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  • how to tune libstdc++ to the native architecture when building gcc

    - by John D
    I recently found that when I build my C++ software, I get about a 10% speedup by using the g++ march=native option. When compiling gcc and libstc++, is it possible to tune the libstdc++ library to the native architecture as well? I couldn't find any mention of this in the gcc install configuration documentation. (I'm building gcc 4.6.2 on Linux Mint 11 with an Intel Core i7 Sandy Bridge-E processor.)

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  • java.lang.OutOfMemoryError: unable to create new native thread

    - by Brad
    I consistently get this exception when trying to run my Junit tests on my mac: java.lang.OutOfMemoryError: unable to create new native thread at java.lang.Thread.start0(Native Method) at java.lang.Thread.start(Thread.java:658) at java.util.concurrent.ThreadPoolExecutor.addIfUnderMaximumPoolSize(ThreadPoolExecutor.java:727) at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:657) at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:92) at com.google.appengine.tools.development.ApiProxyLocalImpl$PrivilegedApiAction.run(ApiProxyLocalImpl.java:197) at com.google.appengine.tools.development.ApiProxyLocalImpl$PrivilegedApiAction.run(ApiProxyLocalImpl.java:184) at java.security.AccessController.doPrivileged(Native Method) at com.google.appengine.tools.development.ApiProxyLocalImpl.doAsyncCall(ApiProxyLocalImpl.java:172) at com.google.appengine.tools.development.ApiProxyLocalImpl.makeAsyncCall(ApiProxyLocalImpl.java:138) The same set of unit tests pass perfectly fine on ubuntu and windows. Some information about my system resources on the mac: $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited max locked memory (kbytes, -l) unlimited max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 1 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 266 virtual memory (kbytes, -v) unlimited $ java -version java version "1.6.0_24" Java(TM) SE Runtime Environment (build 1.6.0_24-b07-334-10M3326) Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02-334, mixed mode) The reason I dont think this is an application issue is because the same tests pass in different environments. I have tried setting heap to 1024m, 512m and setting the stack to 64k and 128k (and each of these combinations) with no luck. My open files was originally 256 and I have bumped this to 1024. I have been googling around for a bit and all posts say to decrease heap size and increase stack size but that doesnt seem to help. Anyone have anymore ideas? EDIT: Here are is some environment information on my ubuntu box: $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 20 file size (blocks, -f) unlimited pending signals (-i) 16382 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) unlimited virtual memory (kbytes, -v) unlimited file locks (-x) unlimited $ java -version java version "1.6.0_24" Java(TM) SE Runtime Environment (build 1.6.0_24-b07) Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)

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  • Native.* assemblyIdentity with Registration-free com

    - by moogs
    I set Isolated=true to some COM library that I need to use registration free. Visual studio now created Native.* manifest files for each of my assemblies: Why "Native"? Can I change this? Can someone point me to info I can read? (googling native / assembly / manifest is yield a lot of non-related info ) Is there a way I can embed these manifest files into the assembly DLL? Thanks!

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  • Destructors not called when native (C++) exception propagates to CLR component

    - by Phil Nash
    We have a large body of native C++ code, compliled into DLLs. Then we have a couple of dlls containing C++/CLI proxy code to wrap the C++ interfaces. On top of that we have C# code calling into the C++/CLI wrappers. Standard stuff, so far. But we have a lot of cases where native C++ exceptions are allowed to propagate to the .Net world and we rely on .Net's ability to wrap these as System.Exception objects and for the most part this works fine. However we have been finding that destructors of objects in scope at the point of the throw are not being invoked when the exception propagates! After some research we found that this is a fairly well known issue. However the solutions/ workarounds seem less consistent. We did find that if the native code is compiled with /EHa instead of /EHsc the issue disappears (at least in our test case it did). However we would much prefer to use /EHsc as we translate SEH exceptions to C++ exceptions ourselves and we would rather allow the compiler more scope for optimisation. Are there any other workarounds for this issue - other than wrapping every call across the native-managed boundary in a (native) try-catch-throw (in addition to the C++/CLI layer)?

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  • Get an array of structures from native dll to c# application

    - by PaulH
    I have a C# .NET 2.0 CF project where I need to invoke a method in a native C++ DLL. This native method returns an array of type TableEntry. At the time the native method is called, I do not know how large the array will be. How can I get the table from the native DLL to the C# project? Below is effectively what I have now. // in C# .NET 2.0 CF project [StructLayout(LayoutKind.Sequential)] public struct TableEntry { [MarshalAs(UnmanagedType.LPWStr)] public string description; public int item; public int another_item; public IntPtr some_data; } [DllImport("MyDll.dll", CallingConvention = CallingConvention.Winapi, CharSet = CharSet.Auto)] public static extern bool GetTable(ref TableEntry[] table); SomeFunction() { TableEntry[] table = null; bool success = GetTable( ref table ); // at this point, the table is empty } // In Native C++ DLL std::vector< TABLE_ENTRY > global_dll_table; extern "C" __declspec(dllexport) bool GetTable( TABLE_ENTRY* table ) { table = &global_dll_table.front(); return true; } Thanks, PaulH

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  • Risk to native OS from Live CD?

