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  • EBS+RAID10+XFS slower than EBS+RAID10+EXT3 using MySQL?

    - by Johann Tagle
    We're currently using EC2 with 16 EBS volumes in RAID10 configuration for our MySQL data. I know some people don't recommend to put EBS volumes to RAID but that's not what I'm concerned about at the moment. Current format is ext3, but we're experimenting with moving to xfs, given many reports that it is faster. However, we're actually experiencing a performance degradation when the partition was converted to xfs - a benchmark run with inserts, updates, selects and deletes was more than 10 seconds slower using xfs. Any idea what could be the problem? Below is the fstab entry (really only changed ext3 to xfs). Database tables are innodb and we are using innodb_file_per_table. /dev/mapper/vg_data-lv_data /data xfs noatime 0 0 Thanks.

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  • A good solution for displaying galleries with lytebox and php

    - by Johann
    Hello I have thought for a while over an issue with the loading of images on a website-solution that I have programmed (For fun and the experience) The programming language used is PHP with MYSQL as the database language It also uses javascript, but not extensively I have recently realized that the engine I programmed, while it has it's smart solutions also carry a lot of flaws and redundant code. I have therefore decided to make a new one, now incorporating what I know, but didn't when I started the previous project. For the new system, there will be an option to add galleries to a site, and upload images to it. I have used the javascript image viewer Lytebox before. The screen goes dark and an image appears with a "Previous" and "next" button to view the other images. The problem is that I used groups with lytebox and the images themselves, resized as thumbs. This causes lytebox to work only when all the images have loaded. If you click a link before that, the image is shown as if you right click and choose "Show image" Information about these images is parsed from a database using a while statement with a counter that goes from 0 to sizeof() I'm thinking it probably isn't a good idea to have the images as the thumbs, even if you restrict the upload size. Likewise, adding thumbs at upload also seems like a hassle. It would be practical if the thumbs didn't show up before they were fully loaded. Has anyone got any good tips. Any help would be appreciated. Johann

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  • How do I enable the globalmenu / appmenu on XFCE?

    - by Johann Philipp Strathausen
    I have tried various tricks I could find to install the global menu on xfce and lxde on the latest oneiric, but nothing worked. Does anyone have an idea on how to do that? Thanks. Here's what I've tried so far: the gnome global menu panel plugin (for lucid) via the xfapplet plugin (not in the official repos anymore) that can embedd gnome plugins into the xfce panel - unfortunately, the globalmenu doesn't show up in the xfapplet list of available gnome plugins (there's only one item in it) all instructions from an older question about globalmenu and its duplicate compiling manually the latest version from gnome2-globalmenu there is another question along with a solution for XFCE 4.8, but it's not working on Oneiric. It is also proposing to install the global menu applet from gnome using it via xfapplet. I've even found an XFCE-plugin for the global menu, but it keeps crashing when I add it to the panel - also I could not install all the packages due to some unmet dependencies I've added some code to ~/.config/xfce4/xinitrc as described in 10. of the FAQ of gnome2-globalmenu though I'm not sure what effect this should have.

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  • How to build MVC Views that work with polymorphic domain model design?

    - by Johann de Swardt
    This is more of a "how would you do it" type of question. The application I'm working on is an ASP.NET MVC4 app using Razor syntax. I've got a nice domain model which has a few polymorphic classes, awesome to work with in the code, but I have a few questions regarding the MVC front-end. Views are easy to build for normal classes, but when it comes to the polymorphic ones I'm stuck on deciding how to implement them. The one (ugly) option is to build a page which handles the base type (eg. IContract) and has a bunch of if statements to check if we passed in a IServiceContract or ISupplyContract instance. Not pretty and very nasty to maintain. The other option is to build a view for each of these IContract child classes, breaking DRY principles completely. Don't like doing this for obvious reasons. Another option (also not great) is to split the view into chunks with partials and build partial views for each of the child types that are loaded into the main view for the base type, then deciding to show or hide the partial in a single if statement in the partial. Also messy. I've also been thinking about building a master page with sections for the fields that only occur in subclasses and to build views for each subclass referencing the master page. This looks like the least problematic solution? It will allow for fairly simple maintenance and it doesn't involve code duplication. What are your thoughts? Am I missing something obvious that will make our lives easier? Suggestions?

