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  • What factors could cause the scalability issue on a 10-core CPU?

    - by JackWM
    I am tuning the performance of parallel Java programs. And want to check the impacts from the Architecture. I'm look into the Intel 10-core CPU, Intel(R) Xeon(R) CPU E7-L8867. I found my program only scales up to 5 cores. What could be the causes? I'm considering the Architecture effects. e.g. memory contention? More specifically, Are the 10 cores symmetric to each other? How many memory controllers does it have?

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  • Why is std::tr1::shared_ptr<>.reset() so expensive?

    - by Paul Oyster
    Profiling some code that heavily uses shared_ptrs, I discovered that reset() was surprisingly expensive. For example: struct Test { int i; Test() { this->i = 0; } Test(int i) { this->i = i; } } ; ... auto t = make_shared<Test>(1); ... t.reset(somePointerToATestObject); Tracing the reset() in the last line (under VC++ 2010), I discovered that it creates a new reference-counting object. Is there a cheaper way, that reuses the existing ref-count and does not bother the heap?

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  • Unsafe, super-fast cross-process memory buffer?

    - by John
    Cross-process memory buffers always have some overhead, and my understanding is this is quite high. But what if you're implementing a cross-process render-buffer, this isn't critically important in the same way as other data so are there techniques we can use to get 'raw' access to a chunk of memory from multiple processes, with no safety nets apart from it not crashing? Or do modern operating systems simply not work with unabstracted memory in a way to make this possible? I'm working in C++ but the question applies to Win XP/Vista/7, MacOSX 10.5+ (& Linux less importantly).

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  • Can Silverlight be linked with a C++ static library ?

    - by Niklaos
    Hi, I'm currently doing research to start a new project. This project will be in 2 parts a light Client (probably console) and an heavy one using silverlight. The light client must be cross-platform. However, they will both use the same Core (by the way, the core will need to use the sockets). I'd like to use C++ to build the light client but given that the core is common to both applications, it would be much appreciated if it's could be the same code. So the question is quite simple : Can Silverlight be compilated with a C++ static library ? And if it's possible, what about cross-platform issues (with moonlight) ? If it's not possible. Which language can i use to work with silverlight while being cross-platform ? Because of performance, a compilated language will be better ! Thanks for your expertise :)

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  • How to balance load in a Apache + Mongrel application

    - by Will
    I was wondering if someone can explain how can a rails application be balanced. Two questions: Does it even help having separate rails applications reading from the same database in the same dedicated server? I understand Apache can balance load installing some extra modules? am i right? how can we accomplish this? (please provide explanation for dummies)

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  • Does OpenCL allow concurrent writes to same memory address?

    - by Wonko
    Is two (or more) different threads allowed to write to the same memory location in global space in OpenCL? The write is always changing a uchar from 0 to 1 so the outcome should be predictable, but I'm getting erratic results in my program, so I'm wondering if the reason can be that some of the writes fail. Could it help to declare the buffer write-only and copy it to a read-only buffer afterwards?

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  • C++: how to build my own utility library?

    - by augustin
    I am starting to be proficient enough with C++ so that I can write my own C++ based scripts (to replace bash and PHP scripts I used to write before). I find that I am starting to have a very small collection of utility functions and sub-routines that I'd like to use in several, otherwise unrelated C++ scripts. I know I am not supposed to reinvent the wheel and that I could use external libraries for some of the utilities I'm creating for myself. However, it's fun to create my own utility functions, they are perfectly tailored to the job I have in mind, and it's for me a large part of the learning process. I'll see about using more polished external libraries when I am proficient enough to work on more serious, long term projects. So, the question is: how do I manage my personal utility library in a way that the functions can be easily included in my various scripts? I am using linux/Kubuntu, vim, g++, etc. and mostly coding CLI scripts. Don't assume too much in terms of experience! ;) Links to tutorials or places where relevant topics are properly documented are welcome.

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  • How to track folder permission event?

    - by Sushant
    Hi, This is about folder level permissions. We have a document library with break inheritance. While adding folders, sub folders through code, again we coded for break inheritance. Now the requirement is, when a user/group is added to subfolder permission list, we need to track this event. Which sharepoint event do we use and on what level. Please help.

