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  • Why isn't there a python compiler to native machine code?

    - by user2986898
    As I understand, the cause of the speed difference between compiled languages and python is, that the first compiles code all way to the native machine's code, whereas python compiles to python bytecode, to be interpreted by the PVM. I see that this way python codes can be used on multiple operation system (at least in most cases), however I do not understand, why is not there an additional (and optional) compiler for python, which compiles the same way as traditional compilers. This would leave to the programmer to chose, which is more important to them; multiplatform executability or performance on native machine. In general; why are not there any languages which could be behave both as compiled and interpreted?

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  • 25. Treffen der FraOSUG am 18. September 2012

    - by uligraef
    Zum 25. Treffen der FraOSUG (Frankfurter Open Solaris / Solaris / Oracle Solaris Users Group) treffen wir uns erstmals in den Räumlichkeiten der Geschäftstelle in Dreieich. Wann? 18. September 2012, 18:00 - 21:00 Uhr Wo? Oracle, Geschäftsstelle Frankfurt, Robert Bosch Str. 5, 63303 Dreieich Agenda: Begrüßung Optimale Datenkompression kleiner Datenmengen mit Suffix Arrays Nachdem neulich Interesse bekundet wurde wird hier der Vortrag vom mrmcd12 wiederholt.(Ulrich Gräf) Roundtable: ZFS Performance -- Die Diskussion zum Vortrag vom letzten Mal (Alle) Diskussion(alle)  Anmeldung bitte mit Doodle . Mehr siehe auf der FraOSUG Homepage.

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  • Understanding #DAX Query Plans for #powerpivot and #tabular

    - by Marco Russo (SQLBI)
    Alberto Ferrari wrote a very interesting white paper about DAX query plans. We published it on a page where we'll gather articles and tools about DAX query plans: http://www.sqlbi.com/topics/query-plans/I reviewed the paper and this is the result of many months of study - we know that we just scratched the surface of this topic, also because we still don't have enough information about internal behavior of many of the operators contained in a query plan. However, by reading the paper you will start reading a query plan and you will understand how it works the optimization found by Chris Webb one month ago to the events-in-progress scenario. The white paper also contains a more optimized query (10 time faster), even if the performance depends on data distribution and the best choice really depends on the data you have. Now you should be curious enough to read the paper until the end, because the more optimized query is the last example in the paper!

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  • Gaming with ATI open-source drivers

    - by user7174
    I have recently bought humble bundle 2 ( http://www.humblebundle.com/ ). Is there a way to run Braid using ATI's open-source drivers? The game always crashes. When do get it to start in windowed mode once i go to the first level it will crash. I am using the lastest version of Braid (ST3C ignored) When I use the proprietary drivers Braid works flawlessly and World of Goo performance is increased. However there is terrible screen tearing with the ATI propritary drivers. So my question is: How do I play Braid if I want to use the proprietary drivers?

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  • Build Your Own Adapter For Cheap Mains Power on Portable Devices

    - by Jason Fitzpatrick
    If you’re looking for a way to build a battery-to-wall-power adapter for one of your portable devices, this tutorial can serve as a template for your DIY adventures. Mike Worth wanted an outlet adapter for his Canon camera, but Canon wanted $75 for it. Not looking to spend that kind of cash on a very simple adapter, he set out to build his own. The build is quite simple, consisting of a transformer with the proper voltage, and a set of dummy battery casings with thumb tacks and washers to serve as the negative and positive leads. Hit up the link below to see the full build. Making a Mains Adapter [via Hack A Day] HTG Explains: What Is RSS and How Can I Benefit From Using It? HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online

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  • USB-live does not save files between sessions

    - by Mads Skjern
    I created a USB-stick with Ubuntu, using the recommended tool "Startup Disk Creator" and the image for Ubuntu 13.10. The very simple interface looks like this: There can't be much to misunderstand in this GUI. I have chosen to create a USB stick with a live version of Ubuntu, which will save files and settings from session to session, on the USB drive, right? Well, it just doesn't save anything. I go in, create a file on Desktop, restart and it's gone. I did the whole procedure three times, i.e. first creating the USB, then testing if I could save. Have I misunderstood something?

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  • Designing an API on top with Java RMI and Rest APIs

    - by user1303881
    I'm working on the backend of a java web application. We have a document repository (Fedora Commons specifically) where we house xml files. I want to abstract the API of the repository internally so that we aren't tightly coupled to one product. I'd also like to give the flexibility of connecting to to a repository via Java RMI or REST APIs. I was hoping to get advice or resources on how to implement something like this. My thought it that I'd have some abstract repository class that had methods like getRecord, updateRecord, and deleteRecord. In the constructor I would pass the URI for the repository and the API method and port. This would allow some flexibility in the future so that if the REST api became more practical, but allow the flexibility or using RMI which could (should?) have better performance. Am I over thinking this or am I on the right path?