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  • Java applet needs permission but doesn't ask for it!

    - by Karl Jóhann
    I'm trying to connect a VPN connection (on Mac OS X 10.6.6) through a Check point java applet. The first time it ran I chose NOT to give it access to my files and such and now every time I try to lunch the applet it tells me too "Please confirm the use of this Java applet and then refresh or reopen the window." But I don't know how to confirm it nor delete the applet. How can I change the permissions afterwards and where can I find java applets installed on my computer? Update: This turns out to be a problem in Firefox. Cleared cookies, Java cache and certificate in Safari and it seems to work.

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  • Centos 5.5 [Read-only file system] issue after rebooting

    - by canu johann
    I have a virtual server under centos 5.5 (hosted by a japanese company called sakura ) Since yesterday, connection through ssh couldn't be established. I've contacted support center who told me to restart VS from the control panel. After restarting, I got the message below Connected to domain wwwxxxxxx.sakura.ne.jp Escape character is ^] [ OK ] Setting hostname localhost.localdomain: [ OK ] Setting up Logical Volume Management: No volume groups found [ OK ] Checking filesystems Checking all file systems. [/sbin/fsck.ext4 (1) -- /] fsck.ext4 -a /dev/vda3 / contains a file system with errors, check forced. /: Inodes that were part of a corrupted orphan linked list found. /: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. (i.e., without -a or -p options) @@cat: /proc/self/attr/current: Invalid argument Welcome to CentOS Starting udev: @[ OK ] Setting hostname localhost.localdomain: [ OK ] Setting up Logical Volume Management: No volume groups found [ OK ] Checking filesystems Checking all file systems. [/sbin/fsck.ext4 (1) -- /] fsck.ext4 -a /dev/vda3 / contains a file system with errors, check forced. /: Inodes that were part of a corrupted orphan linked list found. /: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY. (i.e., without -a or -p options) [FAILED] *** An error occurred during the file system check. *** Dropping you to a shell; the system will reboot *** when you leave the shell. *** Warning -- SELinux is active *** Disabling security enforcement for system recovery. *** Run 'setenforce 1' to reenable. /etc/rc.d/rc.sysinit: line 53: /selinux/enforce: Read-only file system Give root password for maintenance (or type Control-D to continue): bash: cannot set terminal process group (-1): Inappropriate ioctl for device bash: no job control in this shell bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system bash: cannot create temp file for here-document: Read-only file system (Repair filesystem) 1 # setenforce 1 setenforce: SELinux is disabled (Repair filesystem) 2 # echo 1 (Repair filesystem) 4 # /etc/init.d/sshd status openssh-daemon is stopped (Repair filesystem) 5 # /etc/init.d/sshd start Starting sshd: NET: Registered protocol family 10 lo: Disabled Privacy Extensions touch: cannot touch `/var/lock/subsys/sshd': Read-only file system (Repair filesystem) 6 # sudo /etc/init.d/sshd start sudo: sorry, you must have a tty to run sudo (Repair filesystem) 7 # I have 4 site in production and I need to restart the server quickly (SSH + HTTPD ,...). Thank you for your time.

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  • How to configure my hosting provider for email when DNS redirection already in place?

    - by Johann
    First of all I apologize for my poor understanding of network and I hope I used the correct terminology for everything: I have bought a domain name with 1&1 to create an online shop, using kingeshop. I followed the steps explains here to point the domain name to kingeshop IP address and everything is working fine. Now I would also like to use my domain name to create an email account. But 1&1 seems to say they're not responsible for this now the DNS is transfered to kingeshop's. What I'm wondering is who is really "in charge" of my domain name now? 1&1 also lets me configure the MX-record but I don't have a clue what I can do with this. Could I just use an existing gmail address somehow? Thanks a lot for any help or clarity you can bring me on that matter!

