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• Google active la réponse et l'update partielle dans son Data protocol, pour faciliter la mise à jour

  Google active la réponse partielle et l'update partielle dans son Data protocol, pour faciliter la mise à jour de ses APIs Dans le but de booster la rapidité de ses APIs, Google Data Protocol (qui permet aux développeurs d'écrire des applications liées avec les données contenues dans les produits Google) s'est vu attribué deux nouvelles fonctionnalités cette semaine, au stade expérimental : la réponse partielle, et l'update partielle. Conjointement, ces deux fonctions "peuvent significativement réduire les ressources consommées par le réseau, la mémoire et le CPU" dont on a besoin pour travailler avec les APIs de Google. Pour expliquer le rôle de la réponse partielle, l'équipe du Google Data Protocol donne ...

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• How can I find out how much memory an object of a C++ class consumes?

  - by Shadow

  Hi, I am developing a Graph-class, based on boost-graph-library. A Graph-object contains a boost-graph, so to say an adjacency_list, and a map. When monitoring the total memory usage of my program, it consumes quite a lot (checked with pmap). Now, I would like to know, how much of the memory is exactly consumed by a filled object of this Graph-class? With filled I mean when the adjacency_list is full of vertices and edges. I found out, that using sizeof() doesn't bring me far. Using valgrind is also not an alternative as there is quite some memory allocation done previously and this makes the usage of valgrind impractical for this purpose. I'm also not interested in what other parts of the program cost in memory, I want to focus on one single object. Thank you.

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• What is the result of "new int[ 0 ]"? [closed]

  - by ArunSaha

  Possible Duplicates: What does zero-sized array allocation do/mean? C++ new int[0] — will it allocate memory? int * p; p = new int[ 0 ]; What is the expected outcome when new is called for zero number of elements? Is the outcome defined or undefined? Further, is it okay to call delete [] p; on that pointer? What is the intuition/analogy to this situation of pointer to an array of zero elements? Thanks in advance. Regards, Arun

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• Problems while installing Ubuntu 12.04 64 & 32 bits from LiveCd

  - by user76104

  I am trying to install Ubuntu on my new pc but I am encountering problems. When I boot from the installation CD, everything runs fine until the "window" when the user has to decide to Try Ubuntu or Install it in the machine. Well that "window" appears in blank, and my mouse and keyboard behaves really slow. I can't do anything , so i have to shut it down by pressing power button. The specification of my pc are this Motherboard: Gigabyte ex58 ud7 CPU: i7 950 HD: Western digital caviar black Int. memory: 6gb memory corsair Graphics: evga gtx580 I really need to install Ubuntu or another Linux distribution, i am using de seismic Unix program {Edit : Guess it is this} on my laptop. I hope someone can help me.

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• malloc unable to assign memory + doesnt warn

  - by sraddhaj

  char *str=NULL; strsave(s,str,n+1); printf("%s",str-n); when I gdb debug this code I find that the str value is 0x0 which is null and also that my code is not catching this failed memory allocation , it doesnt execute str==NULL perror code ...Any idea void strsave(char *s,char *str,int n) { str=(char *)malloc(sizeof(char)* n); if(str==NULL) perror("failed to allocate memory"); while(*s) { *str++=*s++; } *str='\0'; }

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• L'Unreal Engine 3 fonctionne sur Windows 8 RT, le moteur d'Epic Games tente de prendre des parts de marché à Unity

  L'Unreal Engine 3 fonctionne sur Windows 8 RT Une réponse logique de la part de Epic Games, face à la récente annonce de Unity. Après l'annonce du support de Windows 8 et Windows Phone 8 par Unity 3D, NVIDIA propose une vidéo montrant la démo porte-étendard pour les plateformes mobiles : Epic Citadel, de l'Unreal Engine 3. Elle fonctionne sur la tablette ASUS Vivo Tab RT, intégrant un NVIDIA Tegra. Pour rappel, ce processeur basé sur l'architecture ARM, combine CPU et GPU sur une même puce. Un des points ...