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  • Finding files at more speed

    - by Chaitanya
    I have been using find command to find files on my 1 tb hard disk. it takes very long. then I used locate which proved to be faster with regular update using updatedb. But the limitation of locate is that I cannot find files with certain size or modified/created time. can you suggest me any ideas on how to find files at more speed or in that case how to pipe output of locate command in a way that all other information like size, time, etc. can be displayed or redirected to a file.

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  • jqGrid - dynamically load different drop down values for different rows depending on another column value

    - by Renso
    Goal: As we all know the jqGrid examples in the demo and the Wiki always refer to static values for drop down boxes. This of course is a personal preference but in dynamic design these values should be populated from the database/xml file, etc, ideally JSON formatted. Can you do this in jqGrid, yes, but with some custom coding which we will briefly show below (refer to some of my other blog entries for a more detailed discussion on this topic). What you CANNOT do in jqGrid, referrign here up and to version 3.8.x, is to load different drop down values for different rows in the jqGrid. Well, not without some trickery, which is what this discussion is about. Issue: Of course the issue is that jqGrid has been designed for high performance and thus I have no issue with them loading a  reference to a single drop down values list for every column. This way if you have 500 rows or one, each row only refers to a single list for that particuolar column. Nice! SO how easy would it be to simply traverse the grid once loaded on gridComplete or loadComplete and simply load the select tag's options from scratch, via ajax, from memory variable, hard coded etc? Impossible! Since their is no embedded SELECT tag within each cell containing the drop down values (remeber it only has a reference to that list in memory), all you will see when you inspect the cell prior to clicking on it, or even before and on beforeEditCell, is an empty <TD></TD>. When trying to load that list via a click event on that cell will temporarily load the list but jqGrid's last internal callback event will remove it and replace it with the old one, and you are back to square one. Solution: Yes, after spending a few hours on this found a solution to the problem that does not require any updates to jqGrid source code, thank GOD! Before we get into the coding details, the solution here can of course be customized to suite your specific needs, this one loads the entire drop down list that would be needed across all rows once into global variable. I then parse this object that contains all the properties I need to filter the rows depending on which ones I want the user to see based off of another cell value in that row. This only happens when clicking the cell, so no performance penalty. You may of course to load it via ajax when the user clicks the cell, but I found it more effecient to load the entire list as part of jqGrid's normal editoptions: { multiple: false, value: listingStatus } colModel options which again keeps only a reference to the sinlge list, no duplciation. Lets get into the meat and potatoes of it.         var acctId = $('#Id').val();         var data = $.ajax({ url: $('#ajaxGetAllMaterialsTrackingLookupDataUrl').val(), data: { accountId: acctId }, dataType: 'json', async: false, success: function(data, result) { if (!result) alert('Failure to retrieve the Alert related lookup data.'); } }).responseText;         var lookupData = eval('(' + data + ')');         var listingCategory = lookupData.ListingCategory;         var listingStatus = lookupData.ListingStatus;         var catList = '{';         $(lookupData.ListingCategory).each(function() {             catList += this.Id + ':"' + this.Name + '",';         });         catList += '}';         var lastsel;         var ignoreAlert = true;         $(item)         .jqGrid({             url: listURL,             postData: '',             datatype: "local",             colNames: ['Id', 'Name', 'Commission<br />Rep', 'Business<br />Group', 'Order<br />Date', 'Edit', 'TBD', 'Month', 'Year', 'Week', 'Product', 'Product<br />Type', 'Online/<br />Magazine', 'Materials', 'Special<br />Placement', 'Logo', 'Image', 'Text', 'Contact<br />Info', 'Everthing<br />In', 'Category', 'Status'],             colModel: [                 { name: 'Id', index: 'Id', hidden: true, hidedlg: true },                 { name: 'AccountName', index: 'AccountName', align: "left", resizable: true, search: true, width: 100 },                 { name: 'OnlineName', index: 'OnlineName', align: 'left', sortable: false, width: 80 },                 { name: 'ListingCategoryName', index: 'ListingCategoryName', width: 85, editable: true, hidden: false, edittype: "select", editoptions: { multiple: false, value: eval('(' + catList + ')') }, editrules: { required: false }, formatoptions: { disabled: false} }             ],             jsonReader: {                 root: "List",                 page: "CurrentPage",                 total: "TotalPages",                 records: "TotalRecords",                 userdata: "Errors",                 repeatitems: false,                 id: "0"             },             rowNum: $rows,             rowList: [10, 20, 50, 200, 500, 1000, 2000],             imgpath: jQueryImageRoot,             pager: $(item + 'Pager'),             shrinkToFit: true,             width: 1455,             recordtext: 'Traffic lines',             sortname: 'OrderDate',             viewrecords: true,             sortorder: "asc",             altRows: true,             cellEdit: true,             cellsubmit: "remote",             cellurl: editURL + '?rows=' + $rows + '&page=1',             loadComplete: function() {               },             gridComplete: function() {             },             loadError: function(xhr, st, err) {             },             afterEditCell: function(rowid, cellname, value, iRow, iCol) {                 var select = $(item).find('td.edit-cell select');                 $(item).find('td.edit-cell select option').each(function() {                     var option = $(this);                     var optionId = $(this).val();                     $(lookupData.ListingCategory).each(function() {                         if (this.Id == optionId) {                                                       if (this.OnlineName != $(item).getCell(rowid, 'OnlineName')) {                                 option.remove();                                 return false;                             }                         }                     });                 });             },             search: true,             searchdata: {},             caption: "List of all Traffic lines",             editurl: editURL + '?rows=' + $rows + '&page=1',             hiddengrid: hideGrid   Here is the JSON data returned via the ajax call during the jqGrid function call above (NOTE it must be { async: false}: {"ListingCategory":[{"Id":29,"Name":"Document Imaging & Management","OnlineName":"RF Globalnet"} ,{"Id":1,"Name":"Ancillary Department Hardware","OnlineName":"Healthcare Technology Online"} ,{"Id":2,"Name":"Asset Tracking","OnlineName":"Healthcare Technology Online"} ,{"Id":3,"Name":"Asset Tracking","OnlineName":"Healthcare Technology Online"} ,{"Id":4,"Name":"Asset Tracking","OnlineName":"Healthcare Technology Online"} ,{"Id":5,"Name":"Document Imaging & Management","OnlineName":"Healthcare Technology Online"} ,{"Id":6,"Name":"Document Imaging & Management","OnlineName":"Healthcare Technology Online"} ,{"Id":7,"Name":"EMR/EHR Software","OnlineName":"Healthcare Technology Online"}]} I only need the Id and Name for the drop down list, but the third column in the JSON object is important, it is the only that I match up with the OnlineName in the jqGrid column, and then in the loop during afterEditCell simply remove the ones I don't want the user to see. That's it!

