... complexity On a shared eliminate Because memory multiprocessor, these problems the kernel from the path of cross-address address spaces can share memory directly, have space shared a solution: ... the sharedmemory channel is ensured by ACM Transactions on Computer Systems, Vol 9, No 2, May 1991 User-Level Interprocess a combination statically) correctness Communication for SharedMemory ... call while still guaranteeing safe interaction can be passed using shared between mutually suspicious memory subsys- tems Sharedmemory message of client-server interactions still overload one another,...
... the memorysize of each process, because that wouldn’t account for the sharedmemory On the other hand, we cannot just subtract the sharedmemorysize from the total size to get the real memory- usage ... A’s memory segment unshared with parent process Process B’s memory segment unshared with parent process Parent process’ memory segment shared with Process A Parent process’ memory segment shared ... "Total shared memory: ", GTop->new->mem->share, "\n"; Calculating Real Memory Usage We have shown how to measure the size of the process’s shared memory, but we still want to know what the real memory...
... CSAs A shared heap is used as a m e d i u m of communication between CSAs, and it is realized on a sharedmemory W h e n a CSA completes a computation on TFSs, it writes the result on a shared ... a series of experiments on a shared- memory parallel machine, SUN Ultra Enterprise 10000 consisting of 64 nodes (each node is a 250 MHz UltraSparc) and GByte sharedmemory The corpus consists of ... u l t a n e o u s C o p y i n g An identical TFS on a shared heap can be copied by several CSAs simultaneouslv This is due to our sharedmemory mecilanism and the property of LiAM that copying...
... As pointed out in [50], there are three main architectures for parallel database systems: shared disk, shared nothing, and shared everything Each of these three architectures has dierent characteristics ... the shared nothing architecture Section 1.2.1 rst introduces the shared nothing architecture and describes parallel query execution in a shared nothing system Then, Section 1.2.2 discusses the shared ... parallel query optimization 1.2.1 Shared Nothing Systems The Shared Nothing Architecture With a shared nothing system, each processor owns a portion of the database and only that portion may...
... limitations of the available memory These solutions range from traditional memory hierarchies to intelligent memory systems Each solution attempts to reduce the impact of poor memory performance by ... targets The lower bound on memory capacity is given by the memory requirements of targeted applications while die area and memory performance limit the maximum amount of memory Higher capacity RAMs ... over-constraining the memory capacity limits the flexibility of the array as new applications emerge Hence, the scalability of the memory module design is important, allowing the memorysize to be chosen...
... on a sharedmemory Efficiency of Embedded Explicit Pseudo Two-Step RKN Methods 97 parallel computer is due to the fact that such a computer can consist of several processors sharing a common memory ... Variable Stepsize Embedded EPTRKN Methods The EPTRKN methods have been recently introduced and investigated in [9, 14] For an implementation with stepsize control, we consider variable stepsize embedded ... efficient than the codes DOPRI5 and DOP853 for solving expensive nonstiff first-order problems on a sharedmemory parallel computer We have also obtained a similar performance of a parallel implementation...
... of shared- memory programs in the current multi-core era, new specification and verification methodologies are needed for ensuring the reliability of shared- memory concurrent programs 1.2 Shared- Memory ... Introduction 1.1 Formal Methods 1.2 Shared- Memory Concurrency in Multi-core Era 1.3 Verification of Shared- Memory Concurrent Programs 1.4 Objective and Contributions ... reliability of shared- memory concurrent programs, they mainly focus on partial correctness and data-race freedom, and often ignore the verification of synchronization properties In shared- memory concurrent...
... trình Các trạng thái tiến trình Cấu trúc tiến trình Các kiểu giao tiếp tiến trình Sharedmemory cần thiết sharedmemory giao tiếp tiến trình Company Logo Tạo phân đoạn nhớ chung Một tiến trình ... Share memory •Viết chạy chương trình với toán đơn giản +, -, (, ) 2.Hướng phát triển: Đồ án dừng lại phạm vi tìm hiểu giao tiếp tiến trình chế Share memory viết chương trình mô đơn giản Share memory ... sử dụng hàm shmget() Cú pháp: #include #include int shmget(key_t key, size_ t size, int shmflg); Hàm shmget() tạo vùng nhớ chia sẻ truy cập đến vùng nhớ chia sẻ tồn Company...
... Tuning database configuration parameters with iTuned VLDB, 2:1246–1257, August 2009 [20] S Finkelstein, M Schkolnick, and P Tiberio Physical database design for relational databases ACM Trans Database ... M L Kersten Generic database cost models for hierarchical memory systems In VLDB, pages 191–202, 2002 [30] M Mehta and D J DeWitt Data placement in shared- nothing parallel database systems The ... enterprise OLTP databases to balance these conflicting goals In the next section, we describe how we solve this problem AUTOMATIC DATABASE DESIGN Horticulture is an automatic database design tool...
