superscalar侧重于指令层面的并行执行，multithreading和hyperthreading则侧重于任务层面的并行处理，而multicore则是从硬件层面提供多个独立的处理核心来同时处理不同的任务。
Particularly we’ll introduce multithreading and hyperthreading techniques, talk about their different approach, highlight their advantages and disadvantages, and discuss their most frequent usage. 2. Multithreading In computer systems, processors execute lightweight sets of instructions that are called ...
这里额外提一句hyperthreading,这个技术比较复杂而且实际表现也没有那么好(在intel顶级CPU上还在使用,追求极致效率),用比较模糊的话说就是把一个CPU核心掰成两半 (其实还是thread的优化),模拟出多个logical units,本质上是建立在multithreading中每个thread利用率不高的前提下进一步提高效率。 superscalar是risc的技术,需要...
4. 另开一条路多核心（multicore）就像并行道路，两个或更多独立的CPU核心可以同时处理不同的程序，互不干扰。结合CPU多线程利用核心性能，superscalar优化指令执行，而hyperthreading是针对低线程利用率的进一步提升，但效果并不总是最佳。总结提高性能的策略需要编程层面的协调，而IBM的某些高端产品支持高并发...
1.Physical id and core id are not necessarily consecutive but they are unique. Any cpu with the same core id are hyperthreads in the same core. 2.Any cpu with the same physical id are threads or cores in the same physical socket. ...
Sun 的 UltraSPARC T2 (和 T1) 也允许 同时多线程 (Intel 实现的称为 Hyper-Threading - Intel 的商标),允许单个核心出现为多个逻辑核心,在单个核心上执行多个线程。 同时多线程背后的大致思想是有多个寄存器来存储处理器状态,因此它看起来实际上有多个核心在单个核心中,因为它有多个完整的硬件寄存器集。 虽然像...
Simultaneous Multithreading (SMT) allows multiple execution threads to be executed on a single physical CPU core. The technology is known by a number of different names, such as Hyper-Threading, but operate along similar principles. Intel provides an excellent overview for Hyper-Threading (HT), an...
Jeffrey Rodriguez
In all of the real-world implementations that I’ve heard of (including Intel Hyper-threading™), there is a separate set of general-purpose registers for each thread. This makes context switches faster, because the core can switch between executing multiple threads without saving all of the ...
A very good article on multithreading, which apparently will be rolled out in Intel's upcoming Prescott chips. Very enlightening, although I kinda wish he'd aknowledged the Amiga as a preemptive multitasking machine way back in 1985, and not making it seem like the Mac did it first (it ...