automatic memory management garbage collection

Ngày tải lên: 17/04/2014, 09:15

... Database: Automatic SGA Memory Management Page The Self-Managing Database: Automatic SGA Memory Management INTRODUCTION One of the key self -management enhancements in the Oracle Database 10g is Automatic ... fact that no out of memory errors will be generated unless the system has truly run out of memory ENABLING AUTOMATIC SHARED MEMORY MANAGEMENT The Automatic Shared Memory Management feature can ... Memory Management screen The Self-Managing Database: Automatic SGA Memory Management Page Fig 2: Enabling Automatic Shared Memory Management using Enterprise Manager While enabling the Automatic...

Ngày tải lên: 07/04/2014, 15:51

... Class  Memory Management – Overview – Heap management – Memory- mapped files – Dynamic link libraries CS222 - Systems Programming 2/23/2008 Today’s Class  Memory Management – Overview – Heap management ... 2/23/2008 Memory- mapped Files  Memory- mapped file functionality – Map virtual memory space directly to normal files  Advantages – No need to perform direct file I/O – Data structures created in memory ... used for allocating a block of memory from a heap – dwFlags • HEAP_GENERATE_EXCEPTIONS • HEAP_NO_SERIALIZE • HEAP_ZERO _MEMORY  Use HeapFree function to deallocate memory LPVOID HeapAlloc( HANDLE...

Ngày tải lên: 12/09/2012, 14:38

... KTMT 27 1.Cơ chế phân trang (tt) frame number page number 0 1 2 3 logical memory page page page page table page physical memory Khoa KTMT 28 1.Cơ chế phân trang (tt) A) Chuyển đổi đòa paging – ... Associative lookup = 20 Memory access = 100 Hit ratio = 0.8 EAT = (100 + 20) × 0.8 + (200 + 20) × 0.2 = 1.2 × 100 + 20 = 140 Khoa KTMT Ví dụ     Associative lookup = 20 Memory access = 100 Hit ... logical address space function sqrt physical memory space Khoa KTMT 49 Phần cứng hỗ trợ phân đoạn segment table s limit base CPU s d < yes + physical memory no trap; addressing error Khoa KTMT...

Ngày tải lên: 12/09/2012, 15:43

... fragmentation • memory leaks • valgrind –tool=memcheck, checks for memory leaks Garbage collection • C does not have any garbage collectors • Implementations available • Types: • Mark and sweep garbage ... variable (b) wait for (item>0) signal from producer (mutex unlocked automatically) (c) wake up when signalled (mutex locked again automatically), unlock mutex and proceed Producer: (1) produce something ... with the mutex already locked otherwise behavior undefined • automatically releases mutex • upon successful return, the mutex will be automatically locked again int pthread_cond_broadcast(pthread_cond_t...

Ngày tải lên: 25/04/2013, 08:07

... illustration Memory Physical Memory (RAM) and Swap Space All computers have central memory, or system memory, which has a sequence of instructions (a program) and data related to the program This memory ... controlled directly by the processor in conjunction with the Memory Management Unit (MMU) and is called physical memory, or random access memory (RAM) Many processes are held simultaneously in RAM, ... the disk which is limited RAM plus swap space constitutes virtual memory which is the maximum space that processes can use Virtual memory has a much shorter access time than accessing something...

Ngày tải lên: 02/10/2013, 09:20

... available memory In C we have to clean up manually, and forgetting to this is a little too common, resulting in what we call memory leaks In Java, however, an automatic service called the garbage ... System.out.println("x = "+x); } } } 6250CH15.qxd 2/22/06 5:00 PM Page 73 LESSON 15 ■ THREADS, DAEMONS, AND GARBAGE COLLECTION ■ You will probably have noticed that we are instantiating a new Thread class in ... retrieve the priority 73 6250CH15.qxd 74 2/22/06 5:00 PM Page 74 LESSON 15 ■ THREADS, DAEMONS, AND GARBAGE COLLECTION Basic Related Threads Have a look at the next two classes What I’ve done is let different...

Ngày tải lên: 05/10/2013, 10:20

... Contents About Memory Management At a Glance Good Practices Prevent Memory- Related Problems Use Analysis Tools to Debug Memory Problems Memory Management Policy Basic Memory Management Rules ... if the memory management semantics for the instance variable change) 2012-07-17 | © 2012 Apple Inc All Rights Reserved 13 Practical Memory Management Use Accessor Methods to Make Memory Management ... objects in memory than you actually need At a Glance Objective-C provides two methods of application memory management 2012-07-17 | © 2012 Apple Inc All Rights Reserved About Memory Management...

Ngày tải lên: 21/02/2014, 12:20

... 2/23/2008 Today’s Class  Memory management – – – – Overview Heap management Memory- mapped files Dynamic link libraries CS222 - Systems Programming 2/23/2008 Memory Management I A Designated ... 16 2/23/2008 Windows Memory Management C Library Windows Program Heap API MMF API Virtual Memory API Windows Kernel with Virtual Memory Manager Disk & File System Physical Memory CS222 - Systems ... GetExceptionCode()); } /* free allocated memory */ HeapDestroy(hHeap); CS222 - Systems Programming 27 2/23/2008 Review  Memory management – – – – Overview Heap management Memory- mapped files Dynamic link...

