On the Intel type of x86 processors including AMD, increasingly there are more CPU cores or processors running in parallel. In the old days when there was a single processor, the operation: ++i; Would be thread safe because it was one machine instruc…

2iSome years ago I started work on my first CUDA implementation of the Multiparticle Collision Dynamics (MPC) algorithm, a particle-in-cell code used to simulate hydrodynamic interactions between solvents and solutes. As part of this algorithm, a num…

1.啥是java的原子性 原子性:即一个操作或者多个操作 要么全部执行并且执行的过程不会被任何因素打断,要么就都不执行. 一个很经典的例子就是银行账户转账问题: 比如从账户A向账户B转1000元,那么必然包括2个操作:从账户A减去1000元,往账户B加上1000元. 试想一下,如果这2个操作不具备原子性,会造成什么样的后果.假如从账户A减去1000元之后,操作突然中止.然后又从B取出了500元,取出500元之后,再执行 往账户B加上1000元 的操作.这样就会导致账户A虽然减去了1000元,但是…

原文:http://www.androidauthority.com/arm-vs-x86-key-differences-explained-568718/ Android supports 3 different processor architectures: ARM, Intel and MIPS. The most popular and ubiquitous of these three is, without a doubt, ARM. Intel is well known pr…

深入分析Volatile的实现原理 引言 在多线程并发编程中synchronized和Volatile都扮演着重要的角色,Volatile是轻量级的synchronized,它在多处理器开发中保证了共享变量的"可见性".可见性的意思是当一个线程改动一个共享变量时,另外一个线程能读到这个改动的值. 它在某些情况下比synchronized的开销更小.本文将深入分析在硬件层面上Inter处理器是怎样实现Volatile的,通过深入分析能帮助我们正确的使用Volatile变量. 术语定义 术…

A multiprocessing system having a plurality of processing nodes interconnected by an interconnect network. To optimize performance during spin-lock operations, a home agent prioritizes the servicing of read-to-own (RTO) transaction requests over the…

In one embodiment, a method includes receiving an instruction for decoding in a processor core and dynamically handling the instruction with one of multiple behaviors based on whether contention is predicted. If no contention is predicted, the instru…

A method and apparatus for a atomic operation is described. A method comprises receiving a first program unit in a parallel computing environment, the first program unit including a memory update operation to be performed atomically, the memory updat…

While 64-bit x86 processors have now been on the market for more than 5 years, software support is only slowly catching on. 64-bit x86, or x86-64 as its inventors at AMD called it, not only offers programmers the ability to manipulate and address dat…

Welcome back to what’s going to be the last “official” part of this series – I’ll do more GPU-related posts in the future, but this series is long enough already. We’ve been touring all the regular parts of the graphics pipeline, down to different le…