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  • Developer Day - Hands-on Oracle 11g Applications Developmen

    - by [email protected]
    Developer Day - Hands-on Oracle 11g Applications DevelopmentSpend a day with us learning the key tools, frameworks, techniques, and best practices for building database-backed applications. Gain hands-on experience developing database-backed applications with innovative and performance-enhancing methods. Meet, learn from, and network with Oracle database application development experts and your peers. Get a chance to win a Flip video camera and Oracle prizes, and enjoy post-event benefits such as advanced lab content downloads.Bring your own laptop (Windows, Linux, or Mac with minimum 2Gb RAM) and take away scripts, labs, and applications*.Space is limited. "Register Now"  for this FREE event. Don't miss your exclusive opportunity to meet with Oracle application development & database experts, win Oracle Trainings, and discuss today's most vital application development topics.Information how to register soon.

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  • Can you delete the Humanity icon theme safely?

    - by Alex
    I'm trying to reduce used space after running disk usage analyser, since I'm using a 40GB SSD. The icons use quite a bit of space! Could I delete those that I don't use, such as humanity? (I use Faenza-Dark) If it is possible, what would be the best way to this? as when I attempt to remove humanity in the Software Centre it says the software-centre itself must be removed. Similar problems arise with synaptic package manager. I was wary of just deleting the unused directories in usr/share/icons/. Thanks for the help!

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  • Two new features in November 2009 CTP

    - by kaleidoscope
    Windows Azure Diagnostics Managed Library: The new Diagnostics API enables logging using standard .NET APIs. The Diagnostics API provides built-in support for collecting standard logs and diagnostic information, including the Windows Azure logs, IIS 7.0 logs, Failed Request logs, crash dumps, Windows Event logs, performance counters, and custom logs. Variable-size Virtual Machines (VMs): Developers may now specify the size of the virtual machine to which they wish to deploy a role instance, based on the role's resource requirements. The size of the VM determines the number of CPU cores, the memory capacity, and the local file system size allocated to a running instance. e.g.: <WebRole name=”WebRole1” vmsize=”ExtraLarge”> Supported values for the ‘vmsize’ are: 1. Small 2. Medium 3. Large 4.       ExtraLarge More information for Diagnostics Managed Library can be found at: http://msdn.microsoft.com/en-us/library/ee758705.aspx   Girish, A

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  • What are the downsides of leaving automation tags in production code?

