https://en.wikipedia.org/wiki/Amdah's_law Amdahl's law is often used in parallel computing to predict the theoretical speedup when using multiple processors. For example, if a program needs 20 hours using a single processor core, and a particular par…

BACKGROUND Generally, the concept of virtualization in information processing systems allows multiple instances of one or more operating systems (each, an "OS") to run on a single information processing system, even though each OS is designed to…

CXPACKET 等待类型是SQL Server 并发执行一个query时产生的.在run一个big query时,SQL Server充分利用系统的所有资源(CPU,Memory,IO),在最短时间内返回结果.在拥有多个Processor的系统中,如果将一个Query的Wordload 分布在多个Processor上,那么每个Processor只处理一部分数据,这将成倍的减少查询的时间消耗,相应地,成倍的提高查询性能. 在执行Query时,SQL Server 估计其时间 Cost,如果大于…

转自:https://gcc.gnu.org/onlinedocs/gcc-4.0.0/gcc/Function-Attributes.html 5.24 Declaring Attributes of Functions In GNU C, you declare certain things about functions called in your program which help the compiler optimize function calls and check your…

Part 86   Multithreading in C# What is a Process: Process is what the operating system uses to facilitate(帮助) the execution of a program by providing the resources required.Each process has unique process Id associated with(关联) it. You can view the p…

In this tutorial we will discuss about different types of questions that can be used in a Java interview, in order for the employer to test your skills in Java and object-oriented programming in general. In the following sections we will discuss abou…

(EDIT: per the first answer below the current "trick" seems to be using an Atom processor. But I hope some gdb guru can answer if this is a fundamental limitation, or whether there adding support for other processors is on the roadmap?) Reverse…

Concurrency However, becoming adept at concurrent programming theory and techniques is a step up from everything you've learned so far in this book, and is an intermediate to advanced topic. In practice, however, it's much easier to write concurrent…

The JSR-133 Cookbook for Compiler Writers by Doug Lea, with help from members of the JMM mailing list. dl@cs.oswego.edu. Preface: Over the 10+ years since this was initially written, many processor and language memory model specifications and issues…

Contents Tutorial Hello, World Command-Line Arguments Finding Duplicate Lines A Web Server Loose Ends Program Structure Names Declarations Variables Assignments Type Declarations Packages and Files Scope Basic Data Types Integers Floating-Point Numbe…