... largest sharedmemory segment that can be created is 1024 MB The size of the sharedmemory segment required for a shared data store TimesTen Installation 27 is larger than the requested data store size ... that the largest sharedmemory segment that can be created is 1024 MB The size of the sharedmemory segment required for a data store is larger than the data store size permanent size Set this value ... existing kernel parameter settings, log in as root and use: # /sbin/sysctl -a Sharedmemory To increase the sharedmemorysize to 2048 MB, for example, as root, edit the /etc/sysctl.conf file by adding...
... size of database and the size of database buffer cache of the server were set to 450 MBytes and 500 MBytes, respectively Note that this setting allows the database server to cache the entire database ... 16 32 48 64 80 Cluster Size in Merge Step (KB) 96 112 128 (a) Varying cluster size (buffer cache size fixed at MB) Buffer Size (MB) 11 13 15 (b) Varying buffer size (cluster size fixed at 64 KB for ... the effect of cluster size on sort performance, we ran the sort query mentioned above on a commercial database server with a varying size of cluster The buffer cache size of the database server was...
... for specifying different SGA component sizes, such as SHARED_ POOL _SIZE, DB_CACHE _SIZE, LARGE_POOL _SIZE, and JAVA_POOL _SIZE The task of manually adjusting the sizes of individual SGA components could ... SHAREDMEMORY MANAGEMENT To resolve these challenges, Oracle Database 10g introduces Automatic SharedMemory Management In Oracle Database 10g, DBAs can just specify the total amount of SGA memory ... follows: Actual Shared Pool Size = 64M The Self-Managing Database: Automatic SGA Memory Management Page Actual buffer cache size = 128M Actual java pool size = 60M Actual Large Pool Size = 4M The...
... runs with a MySQL database server on a Linux platform 40 under different configuration, a combination of the database size, system buffer size and number of simulated users When the database server ... Performance for a PCM-as-a-Main -Memory -Database viii 57 Chapter Introduction Non-volatile Memory (NVM) has a day-to-day impact in our life NVM known as flash memory is there with us to store ... speed CPU CACHE CACHE CACHE DRAM PCM (a) PCM Main Memory CPU Main Memory Main Memory CPU SSD/HARD DISK PCM DRAM M SSD/HARD DISK (b) (c) Figure 2.2: Memory organization with PCM than SSD And PCM’s...
... penalizes individual queries Database Cracking The drawbacks of offline and online analysis motivate adaptive indexing, the prime example of which is database cracking [14] Database cracking pioneered ... Weikum Rethinking database system architecture: Towards a self-tuning RISC-style database system In VLDB, pages 1–10, 2000 [8] S J Finkelstein, M Schkolnick, and P Tiberio Physical database design ... physical database design In VLDB, pages 1087–1097, 2004 CONCLUSIONS This paper introduced Stochastic Database Cracking, a proposal that solves the workload robustness deficiency inherent in Database...
... cài máy hành bạn), chọn database tên “HumanResourceDB” (database tạo sẵn bước 2) -> nhấn nút OK -> Next, làm theo dẫn wizard, xem hình bên dưới: • Hình 5: tạo kết nối với database Các chủ đề tương ... DataTable data = ReadDataFromExcelFile(); // Import liệu đọc vào database ImportIntoDatabase(data); // Lấy hết liệu import từ database hiển thị lên gridView ShowData(); } private bool ValidInput() ... Hình 3: Database để lưu thông tin import Lưu ý: bạn dụng SQL Server 2000 để thao tác (không thiết SQL Server...
... dụng Database- Specific Integrity Rules nghiêm chỉnh database bị hư không dùng Microsoft Access Database Management System (MSAccess DBMS) Microsoft Access Database Management System gồm có Database ... mà bạn muốn dùng để nhét vào Access database mở: Database Server số ý niệm Dù Jet Database Engine relational database tốt hiệu năng, thuộc loại File Based database, tức thụ động, không chạy phải ... Table Titles có Primary Key ISBN Relational Database Một database có nhiều tables hổ trợ liên hệ, one-to-many, gọi Relational Database Khi thiết kế database, ta tìm cách đặt liệu từ giới thật...
... mạch chủ dạng cố định dạng có nhiều chips nhỏ Có hai loại: SIMM – Single Inline Memory Modules DIMM Double Inline Memory Modules) SIMM DIMM dạng tháo lắp, thay khác có dung lượng lớn hay nhỏ Mặc ... thiết bị nâng cấp Không giống EPROM, chips EEPROM (Electrically Erasable Programmable Read-Only Memory) xoá cách dùng mức điện cao bình thường thay cho ánh sáng cực tím Khi chương trình BIOS (hay ... chips lưu lại liệu máy tính tắt nguồn; vậy, thông tin lưu trữ vĩnh cửu II RAM : RAM – Random Access Memory – nhớ truy xuất ngẫu nhiên; nơi lưu trữ hệ điều hành, ứng dụng liệu sử dụng CPU truy xuất...
... a) Main memory capacity b) Data transfer capacity between an internal device (processor and main memory) and an I/O device c) Data transfer capacity between a processor and the main memory d) ... world Q22 When comparing a relational database with an object-oriented database, which of the following statements correctly describes the object-oriented database? a) It can express real world ... defines a repository in software development? -5- a) It is a database of software components provided to support development b) It is a database that centrally manages design information and program...