    - by joshin4colours
    I've been setting up debug tags for automated testing of a GWT-based web application. This involves turning on custom debug id tags/attributes for elements in the source of the app. It's a non-trivial task, particularly for larger, more complex web applications. Recently there's been some discussion of whether enabling such debug ids is a good idea to do across the board. Currently the debug ids are only turned on in development and testing servers, not in production. There have been points raised that enabling debug ids does cause performance to take a hit, and that debug ids in production may lead to security issues. What are benefits of doing this? Are there any significant risks for turning on debug tags in production code?

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  • Oracle's Business Analytics Strategy Webcast

    - by Rob Reynolds
    Join Mark Hurd and Balaji Yelamanchili as they unveil the latest advances in Oracle’s strategy for placing analytics into the hands of every one of your decision-makers—so that they can see more, think smarter, and act faster. Learn about the latest developments in business intelligence technology and applications, advanced analytics, performance management applications, and engineered systems. You’ll find out how you can harness the exploding volumes of data being generated inside your organization—and beyond the firewall—to: Deliver real-time intelligence to your mobile workforce globally Forecast and plan at the speed of business Accelerate your financial close and reporting process Discover how Oracle business analytics can change the way you do business. Register today for this on demand event.

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  • Exalytics Disaster Recovery

    - by Saresh
    Q:Where can you find more information about Exalytics Disaster Recovery? Ans: Exalytics Disaster Recovery: http://docs.oracle.com/cd/E41246_01/bi.1/e39709/admin_dr.htm#BABCFGEC Note 1568360.1 -Oracle Exalytics Deployment Guide (Download the whitepaper attached to the Note) OBIEE http://docs.oracle.com/cd/E28280_01/bi.1111/e10541/backup.htm#CHDFEIGF Note 1316073.1 - OBIEE 11g: Recommended Strategies For Disaster Recovery or Backup Oracle Hyperion EPM http://docs.oracle.com/cd/E17236_01/epm.1112/epm_high_avail_11121.pdf (Though this is for Hyperion EPM 11.1.2.1, it is applicable to 11.1.2.2 as well) TimesTen: http://docs.oracle.com/cd/E21901_01/doc/timesten.1122/e21632/migrate.htmhttp://docs.oracle.com/cd/E21901_01/doc/timesten.1122/e21635/standbycache.htm#CBAJDJBD EPM Disaster Recovery : http://www.oracle.com/technetwork/middleware/bi-foundation/epm-dr-best-practice-130229.ppt Oracle® Enterprise Performance Management System Backup and Recovery Guide :http://docs.oracle.com/cd/E17236_01/epm.1112/epm_backup_recovery_1112200.pdf

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  • Oracle SOA Suite 11g Administrator's Handbook

    - by Antony Reynolds
    SOA Administration Book I have just received a copy of the “Oracle SOA Suite 11g Administrator's Handbook” so as soon as I have read it I will let you know what I think.  In the meantime the first thing that struck me was the author credentials, although I have never met either of them as I remember, I have read Admeds blog postings and they are a great community resource, so immediately I am well disposed towards the book.  Similarly Arun is an employee of my friend and co-author Matt Wright, and I have heard good things about him from Rubicon Red people. A first glance at the table of contents looks encouraging, I particularly like their approach to performance tuning where they give a clear concise explanation of the knobs they are using. More when I have read more.

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  • How to Make a 9 Layer Density Column [Video]

    - by Jason Fitzpatrick
    Density columns, layers of varying density liquid in a glass cylinder, are nothing new in the world of science demonstrations, but this nine layer one with seven floating objects is something to see. Courtesy of Steve Spangler Science, the experiment goes above and beyond the traditional five layer column by adding another four layers and sinking objects of varying density into the column. The end result is a colorful demonstration of the varying densities of liquids and solids. [via Boing Boing] How To Get a Better Wireless Signal and Reduce Wireless Network Interference How To Troubleshoot Internet Connection Problems 7 Ways To Free Up Hard Disk Space On Windows

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  • Heading in the Right Direction: Garmin Exadata adoption