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• ubuntu freezes daily

  - by alme1304

  I have been using ubuntu daily for about 2 weeks now. I really like it but I have noticed that it freezes daily when I have things like chromium and firefox open or when I start watching videos. I realize these might be memory intensive apps/actions but I doubt that with my comps specs they would cause it to freeze. When I installed ubuntu, I remember that it warned me about installing it in a ext2 partition and not in a ext4 one. Could that be the issue? and is there a way to fix it without reinstalling? edit: specs are, 1.9gb ram & Intel® Core™2 CPU 6400 @ 2.13GHz × 2; ubuntu 12.04x64

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• How to Determine VPS Hosting Resources Needs for my upcoming Wordpress blog? How much resources should i purchase? [closed]

  - by Ishwar dixit

  Possible Duplicate: How to find web hosting that meets my requirements? Decided to purchase VPS hosting but Getting confused on amount of Resources i need? Wordpress will be used as platform, The blog i want to setup is assumed to have a traffic between 20k - 25k Visits per day with a rate of 5 pageviews per visit... there is No Download Facility provided...the content of the blog will be Text, Images & videos (will be used rarely)... The main question is? For the above requirement: How much RAM will be enough? How much CPU usage i will need? How much Bandwidth will be enough? How much Disk Space? Any other Requirement? Thanx in Advance..

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• How to get notified of modification in the memory in Linux

  - by Song Yuan

  In a userspace program in Linux, I get a piece of memory via allocation from the heap, then the pointer is distributed to a lot of other components running in other threads to use. I would like to get notified when the said piece of memory is modified. I can of course develop a custom userspace solution for other components to use when they try to modify the memory. The problem in my case is that these are legacy components and they can write to memory in many occasions. So I'm wondering whether there is a similar API like inotify (get notified when file is changed) or other approaches in order to get notified when a piece of memory is changed. I considered using mmap and inotify, which obviously won't work if the changes are not flushed. Any suggestions are appreciated :-)

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• How can I find out how much memory an instance of a C++ class consumes?

  - by Shadow

  Hi, I am developing a Graph-class, based on boost-graph-library. A Graph-object contains a boost-graph, so to say an adjacency_list, and a map. When monitoring the total memory usage of my program, it consumes quite a lot (checked with pmap). Now, I would like to know, how much of the memory is exactly consumed by a filled object of this Graph-class? With filled I mean when the adjacency_list is full of vertices and edges. I found out, that using sizeof() doesn't bring me far. Using valgrind is also not an alternative as there is quite some memory allocation done previously and this makes the usage of valgrind impractical for this purpose. I'm also not interested in what other parts of the program cost in memory, I want to focus on one single object. Thank you.

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• Limitation of high level languages? [closed]

  - by user1705796

  My question may look bit philosophical and nonsense! But I need to know kind of instructions those are not well suitable in high level languages even in c? Or rarely use in the development of software? Like read/write content of CPU registers may useful in debugging programs. And access to cache memory required when developing OS (maybe I am wrong at this point). Is this kind of instruction available languages like Java, Python, C? I also have a second question: And Why all high level languages not having same uniform syntax; at-least same standard library interface name? In python there is and. Or operator is almost same as && and ||. I think Python is developed after C but space indentation is compulsory in Python. Why Python does not use brackets {}. I already know this question going to be highly down-voted.

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• Using std::bad_alloc for C pointers

  - by otibom

  I'm using a library written in C in a C++ project. I'd like to use C++ exceptions to handle C errors. In particular, it would be nice to have an exception thrown if an allocation fails. I can do this in constructors of classes which hold C-style pointers to C structs : if (c_object == NULL) throw std::bad_alloc(); But if the class is responsible for several C objects they are no ways of free-ing all already allocated pointers since the destructor isn't called. I have a feeling I could use smart-pointers, but I don't have much experience with them. What's more, I have to have access to the original C pointers to use the C api properly. Is there an elegant solution to this ?