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  • Deploying website content via Subversion

    - by Johann
    we have recently set up a new development infrastructure and process for one of our clients. This involves the strict use of subversion as a central source code repository. The svn repositories contains a seperate branch for code on the live system (/branches/live/). The repositories are use for PHP content (mainly Wordpress Blogs), but in future they may hold other asp code as well. Bonus points for a solutions which more or less in the same way with ASP code on Windows Server 2008 R2. We have two servers: one staging system and one live system. The staging system is updated regularly with the code of the trunk. The live system is update manually. Each webroot on the servers are working copy of either the trunk (staging system) or the live branch (live system). The current workflow is: Developing on the dev's box - commit into the trunk - auto-deploy on staging system - testing on the staging system - merging into /branches/live/ - manual deployment on live system. This works for one-way changes very well, however we have some troubles on every wordpress (or plugin) update: The WP update process removes the directories and unpack the archive of the new version. This removes the svn admin area as well, which produces a lot of errors. We could switch to SVN 1.7 with a single, global admin area, but this would only solve on part of the problem. Finally, we have done the update via the WP Gui, restored the svn admin area, added/removed the files and committed the changes to the trunk. After testing, we had to do basically the same thing on the live server (except the commit, we just reverted the changes and merged the new files from the staging system to the live system). I'm currently thinking of the following: The htdocs of each website is a svn export Each website has a svn working copy beside the htdocs directory a script which "replays" the changes in the wc from htdocs after an update in WP (rsync'ing the changed files to the working copy, rsync'ing new files and svn add them and finally svn delete the deleted files). The script would have to exclude some files (like wp-config.php, uploads/temp directories, etc.). Are there better ways to do this? Unfortunaly, a complete CI server is out of scope due to time and budget limitations.

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  • Why can't I copy a 7 GB file to an external USB HD with 120 GB free?

    - by Johann Gerell
    Yes, why can't I? I was stashing away some old photography backup zips last night. I could copy 4 of my 1 GB backup zips to my external USB connected hard-drive when I got the error message "Cannot copy file. Not enough free space." (sort of) for a zip of roughly 7 GB. But there are 120 GB free. Why is this? EDIT: Clarification - the files that I could copy was smaller than 4 GB. The failing one was 7 GB. The cause seems to be the FAT32 4 GB limit.

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  • nodejs server hanging from time to time

    - by Johann Philipp Strathausen
    I have a node server (0.6.6) running an Express application, along with Mongoose and s3, on an Ubuntu 11.04 machine. Several times per hour, the server is hanging. That means that the application is working fine, I see the express loggings, and then all of a sudden the server stops responding. No errors, no traces, no loggings, and strangely enough the browser won't show the request even in the network debugging window. From any machine in the local network it's the same behaviour. I restart the server and it's okay again for several minutes, then again starts to hang, everytime while doing something different. The same application on Amazon on the same Ubuntu version works fine and never hangs. I know all this is kind of vague, but I don't know where to start. Has any of you seen something like this before? Any idea?

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  • Missing help files for Microsoft.WindowsMobile in Visual Studio 2008 help system

    - by Johann Gerell
    I've just installed the Windows Mobile 6.5.3 DTK, both standard and professional. Before that I had the standard and professional Windows Mobile 6 SDKs. All Windows Mobile help pages are missing in Visual Studio 2008's help system - in particular everything in the Microsoft.WindowsMobile namespace. Microsoft.WindowsMobile.DirectX is there, but it's not part of the Windows Mobile 6 SDK or 6.5.3 DTK. If I open the WM6 docs from the freshly created program group, then it's all fine and dandy, but there doesn't seem to have been a proper integration with VS during installation. Any ideas what's gone wrong and how to fix it?

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  • PROPSHEETHEADER and PSH_PIVOT to get the horizontal pivot scroll?

