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

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. June 2015. 1. As organizations grow the amount of data storage capacity required to support it grows as well. Increased data retention requirements. Increased headcount. New applications. Adding on to an existing storage network should have minimal impact on the end user. Main Points. Cache concept. Hardware vs. software caches. When caches work and when they don’t. Spatial/temporal locality vs. . Zipf. workloads. Cache Replacement Policies. FIFO, MIN, LRU, LFU, Clock. 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. Hakim Weatherspoon. CS 3410, Spring 2011. Computer Science. Cornell University. P & H . Chapter. 5.4-5. Announcements. PA3 . available. Due . Tuesday, April 19. th. Work with . pairs. Be responsible with new knowledge. 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. (DRAM). Local secondary storage. (local disks). Larger, . slower, . and . cheaper . (per byte). storage. devices. Remote secondary storage. (distributed file systems, Web servers). Local disks hold files retrieved from disks on remote network servers.. 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. 11. th. Lecture, October 2, 2018. Today. Storage technologies and trends. Locality of reference. Caching in the memory hierarchy. Random-Access Memory (RAM). Key features. RAM . is traditionally packaged as a chip.. Prof. . Mikko. H. . Lipasti. University of Wisconsin-Madison. Lecture notes based on notes by . Jim Smith and Mark Hill. Updated by Mikko Lipasti. Readings. Read on your own:. Review: Shen & Lipasti Chapter 3. 2017. Instructor:. . Ruth Anderson. Teaching Assistants:. Dylan Johnson. Kevin Bi. Linxing. Preston Jiang. Cody . Ohlsen. Yufang. Sun. Joshua Curtis. Administrivia. Midterms Graded. If you did not receive an email from . 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. CSE351 Winter 2013. Roadmap. 2. car *c = malloc(sizeof(car));. c->miles = 100;. c->gals = 17;. float mpg = get_mpg(c);. free(c);. Car c = new Car();. c.setMiles(100);. c.setGals(17);. float mpg =.