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• question related to Iphone autorelease usage

  - by user524331

  Could someone help me please understand how allocation and memory management is done and handled in following scenario. i am giving a Psuedo code example and question thats troubling me is inline below: interface first { NSDecimalNumber *number1; } implementation ..... -(void) dealloc { [number1 release]; [super dealloc]; } ================================= interface second { NSDecimalNumber *number2; } implementation second ..... - (First*) check { First *firstObject = [[[First alloc] init] autorelease]; number1 = [[NSDecimalNumber alloc] initWithInteger:0]; **// do i need to autorelease number1 as well?** return firstObject; }

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• Adobe After Efects Plugin With Cocoa (Overriding malloc)

  - by mustISignUp

  Messing about a bit, i have a working Adobe After Effects plugin with a bit of Obj-c / Cocoa in it (NSArray and custom objects - not ui stuff). The SDK guide states:- Always use After Effects memory allocation functions. In low-memory conditions (such as during RAM preview), it’s very important that plug-ins not compete with After Effects for OS memory, and deal gracefully with out-of-memory conditions. Failing to use our functions can cause lock-ups, crashes, and tech support calls. Don’t do that. If you’re wrapping existing C++ code, overloading new and delete to use our functions will save substantial reimplementation. On Windows, derive all classes from a common base class which implements new and delete. so my question.. is something compatible with the above statement possible in Obj-c?

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• Shutdown problem in ubuntu 12.04 LTS

  - by sudeep

  I am using Ubuntu 12.04 LTS and I'm getting a serious bug: When I try to shutdown my system, my screen goes blank but my CPU fan keeps running, i.e. the processor is still working but I am not able to see anything on my screen. I need to power off my machine for a complete shutdown. I am using a desktop with an Intel P4 processor. I found a solution on the internet involving modifying the GRUB config file. But even after doing so I wasn't able to eliminate the issue.

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• C++ STL: Array vs Vector: Raw element accessing performance

  - by oh boy

  I'm building an interpreter and as I'm aiming for raw speed this time, every clock cycle matters for me in this (raw) case. Do you have any experience or information what of the both is faster: Vector or Array? All what matters is the speed I can access an element (opcode receiving), I don't care about inserting, allocation, sorting, etc. I'm going to lean myself out of the window now and say: Arrays are at least a bit faster than vectors in terms of accessing an element i. It seems really logical for me. With vectors you have all those security and controlling overhead which doesn't exist for arrays. (Why) Am I wrong? No, I can't ignore the performance difference - even if it is so small - I have already optimized and minimized every other part of the VM which executes the opcodes :)

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• how to get stl map to construct/destruct inserted object only once.

  - by Alberto Toglia

  I have found a very prejudicial fact about stl maps. For some reason I cant get objects being inserted in the map to get constructed/destructed only once. Example: struct MyObject{ MyObject(){ cout << "constructor" << endl; } ~MyObject(){ cout << "destructor" << endl; } }; int main() { std::map<int, MyObject> myObjectsMap; myObjectsMap[0] = MyObject(); return 0; } returns: constructor destructor destructor constructor destructor If I do: typedef std::pair<int, MyObject> MyObjectPair; myObjectsMap.insert( MyObjectPair(0,MyObject())); returns: constructor destructor destructor destructor I'm inserting Objects responsible for their own memory allocation, so when destructed they'll clean themselves up, being destructed several times is causing me some trouble.

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• Metro-style / iPhone apps development too demanding for newbie developers? [closed]

  - by linquize

  Both Metro-style and iPhone app require approval and publishing to app store. And they focus most on user interface and the quality of the software. Developers must deal with technical aspects, such as async programming (no UI blocking), no console program (must design a UI that cope with "Standard"), no CPU hungry (pause app if deactivated), need to study the permission matrix (not full access right), and more ... A newbie is not familiar with threading and synchronization. Do you thick they are too demanding for newbie developers? Can you give more examples how demanding it is?

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• C++ Singleton design pattern

  - by Artem Barger

  Recently I've bumped into a realization/implementation of the Singleton design pattern for C++. It has looked like this (I have adopted it from the real life example): // a lot of methods are omitted here class Singleton { public: static Singleton* getInstance( ); ~Singleton( ); private: Singleton( ); static Singleton* instance; }; From this declaration I can deduce that the instance field is initiated on the heap. That means there is a memory allocation. What is completely unclear for me is when exactly the memory is going to be deallocated? Or is there a bug and memory leak? It seems like there is a problem in the implementation. My main question is, how do I implement it in the right way?