    - by Johann Gerell
    Windows Mobile 6.5.3 has a "touch friendlier" pivot at the top of the screen instead of tabs at the bottom. In the docs for PROPSHEETHEADER, the dwFlag value PSH_PIVOT is documented: PSH_PIVOT Applies to Windows Mobile 6.5.3 Replaces dialog box tabs with a simple pivot (horizontal spinner). It's supposed to bed defined in prsht.h, but it's not. My 6.5.3 and 6 headers differ only in this: #define PSM_GETPIVOTCONTROL (WM_USER + 119) #define PropSheet_GetPivotControl(hDlg) \ (HWND)SNDMSG(hDlg, PSM_GETPIVOTCONTROL, 0, 0) which is in the 6.5.3 prsht.h, but not in the 6 one. What's the value of PSH_PIVOT? Did they forget to include it?

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  • Unit testing .Net CF apps on Windows Mobile 6.5.3 in Visual Studio 2008

    - by Johann Gerell
    Did anyone get that to work? I mean, unit testing .Net CF apps on Windows Mobile 6.5.3 in Visual Studio 2008. It works great for a WM 6 Pro target, but not for a WM 6.5.3 target. I get this error: The test adapter ('Microsoft.VisualStudio.TestTools.TestTypes.Unit.UnitTestAdapter, Microsoft.VisualStudio.QualityTools.Tips.UnitTest.Adapter, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a') required to execute this test could not be loaded. Check that the test adapter is installed properly. Not enough storage is available to process this command. Yes, I can read the error text, but I don't understand the failed run. Any clues?

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  • Why isn't the reference counter in boost::shared_ptr volatile?

    - by Johann Gerell
    In the boost::shared_ptr destructor, this is done: if(--*pn == 0) { boost::checked_delete(px); delete pn; } where pn is a pointer to the reference counter, which is typedefed as shared_ptr::count_type -> detail::atomic_count -> long I would have expected the long to be volatile long, given threaded usage and the non-atomic 0-check-and-deletion in the shared_ptr destructor above. Why isn't it volatile?

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  • Is there a better way to convert SQL datetime from hh:mm:ss to hhmmss?

    - by Johann J.
    I have to write an SQL view that returns the time part of a datetime column as a string in the format hhmmss (apparently SAP BW doesn't understand hh:mm:ss). This code is the SAP recommended way to do this, but I think there must be a better, more elegant way to accomplish this TIME = case len(convert(varchar(2), datepart(hh, timecolumn))) when 1 then /* Hour Part of TIMES */ case convert(varchar(2), datepart(hh, timecolumn)) when '0' then '24' /* Map 00 to 24 ( TIMES ) */ else '0' + convert(varchar(1), datepart(hh, timecolumn)) end else convert(varchar(2), datepart(hh, timecolumn)) end + case len(convert(varchar(2), datepart(mi, timecolumn))) when 1 then '0' + convert(varchar(1), datepart(mi, timecolumn)) else convert(varchar(2), datepart(mi, timecolumn)) end + case len(convert(varchar(2), datepart(ss, timecolumn))) when 1 then '0' + convert(varchar(1), datepart(ss, timecolumn)) else convert(varchar(2), datepart(ss, timecolumn)) end This accomplishes the desired result, 21:10:45 is displayed as 211045. I'd love for something more compact and easily readable but so far I've come up with nothing that works.

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  • boost smart pointers and BOOST_NO_MEMBER_TEMPLATES

    - by Johann Gerell
    After some struggling I managed to get boost smart pointers to build for Windows CE/Mobile at warning level 4. I found the least-resistance-way to get rid of compile errors and warnings to be #define BOOST_NO_MEMBER_TEMPLATES What does it actually mean? Did I sell my soul to the devil? Will all hell break loose when I actually use the types?

