PPT-Virtual Memory Use main memory as a “cache” for secondary (disk) storage

Managed jointly by CPU hardware and the operating system OS Programs share main memory Each gets a private virtual address space holding its frequently used code and data Protected from other programs. Definitions. Cache. Copy of data that is faster to access than the original. Hit: if cache has copy. Miss: if cache does not have copy. Cache block. Unit of cache storage (multiple memory locations). Prince Sultan College For Woman. Dept. of Computer & Information Sciences. CS 251. Introduction to Computer Organization . & Assembly Language. Lecture 8. (Computer System Organization). Secondary Memory. Definitions. Cache. Copy of data that is faster to access than the original. Hit: if cache has copy. Miss: if cache does not have copy. Cache block. Unit of cache storage (multiple memory locations). Term. Abbreviation. Approximate Memory Size. Kilobyte. KB or K. =1000 bytes (actual size is 1024 bytes). Megabyte. MB. =1 million bytes. Gigabyte. GB. =1 billion bytes. Terabyte. TB. =1 trillion bytes. 16.1 Introduction. Databases typically stored on magnetic disks. Accessed using physical database file structures. Storage hierarchy. Primary storage. CPU main memory, cache memory. Secondary storage. Lecture for CPSC 5155. Edward Bosworth, Ph.D.. Computer Science Department. Columbus State University. The Simple View of Memory. The simplest view of memory is . that presented . at the ISA (Instruction Set Architecture) level. At this level, memory is a . Slide. . Source: Bryant@cmu. Topics. Address translation. Accelerating translation with TLBs. class12.ppt. VM Address Translation: Hit. Processor. Hardware. Addr Trans. Mechanism. Main. Memory. a. a'. Dr. . Nizamettin AYDIN. naydin. @. yildiz. .edu.tr. nizamettinaydin@gmail.com. http://. www.yildiz. .edu.tr/~. naydin. 1. Virtual . Memory. 2. Cache memory enhances performance by providing faster memory access speed.. Virtual Memory Use main memory as a “cache” for secondary (disk) storage Managed jointly by CPU hardware and the operating system (OS) Programs share main memory Each gets a private virtual address space holding its frequently used code and data Virtual Memory 2 Hakim Weatherspoon CS 3410, Spring 2012 Computer Science Cornell University P & H Chapter 5.4 Goals for Today Virtual Memory Address Translation Pages, page tables, and memory mgmt Lecture 12: Caches. Life without caches. You decide that you want to learn more about computer systems than is covered in this course. The library contains all the books you could possibly want, but you don't like to study in libraries, you prefer to study at home.. 15-213: Introduction to Computer Systems . 16. th. . Lecture, Oct. . 22. , 2013. Instructors:. . Randy Bryant, Dave . O’Hallaron. , and Greg . Kesden. Today . Address spaces. VM as a tool for caching. Instructor:. . Justin Hsia. Teaching Assistants:. Lucas Wotton. Michael Zhang. Parker . DeWilde. Ryan Wong. Sam . Gehman. Sam Wolfson. Savanna Yee. Vinny . Palaniappan. http://rebrn.com/re/bad-chrome-1162082. The basic objective of a computer system is to increase the speed of computation. Likewise, the basic objective of a memory system is to provide fast, uninterrupted access by the processor to the memory such that, the processor can operate at its expected speed. .