    - by Frost Shadow
    Will booting from a Live CD (I was thinking Anonym OS) have any risk to the native OS? I wanted to try it out on my school´s computer, but I´d rather not have to explain why I accidentally reformatted the HD and deleted everything.. I know once you´ve booted the right way, it shouldn´t leave any trace on the HD, but is it possible I can push some wrong button and end up trying to overwrite the native with the Live OS? Also, since the computer itself is connected to the internet, will the network administrator be able to see that i´ve booted from a Live CD? I´m thinking yes, but just thought I´d check. Thanks for any help!

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  • Use only external monitor at screen's native resolution

    - by joaoc
    My laptop's screen lamp just died (I can see content on the screen if I point a light at it) and I was using it with an external monitor. I can switch from extended desktop to mirrored mode but, and here is where I need help, the resolutions don't match. The laptop's resolution is 1600x1200 and the external monitor is 1680x1050. I am ok with just using one screen ATM but I would like for it to at least use the native resolution of the external monitor. This is Windows XP and under Monitor settings I only get the resolutions for the original monitor under mirrored mode. How can I force the screen into a resolution not supported by the laptop screen but that is a native resolution for the external monitor?

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  • For nodejs what are best design practices for native modules which share dependencies?

    - by Mark Essel
    Hypothetical situation, I have 3 node modules all native, A, B, and C.  A is a utilities module which exposes several functions to javascript through the node interface, in addition it declares/defines a rich set of native structures and functions B is a module which is dependent on data structures and source in A, it exposes some functions to javascript, in addition it declares/defines native structures and functions C is a module which is dependent on data structures and source in A & B, it exploses some functions to javascript, in addition it declares/defines native structures and functions So far when setting up these modules I have a preinstall script to install other dependent includes, but in order to access all of another modules source what is the best way to link to it's share library object (*.node) ? Is there an alternative best practice for native modules (such as installing all source from other modules before building that single module)? Reply

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  • Are there any significant advantages to using a native language for mobile app development?

    - by Karl Daniel
    Forgive me if this question has already been answered but I couldn't quite find the answer I was looking for. What I wanted to know was, is there any significant advantage to using a native language when developing and deploying apps to a mobile environment? The reason I ask is for a long while now I've been using Objective-C, Apple's native language for iOS, to build my apps. However I've been wondering whether or not there is any real benefit to doing this, over using a non-native language like JavaScript and then deploying it through a service like 'Phone Gap'? I do stress 'significant' advantages as native languages are always more likely to have the upper hand when it comes to speed and access to the latest APIs. However in general I don't see using a non-native language or a service like 'Phone Gap' causing and major slow down to my apps or restricting my development. Additionally having the ability to deploy to multiple services is also very handy indeed. This is why I put the question, are there any significant advantages to using a native language for mobile app development?

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  • Using native resolution on external display results in stretched, out of bounds image

    - by Roni Yaniv
    I have an HP min 311 netbook with Windows XP, which I've connected to a Samsung SyncMaster 2043BW display via the supplied analog cable. The external display's native res is 1680x1050, which the netbook's ION GPU supports. I've configured the external display as the single display (no cloning or any such fancy stuff). However, once I set the native res, the image just stretches out. It looks squashed, and it goes outside the monitor's edges. In contrast, lower resolutions manage to stay within the monitor's display edges, though obviously they are skewed in some way (vertically or horizontally). BTW, the only res which seems to be displayed relatively clearly (it's the least blurry) is 1280x720. I tried looking all over the web for an explanation/advice but could not find any. I already played with the settings on the external display itself several times. So either it's not that, or I missed something. Has someone run into this issue? I need help.

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  • Monitor flickers in native resolution.

    - by ptikobj
    With my new Samsung Syncmaster BX2450 I have the following problem: In Windows XP (SP2), all resolutions above 1440x900 have either strange pixel errors or an extreme flickering. It seems, that the effect worsens for higher resolutions. In special, I would like to run the monitor with its native resolution (1920x1080), however I can't watch longer than 5 seconds on the monitor because of the flickering... My Graphics Card is a Geforce FX 5200 with the most up-to-date driver (according to Nvidia.com: Forceware 175.19) and I'm having the monitor connected to its DVI-output. The strange thing is, under Ubuntu 10.04, all resolutions work just perfect, so the display must be alright. edit: seems to be a driver problem... if I use the proprietary NVIDIA drivers in Ubuntu, I have the same problem as in Windows. I would like to reformulate my question: Is there a modified/alternative Geforce FX 5200 driver (as there is in Ubuntu) for Windows that allows me to use 1920x1020 without problems ? I already tried the omega drivers: unfortunately, it still looks poor on the native resolution.

