Design and Evaluation think of an IV idea (that fulfils a need) preliminary investigation Copyright By PowCoder代写 加微信 powcoder Iterative design (re) design the visualisation tool/ method create (a physical representation of) the tool/ method identify appropriate changes to be made to the design define tasks for participants to do ask participants to perform the […]
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Carnegie Mellon Dynamic Memory Allocation: Advanced Concepts 15-213/18-213/15-513: Introduction to Computer Systems 16th Lecture, June 23, 2020 Bryant and O’Hallaron, Computer Systems: A Programmer’s Perspective, Third Edition 1 Carnegie Mellon Review: Dynamic Memory Allocation Memory invisible to user code %rsp (stack pointer) Kernel virtual memory User stack (created at runtime) Memory-mapped region for shared libraries
程序代写代做代考 kernel graph C Java c++ algorithm data structure Carnegie Mellon Read More »
Carnegie Mellon Malloc Bootcamp Adithi, Anja, Eugene June 28, 2020 Carnegie Mellon Agenda ▪ Conceptual Overview ▪ Explicit List ▪ Segregated list ▪ Splitting, coalescing ▪ Hints on hints ▪ Advanced debugging with GDB ▪ Fun GDB tricks ▪ Writing a good heap checker ▪ Appendix Carnegie Mellon Conceptual Outline Carnegie Mellon Dynamic Memory Allocation
程序代写代做代考 assembly go algorithm C data structure Carnegie Mellon Read More »
Carnegie Mellon C Boot Camp 16 June 2020 Eugene Joshua Carnegie Mellon Agenda ■ C Basics ■ Debugging Tools / Demo ■ Appendix C Standard Library getopt stdio.h stdlib.h string.h Carnegie Mellon C Basics Handout ssh @shark.ics.cs.cmu.edu cd ~/private wget http://cs.cmu.edu/~213/activities/cbootcamp.tar.gz tar -xvpf cbootcamp.tar.gz cd cbootcamp make ■ Contains useful, self-contained C examples ■ Slides
程序代写代做代考 assembly graph C data structure cache Carnegie Mellon Read More »
Introduction to Indexes File organizations Introduction to indexes Consider a simple SQL query Assume data is stored on HDD to make access table efficient ▪ Store the table on adjacent blocks ▪ On the same cylinder, then ▪ Adjacent cylinders ▪ Use RAID But many queries include WHERE clauses ▪
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Skiplists, Bitmap Indices, kd Trees Skiplist Bitmap Indexes kd Trees 5.1 B and B+ trees are the most commonly used ordered DBMS index structure ▪ Tree nodes are mapped to disk pages In-memory DBs allows the use of other index structures ▪ That do not have to be optimized for
Carnegie Mellon Code Optimization 15-213/18-213/15-513: Introduction to Computer Systems 13th Lecture, June 17, 2020 Bryant and O’Hallaron, Computer Systems: A Programmer’s Perspective, Third Edition 1 Carnegie Mellon Rear Admiral Grace Hopper ▪ Invented first compiler in 1951 (technically it was a linker) ▪ Coined “compiler” (and “bug”) ▪ Compiled for Harvard Mark I ▪
Record and Page Format Files John Edgar 2 4.1 A database is made up of tables ▪ A table is generally represented by a single file Tables are collections of records ▪ A record describes an entity or relationship ▪ And is defined by its attribute values Attributes also referred
程序代写代做代考 flex database data structure Record and Page Format Files Read More »
And SSDs Buffer management Solid State Drives John Edgar 2 5.1 Main memory is partitioned into a collection of frames called the buffer pool ▪ The buffer manager is responsible for bringing pages from disk to main memory as required ▪ Pages are mapped to frames ▪ Processes inform the buffer manager
程序代写代做代考 cache algorithm database data structure clock And SSDs Read More »
Carnegie Mellon Bryant and O’Hallaron, Computer Systems: A Programmer’s Perspective, Third Edition 1 Carnegie Mellon Course Overview 15-213/18-213/15-513: Introduction to Computer Systems 1st Lecture, May 19, 2020 Instructors: Brian Railing The course that gives CMU its “Zip”! Bryant and O’Hallaron, Computer Systems: A Programmer’s Perspective, Third Edition 2 Carnegie Mellon Overview Big Picture ▪