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• Critical Patch Update for October 2013 Now Available

  - by LuciaC

  The  Critical Patch Update (CPU) for October 2013 was released on October 15, 2013.  Oracle strongly recommends applying the patches as soon as possible.The Critical Patch Update Advisory is the starting point for relevant information.  It includes a list of products affected, pointers to obtain the patches, a summary of the security vulnerabilities, and links to other important documents. E-Business Suite Releases 11i and 12 Reference: Oracle E-Business Suite Releases 11i and 12 Critical Patch Update Knowledge Document (October 2013) (Doc ID 1585639.1) Secure Configuration Guide for Oracle E-Business Suite Release 12 (Doc ID 403537.1) Secure Configuration Guide for Oracle E-Business Suite Release 11i (Doc ID 189367.1)

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• My ubuntu 11.10 gets weird lately

  - by The questioner

  I have quite a lot problems lately(about 2 weeks) running Ubuntu 11.10. First, flash playback in chrome hangs and lags all the time. While in Firefox is better, but still lags. Playing video files in the preinstalled Movie Player lags too. Second, I've turned automatic on and in some occasions, after I switched the computer on and successfully loaded the desktop, however, in just a minute or so, the screen just got black out and directed me back to the login page. I thinks there are bugs, please tell me how to correct those. Sysinfo: CPU: i5-2400 MB: GA H61M D2P B3 (no video card) Drive: Intel 320 40GB Thanks. p.s. should I upgrade to 12.04??

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• Retrieving Gtk::Widget's relative position: get_allocate() doesn't work

  - by a-v

  I need to retrieve the position of a Gtk::Widget relative to its parent, a Gtk::Table. Most sources (e.g. http://library.gnome.org/devel/gtk-faq/stable/x642.html) say that one needs to call Gtk::Widget::get_allocation(). However, the returned Gtk::Allocation object always contains x = -1, y = -1, width = 1, height = 1. I have to note that this happens before the Gtk::Table object is actually exposed and rendered. A call to show_all_children() or check_resize(), which I would expect to recalculate child widget geometry, doesn't help. What am I doing wrong? Thanks in advance.

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• Opening programs very slow on ubuntu 12.10

  - by Mislav Blaževic

  When I open any program for first time after boot, it loads VERY slowly (Doesn't matter how long after boot). For example, terminal takes 2-3 seconds, skype and firefox often take much longer. If I close it and open again, it loads in reasonable time (<1 second). I got Intel Core i5-2500K CPU @ 3.30GHz, so it shouldn't be hardware issue... What is causing this? Disk benchmark: Average read time: 115.5 MB/s (100 samples) Average write time: 98.7 MB/s (100 samples) Average access time: 11.79 msec (1000 samples)

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• Wobbly windows not working in compiz for 12.04

  - by f22christian

  I'm very new at Ubuntu and am still trying to figure everything out. I recently downloaded Compiz settings manager and enabled wobbly windows. Nothing. So I uninstalled it and re-installed it and still, nothing. I've ran all the updates and updated the graphics drivers and I still have nothing. I have a Sony Vaio with a Intel® Core™2 CPU T5500 @ 1.66GHz × 2 . Its a 2009 computer, so I think it should be able to work just fine. Please help! I'm not a "computer wiz", so you'll need to put it in simpler terms for me. And yes, I am I do have Unity 3D. Thanks!

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• Which version of Ubuntu is recommended for Samsung N270 notebook?

  - by Patu

  I have just installed 12.04 LTS 32bit because it was recommended but it seems slow, slightly slower than the EX family edition windows which came with the notebook and I used for 3 years.... so it makes me wonder if this is the correct version of Ubuntu for me. (or.. maybe I need to install the driver for my built in graphic card? or anything else.) specs: Samsung N270 notebook. Intel Atom cpu N270 @ 1.6GH X 2. 1GB RAM I am not sure the type of graphic card I just know that it is built in of Intel. Thank you guys for the help. Patu.

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