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  • Can aptitude for learning Programming paradigms be influenced by culture or native language's gramma

    - by DVK
    It is well known that different people have different aptitudes regarding various programming paradigms (e.g. some people have trouble learning non-procedural, especially functional languages. Some people have trouble understanding pointers - see Joel Spolsky's blog for musings on that. Some people have trouble grasping recursion). I was recently reading about a study that looked at how the grammar of someone's native language affected their speed of learning math. Can't find that article now but a quick googling found this reference. That led me to wondering whether someone's native culture or first language might affect their aptitude towards various programming paradigms. I'm more curious about positive influences - e.g. some trait that make it easier/faster for someone to learn a particular paradigm, for example native language grammar being very recursion-oriented. To be clear, I'm looking for how culture/language grammare may affect the difference between aptitude of the same person towards various paradigms as opposed to how it affects overall aptitude towards programming between different persons. Important: the only answers I'm interested in are either references to scientific studies, or personal observations from someone intimately familiar with a particular culture/language, including from their own experience. E.g. I'm not interested in your opinion of how Chinese being your first language affects anything unless you speak Chinese or worked with extremely large set of Chinese-native programmers extensively. I'm OK with your guesstimates not based on scientific studies, but please be sure to supply your reasoning about plausible causes of your observation. I'm not interested in culture-bashing (any such commends will be deleted or flagged for deletion). I'm also not particularly interested in culture-building - we all know Linus is from Finland and Tetris was written in Russia and Larry Wall is an American. Any culture/nation can produce a brilliant mind in any discipline. I'm interested in averages.

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  • iPhone apps: Webapps or native?

    - by jpartogi
    Hi all, I am planning to create an iPhone apps version for our online webapps. I am still new to iPhone apps development so I don't know whether to choose iPhone native or a webapps that runs on iPhone browser. The requirement is actually pretty basic. The iPhone apps need to submit data and get data from the database that is also used by the webapps. User would have the same access to the webapps, only I want this specific to iPhone, as the user experience would be different using a webapps and iPhone apps. I am also interested to sell the application on Apple store. Based on your experience, what would be better for this kind of requirement, iPhone native or webapps? What are the drawbacks building a native iPhone apps and webapps that runs on iPhone browser? Also, am I only limited to Objective-C to build a native iPhone apps? Or is there any other framework for that? Please be gentle on me, I am not starting a flamewar.

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  • "Attach to native process failed" with Apache 2.0 Agent 2.202 for RHEL5 Linux 64bit

    - by Richard
    In trying to install Apache 2.0 Agent 2.202 for RHEL5 Linux 64bit, the dialogue appears as follows. # export JAVAHOME=/usr/java/jdk1.6.0_24/; echo $JAVAHOME /usr/java/jdk1.6.0_24/ # ./setup Launching installer... Attach to native process failed On the server we have the following JREs and I've tried both. $ sudo rpm -qa | egrep "(openjdk|icedtea)" java-1.6.0-openjdk-1.6.0.0-1.27.1.10.8.el5_8 And SElinux appears to be off: # cat /etc/sysconfig/selinux SELINUX=disabled SELINUXTYPE=targeted

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  • Three native monitors on Dell OptiPlex 9010

    - by matthewk
    http://www.dell.com/uk/business/p/optiplex-9010/pd says: Configure your workspace the way you want it with support for up to three native monitors via DP/DP/VGA ports. So I ordered one, and have connected three monitors, but I can only enable two at a time. It can be both of the ones connected by DisplayPort, or one of the ones connected by DisplayPort and the one connected by VGA. Does anyone know whether it really is possible to enable all three at once, and if so, how?

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  • Alternatives to native LDAP

    - by Matt
    We've implemented an LDAP to NIS solution and have begun transitioning some systems to native LDAP binding for authentication and automount maps. Unfortunately we have a very mixed environment with more than 20 *nix environments. The setup for each variant is of course unique and has required various workarounds to get full functionality. We're now at the point where we're willing to revisit the solution and possibly migrate toward something like Likewise (http://www.likewise.org), but would like to know what others are using to solve this problem.

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  • Sharepoint and SSRS Native Integration - Not seeing web parts after cabinet file install

    - by Greg_the_Ant
    I followed the steps here to set up Sharepoint integration with reporting services (SSRS) using native mode. (i.e., get a report explorer and viewer web parts) However after adding the cabinet file e.g., STSADM.EXE -o addwppack -filename "C:\ Program Files\Microsoft SQL Server\100\Tools\Reporting Services\SharePoint\RSWebParts.cab" -globalinstall I still don't see report explorer in the web parts list. I'm very stuck and confused :-(

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  • Windows 8 Native App in Asp.net MVC?

    - by xiao
    I was not sure if this should be here or stackoverflow. I am looking at developing some windows 8 apps. I come from a web background and was really intrigued that you make them with html and javascript. I started to think though why can't you use asp.net mvc to build a windows 8 application. My question is can you somehow use asp.net mvc to build a native windows 8 application or are you suck with javascript and html?

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  • Remote access to Microsoft Dynamics NAV (C/Side) with native non-SQL database

    - by Joannes Vermorel
    I am facing a company that have a fairly recent Microsoft Dynamics NAV (C/Side) setup that comes with a non-SQL storage system called the native database server. I would need to be remotely connect to this database, and perform what would equate to SQL queries with very modest needs (no join, no complex filtering). I am rather ignorant of this technology, does someone knows to how make remote queries to this ERP?

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