    - by Javier Puerta
    A pioneer in global positioning system (GPS) navigation, Garmin International Inc. has been adopting Exadata to support the infrastructure that powered the company’s Oracle Advanced Supply Chain Planning, but also the company’s fitness segment, which provides customers with an online platform to store, retrieve, and interact with data captured using Garmin fitness products. The environment, which is built on an Oracle Database, processes approximately 40 million queries per week. Prior to using Oracle Exadata Database Machine, as the online offering grew in popularity, it began to face reliability issues that had negatively impacted the customer experience. We included the video testimonial in a previous post. Now you can find the a complete set of materials about this customer story Garmin Customer Reference Garmin video testimonial:  Garmin Consolidates on Exadata for 50% Performance Boost Profit Magazine article:  Heading in the Right Direction

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  • Grub failure after cat removed USB drive

    - by user76270
    I had a perfectly working Ubuntu Server system with U12.4 and Server installed and was setting up the mail system. When I was absent from my computer room my cat (furry type) apparently got to play with a USB dongle on an extension cable and removed it. The system went berserk and now will not boot. I ran Ubuntu 12.4 on the install disk and the directory structure and every thing appears to still be on the drives. How do I recover the GRUB boot section without the system repartitioning everything and wiping everything else? Please I am a total newb when it comes to Linux errors and fixing them.

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  • What is Logical Volume Management and How Do You Enable It in Ubuntu?

    - by Justin Garrison
    Logical Volume Management (LVM) is a disk management option that every major Linux distribution includes. Whether you need to set up storage pools or just need to dynamically create partitions, LVM is probably what you are looking for. Latest Features How-To Geek ETC How to Upgrade Windows 7 Easily (And Understand Whether You Should) The How-To Geek Guide to Audio Editing: Basic Noise Removal Install a Wii Game Loader for Easy Backups and Fast Load Times The Best of CES (Consumer Electronics Show) in 2011 The Worst of CES (Consumer Electronics Show) in 2011 HTG Projects: How to Create Your Own Custom Papercraft Toy Outlook2Evernote Imports Notes from Outlook to Evernote Firefox 4.0 Beta 9 Available for Download – Get Your Copy Now The Frustrations of a Computer Literate Watching a Newbie Use a Computer [Humorous Video] Season0nPass Jailbreaks Current Gen Apple TVs IBM’s Jeopardy Playing Computer Watson Shows The Pros How It’s Done [Video] Tranquil Juice Drop Abstract Wallpaper

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  • Funky Behavior NoTracking Query Entities

    I’ve been using a lot of NoTracking queries to grab lists of data that I don’t need change tracked. It enhances performance and cuts down on resources. There are some nuances about these entities, however. One of the interesting behaviors of EF4’s Lazy Loading is that even if you have entities that you have queried with NoTracking on, they will still lazy load related entities. Unless you’ve read this somewhere (it’s on the ADO.NET team’s blog post which introduces...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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  • Water Simulation in LIBGDX [on hold]

    - by Noah Huppert
    I am doing some R&D for a game and am now tackling the topic of water. The goal Make water that can flow. Aka you can have an origin point that water shoots out from or a downhill slope. Make it so water splashes, so when an object hits the water there is a splash. Aka: Actual physics water sim. The current way I know how to do it I know how to create a shader that makes an object look like its water by making waves. Combined with that you can check to see if an object is colliding and apply an upwards force to simulate buoyancy. What is wrong with that way The water does not flow No splashes Possible solutions Have particles that are fairly large that interact with each other to simulate water Possible drawbacks Performance. Question: Is there a better way to do water or is using particles as described the only way?

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  • Google Cloud Messaging (GCM) for turn-based mobile multiplayer server?

    - by Chris
    I'm designing a multiplayer turn-based game for Android (over 3g). I'm thinking the clients will send data to a central server over a socket or http, and receive data via GCM push messaging. I'd like to know if anyone has practical experience with GCM for pushing 'real-time' turn data to game clients. What kind of performance and limitations does it have? I'm also considering using a RESTful approach with GAE or Amazon EC2. Any advice about these approaches is appreciated.

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  • NorCal Weekly .Net is Up Now! Catch All for the .Net Events in Northern California!

      Ive always wanted a place that I could look through to find what .net events are going on in Northern California.  Ive found that there is a core group of people with common interested... This site is a resource for asp.net web programming. It has examples by Peter Kellner of techniques for high performance programming...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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  • Using RSYNC to Replicate Synology NAS DS710+ to Windows 7 Hard Drive

    Learn how to use a local backup drive on your windows 7 system to replicate the data on any or all of your directories on your Synology NAS (Network Hard Drive Device) DS710+.  This post will... This site is a resource for asp.net web programming. It has examples by Peter Kellner of techniques for high performance programming...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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