memory

问题 This is from the book: Understanding and Using C Pointers If memory is re‐ peatedly allocated and then lost, then the program may terminate when more memory is needed but malloc cannot allocate it because it ran out of memory. In extreme cases, the operating system may crash. This is illustrated in the following simple example: char *chunk; while (1) { chunk = (char*) malloc(1000000); printf("Allocating\n"); } The variable chunk is assigned memory from the heap. However, this memory is not

问题 This is from the book: Understanding and Using C Pointers If memory is re‐ peatedly allocated and then lost, then the program may terminate when more memory is needed but malloc cannot allocate it because it ran out of memory. In extreme cases, the operating system may crash. This is illustrated in the following simple example: char *chunk; while (1) { chunk = (char*) malloc(1000000); printf("Allocating\n"); } The variable chunk is assigned memory from the heap. However, this memory is not

问题 I am developing a 32 bit application and got out of memory error. And I noticed that my Visual Studio and a plugin (other apps too) used too much memory which is around 4 or 5 GB. So I suspected that these program use up all the memory addresses where my program is able to find free memory. I suppose that 32 bit can only use the first 4 GB, other memory it can not use at all. I don't know if I am correct with this, other wise I will look for other answers, like I have bug in my code. 回答1:

问题 I am getting the above error whenever I test on an emulator, but not any devices I have tested on. Can anyone suggest why this might happen ? 回答1: You are probably testing on high profile devices that might have 32Mb or more heap size memory. The emulator could be using 24Mb and that's the reason is crashing. Go to the AVD (Android Virtual Device) editor, and add "Max VM application heap size" to your virtual device hardware properties. Set that value to 32Mb and reboot your emulator. That

问题 I am getting the above error whenever I test on an emulator, but not any devices I have tested on. Can anyone suggest why this might happen ? 回答1: You are probably testing on high profile devices that might have 32Mb or more heap size memory. The emulator could be using 24Mb and that's the reason is crashing. Go to the AVD (Android Virtual Device) editor, and add "Max VM application heap size" to your virtual device hardware properties. Set that value to 32Mb and reboot your emulator. That

问题 I would like to perform pretraining of neural network using autoencoders implemented in TensorFlow. I am able to run whole network. (Using TF or Keras). the whole graph fits into GPU memory so that's fine. Problem occurs when I create more graphs (autoencoders). GPU run out of memory very quickly. Right now I have example where building second level autoencoder causes GPU out of mem. exception. So what is happening: I have implementation of autoencoders which has session as it's attribute, so

问题 When we need to release an object,where to do it, either at the dealloc method or in the ViewDidUnload for a viewController? which would be better? I think that viewDidUnload would do better, because once the view controller is unloaded the objects would be released. And in the dealloc case, from the documentation When an application terminates, objects may not be sent a dealloc message. Because the process’s memory is automatically cleared on exit, it is more efficient simply to allow the

问题 This is on Visual Studio 2008 on a dual-core, 32 bit Vista machine. In the debug code this runs fine, but in Release mode this bombs: void getFromDB(vector<string>& dates) { ... sql::Resultset res = stmt->executeQuery("SELECT FROM ..."); while (res->next()) { string date = res->getString("date"); dates.push_back(date); } // <<< crashing here (line 56) delete res; } The MySQL C++ connector has this method in it's ResultSet: virtual std::string getString(const std::string& columnLabel) const =

问题 Environment: Windows 8 64 bit, Windows 2008 server 64 bit Visual Studio (professional) 2012 64 bits list L; //I have 1000s of large CMyObject in my program that I cache, which is shared by different threads in my windows service program. For our SaaS middleware product, we cache in memory 1000s of large C++ objects (read only const objects, each about 4MB in size), which runs the system out of memory. Can we associate a disk file (or some other persistent mechanism that is OS managed) to our