Gm theory
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Game Theory was used to analyze the feasibility of the 1980s Strategic Defense Initiative (SDI) or "Star Wars" program. The analysis found a 1/3 probability that the defensive system ("Blue") could defend against attacks. Game Theory was founded by mathematician John von Neumann, who was born in Budapest in 1903 and died in Washington D.C. in 1957.
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The document discusses memory hierarchy and caching techniques. It begins by explaining the need for a memory hierarchy due to differing access times of memory technologies like SRAM, DRAM, and disk. It then covers concepts like cache hits, misses, block size, direct mapping, set associativity, compulsory misses, capacity misses, and conflict misses. It also discusses techniques for improving cache performance like multi-level caches, write buffers, increasing associativity, and interleaving memory banks.
How analysis services caching works
This document discusses how Analysis Services caching works and provides strategies for warming the Storage Engine cache and Formula Engine cache. It explains that the Storage Engine handles data retrieval from disk while the Formula Engine determines which data is needed for queries. Caching can improve performance but requires understanding when Analysis Services is unable to cache data. The document recommends using the CREATE CACHE statement and running regular queries to pre-populate the caches with commonly used data. Memory usage must be monitored when warming caches to avoid exceeding limits. Automating cache warming after processing is suggested to not interfere with user queries.
Hardware managed cache
The document proposes optimizing DRAM caches for latency rather than hit rate. It summarizes previous work on DRAM caches like Loh-Hill Cache that treated DRAM cache similarly to SRAM cache. This led to high latency and low bandwidth utilization.
The document introduces the Alloy Cache design which avoids tag serialization and keeps tags and data in the same DRAM row for lower latency. It also proposes a simple Memory Access Predictor to use either serial or parallel access models depending on the prediction to reduce latency and bandwidth usage. Simulation results show the Alloy Cache with predictor outperforms previous designs like SRAM-Tags.
Data structures and algorithms
The document discusses abstract data types (ADTs), specifically queues. It defines a queue as a linear collection where elements are added to one end and removed from the other end, following a first-in, first-out (FIFO) approach. The key queue operations are enqueue, which adds an element, and dequeue, which removes the element that has been in the queue longest. Queues can be implemented using arrays or linked lists. Array implementations use head and tail pointers to track the start and end of the queue.
Cobol, lisp, and python
The document provides information on three programming languages: COBOL, LISP, and Python. COBOL was released in 1959 and was used for 80% of business transactions due to its reliability. LISP was the second high-level language created in 1958 and introduced innovations like garbage collection and recursion using linked lists. Python was developed in the 1990s and prioritizes readability through features like whitespace and a simple grammar.
Abstract data types
This document discusses abstract data types (ADTs) and their implementation in various programming languages. It covers the key concepts of ADTs including data abstraction, encapsulation, information hiding, and defining the public interface separately from the private implementation. It provides examples of ADTs implemented using modules in Modula-2, packages in Ada, classes in C++, generics in Java and C#, and classes in Ruby. Parameterized and encapsulation constructs are also discussed as techniques for implementing and organizing ADTs.
Optimizing shared caches in chip multiprocessors
Chip multiprocessors, which place multiple processors on a single chip, have become common in modern processors. There are different approaches to managing caches in chip multiprocessors, including private caches for each processor or shared caches. The optimal approach balances factors like interconnect traffic, duplication of data, load balancing, and cache hit rates.
Abstraction file
This document discusses the key concepts of object-oriented programming including abstraction, encapsulation, classes and objects. It defines abstraction as focusing on the essential characteristics of an object and hiding unnecessary details. Encapsulation hides the internal representation of an object within its class. A class defines both the data and behaviors of an object through its public interface and private implementation. Objects are instantiations of classes that come to life through constructors and die through destructors while maintaining data integrity.
Object model
The document discusses abstraction, which is a fundamental concept of object-oriented design. Abstraction involves focusing on an object's essential characteristics and behavior while hiding implementation details. There are different types of abstractions from most useful to least useful. Effective abstractions model real-world entities and provide well-defined interfaces through contracts, preconditions, and postconditions. Both static and dynamic properties of objects must be considered.
Object oriented analysis
Object-oriented analysis and design (OOAD) emphasizes investigating requirements rather than solutions, and conceptual solutions that fulfill requirements rather than implementations. OOAD focuses on identifying domain concepts and defining software objects and how they collaborate. The document then discusses OO concepts like encapsulation, abstraction, inheritance, and polymorphism and how classes and objects are used in object-oriented programming. It provides an overview of the course structure and evaluation criteria.
Abstract class
Abstract classes and interfaces allow for abstraction and polymorphism in object-oriented design. Abstract classes can contain both abstract and concrete methods, while interfaces only contain abstract methods. Abstract classes are used to provide a common definition for subclasses through inheritance, while interfaces define a contract for implementing classes to follow. Both increase complexity, so their use should provide clear benefits to functionality.
Concurrency with java
This document discusses various programming paradigms and concurrency concepts in Java. It covers single process and multi-process programming, as well as multi-core and multi-threaded programming. Key concepts discussed include processes, threads, synchronization, deadlocks, and high-level concurrency objects like locks, executors, and concurrent collections. The document provides examples of implementing and managing threads, as well as communicating between threads using techniques like interrupts, joins, and guarded blocks.
Inheritance
This document discusses inheritance in object-oriented programming. It explains that inheritance allows a subclass to inherit attributes and behaviors from a superclass, extending the superclass. This allows for code reuse and the establishment of class hierarchies. The document provides an example of a BankAccount superclass and SavingsAccount subclass, demonstrating how the subclass inherits methods like deposit() and withdraw() from the superclass while adding its own method, addInterest(). It also discusses polymorphism and access control as related concepts.
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Gm theory
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Editor's Notes
- Str.29-30
- Play only audio recording from him?