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  • Wordpress "Home" link

    - by Johann
    Hi all, I'm working on a Sandbox based Wordpress theme and I would like to add a home link as a first item in the navigation. I know I should change the function in "sandbox_globalnav" in the functions.php file, which is: // Produces a list of pages in the header without whitespace function sandbox_globalnav() { if ( $menu = str_replace( array( "\r", "\n", "\t" ), '', wp_list_pages('title_li=&sort_column=menu_order&echo=0') ) ) $menu = '<ul>' . $menu . '</ul>'; $menu = '<div id="menu">' . $menu . "</div>\n"; echo apply_filters( 'globalnav_menu', $menu ); // Filter to override default globalnav: globalnav_menu } However, my PHP skills are really basic and I'm not sure where I should override this. Thanks!

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  • Did anyone give these smart pointers (auto_any, scoped_any, shared_any) a test drive?

    - by Johann Gerell
    I'm investigating smart pointers with "shared" functionality for Windows CE and Mobile, where the VS 2008 tr1 std::shared_ptr cannot be used (due to linkage to a v.9 dll not present on CE, obviously, if I understand it correctly). There's a semi-old MSDN Magazine article with sources from a Microsoftie (Eric Niebler): Achieve More Reliable Resource Management with Our Custom C++ Classes. The reasoning, design and implementation of his shared_any looks solid, but I'm wondering if anyone ever actually tested the lot on any platform (not necessarily WinCe/WM)?

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  • Ambiguous access to base class template member function

    - by Johann Gerell
    In Visual Studio 2008, the compiler cannot resolve the call to SetCustomer in _tmain below and make it unambiguous: template <typename TConsumer> struct Producer { void SetConsumer(TConsumer* consumer) { consumer_ = consumer; } TConsumer* consumer_; }; struct AppleConsumer { }; struct MeatConsumer { }; struct ShillyShallyProducer : public Producer<AppleConsumer>, public Producer<MeatConsumer> { }; int _tmain(int argc, _TCHAR* argv[]) { ShillyShallyProducer producer; AppleConsumer consumer; producer.SetConsumer(&consumer); // <--- Ambiguous call!! return 0; } This is the compilation error: // error C2385: ambiguous access of 'SetConsumer' // could be the 'SetConsumer' in base 'Producer<AppleConsumer>' // or could be the 'SetConsumer' in base 'Producer<MeatConsumer>' I thought the template argument lookup mechanism would be smart enough to deduce the correct base Producer. Why isn't it? I could get around this by changing Producer to template <typename TConsumer> struct Producer { template <typename TConsumer2> void SetConsumer(TConsumer2* consumer) { consumer_ = consumer; } TConsumer* consumer_; }; and call SetConsumer as producer.SetConsumer<AppleConsumer>(&consumer); // Unambiguous call!! but it would be nicer if I didn't have to...

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  • Drawbacks with reading and writing a big file to or from disk at once instead of small chunks?

    - by Johann Gerell
    I work mainly on Windows and Windows CE based systems, where CreateFile, ReadFile and WriteFile are the work horses, no matter if I'm in native Win32 land or in managed .Net land. I have so far never had any obvious problem writing or reading big files in one chunk, as opposed to looping until several smaller chunks are processed. I usually delegate the IO work to a background thread that notifies me when it's done. But looking at file IO tutorials or "textbook examples", I often find the "loop with small chunks" used without any explanation of why it's used instead of the more obvious (I dare to say!) "do it all at once". Are there any drawbacks to the way I do that I haven't understood?

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  • For programming content, what simple-to-use-and-setup PHP based blog are the preferred ones?

    - by Johann Gerell
    I've since long wanted a place I can toss my programming related nuggets at. Every day I feel I solve something that I'll surely hit again in a not so distant future, but by then I most certainly will have forgotten about the previous solution I came up with. So I need to blog it down, quick and dirty, for my own documentation and memory's sake. Must be easy to set up and use. Must handle code syntax and highlighting gracefully for a number of languages, but mainly C# and C++. Must be PHP-based, because that's what my host supplies. I know and have used WordPress (not for code, though), but is it really what I want or need?

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