Ngày tải lên: 15/03/2014, 09:20

... Class  Memory Management – Overview – Heap management – Memory- mapped files – Dynamic link libraries CS222 - Systems Programming 2/23/2008 Today’s Class  Memory Management – Overview – Heap management ... 2/23/2008 Memory- mapped Files  Memory- mapped file functionality – Map virtual memory space directly to normal files  Advantages – No need to perform direct file I/O – Data structures created in memory ... used for allocating a block of memory from a heap – dwFlags • HEAP_GENERATE_EXCEPTIONS • HEAP_NO_SERIALIZE • HEAP_ZERO _MEMORY  Use HeapFree function to deallocate memory LPVOID HeapAlloc( HANDLE...

Ngày tải lên: 15/03/2014, 09:20

... memory management Obstacks Garbage Collection in C A Critique of Custom Memory Allocation Bibliography 21 Garbage Collection Garbage collection is the automatic reclamation of memory that is no longer ... management Obstacks Garbage Collection in C A Critique of Custom Memory Allocation Bibliography Problems of Memory Allocation Fragmentation Not being able to reuse free memory Free memory is split ... Region-based memory management Obstacks Garbage Collection in C A Critique of Custom Memory Allocation Bibliography 16 Region-based Memory Allocation Get a large chunk of memory Allocate small pieces out...

Ngày tải lên: 19/03/2014, 13:40

... “Overview” Garbage Collection  Objects are created using new, but there is no corresponding delete operation to reclaim the memory used by an object  The Java virtual machine used garbage collection ... remain in memory, and to free up memory by deallocating objects that are no longer reachable from references in executing code  Garbage is collected without your intervention, but collecting garbage ... collecting garbage still takes time  Garbage collection is not a guarantee that memory will always be available for new objects It solves many but not all the memory allocation problems Nested Classes...

Ngày tải lên: 24/03/2014, 03:20

Ngày tải lên: 10/04/2014, 09:22

... Life Before Automatic Reference Counting OSX Lion and iOS5 now offer an application memory management mechanism called Automatic Reference Counting (ARC) In short, ARC makes memory management ... In many cases in Objective-C, we can rephrase "memory management" as "reference counting." Memory management means that a programmer allocates a memory area when the program needs it and frees ... Before Automatic Reference Counting Reference Count = Address of a memory block The memory block is reachable! Reference Count = Address of a memory block Reference Count = Address of a memory...

Ngày tải lên: 24/04/2014, 10:04

Ngày tải lên: 13/05/2014, 00:29

... machine is famous for its garbage collection facilities In this book I explore several automatic memory management techniques and also provide a couple of concrete garbage collection implementations ... Architecture 194 Java Memory Management 196 Memory Management: The Three-layer Cake 202 References 204 Chapter Manual Memory Management 207 ... 156 Manual Memory Management 157 Example: C Standard Library Calls 158 Automatic Memory Management 160 Example: The BDW Conservative Garbage Collector ...

Ngày tải lên: 06/07/2014, 15:19

... niệm Garbage Collection (GC- dọn rác) Biến đếm GC Mark-Sweep Collection - [McCarthy 1960] .8 Mark-Compact Collection (Nén sau đánh dấu) 10 Copying Garbage Collection ... Implicit Collection .13 LỜI KẾT .13 TÀI LIỆU THAM KHẢO 14 Tiểu luận: Nguyên lý ngôn ngữ lập trình Nguyễn Mạnh Hà – CB111398 - SPKTTH Các khái niệm Garbage Collection ... vùng nhớ (hay gọi rò rỉ nhớ – memory leak) Vì thế, yêu cầu bắt buộc sau sử dụng xong vùng nhớ cấp phát phải thu hồi Trong NET (cũng Java) có khái niệm Bộ dọn rác (Garbage Collector) Đây tiến trình...

Ngày tải lên: 10/08/2014, 22:51

... Memory Management • Ideally programmers want memory that is – large – fast – non volatile • Memory hierarchy – small amount of fast, expensive memory – cache – some medium-speed, ... cache – some medium-speed, medium price main memory – gigabytes of slow, cheap disk storage • Memory manager handles the memory hierarchy Basic Memory Management Monoprogramming without Swapping ... larger than limit value is an error Swapping (1) Memory allocation changes as – processes come into memory – leave memory Shaded regions are unused memory Swapping (2) • Allocating space for growing...

Ngày tải lên: 17/10/2014, 07:22

... Memory Management • Ideally programmers want memory that is – large – fast – non volatile • Memory hierarchy – small amount of fast, expensive memory – cache – some medium-speed, ... cache – some medium-speed, medium price main memory – gigabytes of slow, cheap disk storage • Memory manager handles the memory hierarchy Basic Memory Management Monoprogramming without Swapping ... larger than limit value is an error Swapping (1) Memory allocation changes as – processes come into memory – leave memory Shaded regions are unused memory Swapping (2) • Allocating space for growing...

Ngày tải lên: 18/10/2014, 15:30