 3 partitions: One only for Windows OS (about 25GB) One for Ubuntu OS (about 25GB, if i remember corectly 10GB for swap memory and 15GB as an ext4 partition) (not sure if it was that, hope I am not wrong) and like 200GB for all the other stuff. Recently I got a message that i am running out of disk space. My question is: is there a way to resize the 200GB partition and add more space for the Ubuntu partition?

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• Ginormous...the new Oracle T5-8 SPARC SuperCluster!

  - by user12608550

  Ginormous...no other way to describe it...the new Oracle T5-8 SPARC SuperCluster...2000+ fast CPU threads, massive memory (DRAM & Flash), 1.2 M IOPS, HUGE storage and bandwidth...WOW! Wanna build a SPARC Cloud? This is it! Multiple virtualization technologies (VM Server for SPARC, and Solaris zones) for elasticity and resource pooling along with Oracle Enterprise Manager Ops Center 12c providing full cloud management capability. Check it out!: ORACLE SUPERCLUSTER T5-8 Overview and Frequently Asked Questions Oracle SuperCluster T5-8 Oracle T5-8 SuperCluster E-Book

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• The Pipeline Limiter in SQL Server Integration Services (Video)

  Not many people understand that the Integration Services pipeline can be intentionally throttled back under the covers to stop you from running out of memory.  In this video we show you how to detect this is happening and explain more about the limiter itself.

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• ScaleOut StateServer Product Review

  EggHeadCafe has a free drawing for a license to ScaleOut StateServer. You will want want to enter your name in for this one! Learn how to share objects from their in memory object store across windows forms, wcf, asp.net, and windows services.  read moreBy Robbe MorrisDid 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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• Certify May Updates

  - by Sadia2

  We have added some release and platform certifications to MOS Certify Database: Oracle Database 10.2.0.5.0, Oracle Fail Safe Server 4.1.0 Fusion Middleware: Oracle Tuxedo 10.3.0.0.0, Oracle Business Intelligence Applications 11.1.1.7.1 E-Business Suite: Oracle E-Business Suite 12.1.2 JD Edwards EnterpriseOne: JD Edwards EnterpriseOne Database Server for In-Memory Applications X9.1.3.0, JD Edwards EnterpriseOne Business Services Server 9.1.3.0 JD Edwards World: JD Edwards World Base product A9.3-Single Byte  

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