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  • Symfony on virtual host (document root problem)

    - by Martin Sikora
    Hello, I'm developing an application in Symfony and on localhost (XAMPP) I want to simulate the same conditions as on the webserver. The web server is configured as follows: /www => mydomain.com /foo => foo.mydomain.com /bar => bar.mydomain.com ... I'm going to put my Symfony application into /www direcotry so there'll be: /www /www/apps /www/apps/frontend /www/apps/frontend/... /www/apps/backend /www/apps/backend/... /www/cache /www/config ... and so on... /www/web The thing is that the document root is still set to the /www directory but Symfony expects it in the /www/web. Of course it will work if I call http://mydomain.com/web but I guess you understand this is quiet stupid solution. So my question is: Is there any way how can I change/bypass the default document root setting using .htaccess or whatever?

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  • What components have you built that you are reusing over and over again for your desktop application

    - by Jason
    We are building our internal library of components up, and was wondering what everybody has in their library of reusable components for your organization, for desktop applications. Our list currently includes only a couple of components: Logon, Security and User Group functionality System Tray / Service Framework Component for Internet Communications (to handle proxies, security, etc...) Billing What else do you have, that we should add to our list? If you have reusable web components, save your answers... I will open a different question if this one is successful.

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  • enable_shared_from_this and inheritance

    - by DeadMG
    I've got a type which inherits from enable_shared_from_this<type>, and another type that inherits from this type. Now I can't use the shared_from_this method because it returns the base type and in a specific derived class method I need the derived type. Is it valid to just construct a shared_ptr from this directly? Edit: In a related question, how can I move from an rvalue of type shared_ptr<base> to a type of shared_ptr<derived>? I used dynamic_cast to verify that it really was the correct type, but now I can't seem to accomplish the actual move.

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  • I trying to start openerp-server with cron script

    - by user1650194
    I have a webfaction account and I install openerp-server 6.1.1, when a start the server from ssh session it's works, when I close the session it close the server too. So I'm trying to start the server with cron. From cron I call a script like this: */1 * * * * ~/webapps/openerp/start.sh And the script: .bash_profile openerp-server -c /home/usuario/webapps/openerp/server.conf It doesn't work.... But if I call the script from the command line the server load ok.... It any way to debug this?

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  • nm utility to get what is defined in .so file returns error

    - by Narek
    I need to get the symbols defined in .so file. I use latest Mac OS and I do this: /usr/bin/nm -gC libs/armeabi/libhello.so error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/nm: invalid argument -C Usage: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/nm [-agnopruUmxjlfAP[s segname sectname] [-] [-t format] [[-arch ] ...] [file ...] As I understand this is another nm utility? It is connected with XCode? How to fix this issue?

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  • Can two different versions of the same libs (with same name) exists in an application?

    - by Jay
    I have some scenario like this: Product- Platform- mylibs(version-1) Product- mylibs(version-2) i.e Product uses mylibs (version-2) directly. Product also uses platform (which is also a dynamic lib) and platform uses my libs (version-1). The names of the libs used by product and platform are same. Only versions are different and both these versions are not compatible. Is there a way with ".so" libs in linux that Platform can link to one version and product can link to another version of the same libs having the same name?

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  • Dir all files to output.log, including message "File Not Found"

    - by user316687
    I'm trying to dir a bunch of files with dos command: dir My dir.bat file: dir E:\documentos\57\Asiento\01\"Asiento 3 Modificacion de Estatuto.doc" dir E:\documentos\134\Asiento\01\"File Does Not Exist.doc" dir E:\documentos\55\Asiento\01\"Asiento 5 Padron de Afiliados Segunda Entrega.doc" The second one doesn't exist. Then, when running my bat: C:\myuser>E:\dir.bat > output.log I open output.log and don't find any message about the file that was not found. Output.log : E:\documentos>dir E:\documentos\57\Asiento\01\"Asiento 3 Modificacion de Estatuto.doc" Volume in drive E is New Volume Volume Serial Number is 0027-F7F6 Directory of E:\documentos\57\Asiento\01 20/12/2005 06:41 p.m. 40,960 Asiento 3 Modificacion de Estatuto.doc 1 File(s) 40,960 bytes 0 Dir(s) 17,053,155,328 bytes free E:\documentos>dir E:\documentos\134\Asiento\01\"File Does Not Exist.doc" Volume in drive E is New Volume Volume Serial Number is 0027-F7F6 Directory of E:\documentos\134\Asiento\01 E:\documentos>dir E:\documentos\55\Asiento\01\"Asiento 5 Padron de Afiliados Segunda Entrega.doc" Volume in drive E is New Volume Volume Serial Number is 0027-F7F6 Directory of E:\documentos\55\Asiento\01 08/08/2007 08:33 a.m. 40,960 Asiento 5 Padron de Afiliados Segunda Entrega.doc 1 File(s) 40,960 bytes 0 Dir(s) 17,053,151,232 bytes free Is there any way that output.log shows "File Not Found" message?

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  • USB drive errors after airport scan

    - by bobobobo
    Well, I just got a new PNY usb drive and it passed through an airport scanner yesterday. For some reason, I wrote to it and then tried to read from it today, and it gave me a corrupted error! chkdsk reports errors like: Bad links in lost chain at cluster 1179 corrected. Lost chain cross-linked at cluster 1200. Orphan truncated. Lost chain cross-linked at cluster 1228. Orphan truncated. Lost chain cross-linked at cluster 1236. Orphan truncated. Lost chain cross-linked at cluster 1237. Orphan truncated. Lost chain cross-linked at cluster 1244. Orphan truncated. Lost chain cross-linked at cluster 1250. Orphan truncated. Lost chain cross-linked at cluster 1266. Orphan truncated. Lost chain cross-linked at cluster 1278. Orphan truncated. etc. What is this from? Could it possibly be from the airport scanner, or is it likely a defective USB chip? How can I check the chip to see if I should just return/throw it away or continue to use it?

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  • How can I cluster short messages [Tweets] based on topic ? [Topic Based Clustering]

    - by Jagira
    Hello, I am planning an application which will make clusters of short messages/tweets based on topics. The number of topics will be limited like Sports [ NBA, NFL, Cricket, Soccer ], Entertainment [ movies, music ] and so on... I can think of two approaches to this Ask for users to tag questions like Stackoverflow does. Users can select tags from a predefined list of tags. Then on server side I will cluster them on based of tags. Pros:- Simple design. Less complexity in code. Cons:- Choices for users will be restricted. Clusters will not be dynamic. If a new event occurs, the predefined tags will miss it. Take the message, delete the stopwords [ predefined in a dictionary ] and apply some clustering algorithm to make a cluster and depending on its popularity, display the cluster. The cluster will be maintained according to its sustained popularity. New messages will be skimmed and assigned to corresponding clusters. Pros:- Dynamic clustering based on the popularity of the event/accident. Cons:- Increased complexity. More server resources required. I would like to know whether there are any other approaches to this problem. Or are there any ways of improving the above mentioned methods? Also suggest some good clustering algorithms.I think "K-Nearest Clustering" algorithm is apt for this situation.

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  • Setting execute permission on a Fedora 11 (host and guest) shared folder file is not working for me.

    - by pmr
    I have set up a VirtualBox Fedora 11 (i386) guest on my Fedora 11 (x86_64) host system with shared folders enabled. I mount the shared folder successfully with the recommended "mount -t vboxsf share /shareddir -o rw,exec,uid=500,gid=100" command. I can successfully read and write files in the share from the guest but I cannot set the execute bit on any file in the share from the guest system. Nothing in GoogleSpace seems to address my issue let alone provide a solution. fwiw, selinux is disabled on both the guest and host and the shared folder is an ext4 file system.

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  • Should all my files be stored on my shared partition?

    - by James
    I am setting up a tripple boot HD and was going to use a 4th partition to share files between OS's. I was wondering if there is any point in having much space on each OS partition to store files or if I just make the shared partition big and put everything on that? Is there any difference in speed between accessing files on the shared partition vs the native files? Are there any other benefits/disadvantages of having files on either the native/shared partition? EDIT: OS's in question are Windows 7, Ubuntu 12.04, and OS X 10.7.4.

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  • Is there a way to get a shared spreadsheet to update without closing and reopening?

    - by Mike
    Using Excel 2010, I have a spreadsheet that is used by 3 different people at any one time. But if one person has the spreadsheet open on there PC the other people can only view it as read only. I have since shared the workbook and put the spreadsheet on a shared network drive and now they can all view the spreadsheet at the same time and edit it at the same time. The problem is that nobody can see the changes that the other users have made unless the close out of the spreadsheet and open it up again to view the changes. I have checked the settings of the shared workbook and on the advanced tab have tick the option that updates the information every 5 minutes but the information does not update until you close out and open the spreadsheet back up again. How can I fix this problem?

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