问题描述
大家好，
在阅读了有关多核处理器的并行编程之后，我有一些疑问.
Hi All,
After reading about parallel programming by multicore processor,I have some doubts.
- 无疑是X-Box游戏台的最佳主意[因为它们有很多核心]
但是，对于在Windows 7 64位操作系统中运行8个并行进程然后运行100个线程的核心i7来说，它是否有效? - 如果有人设法通过较少的关键资源设法使所有进程并行运行，那么它将如何?
- 如果没有，那么它可以提供更好的性能?
- 在这种情况下，我可以看到多核编程[我正在使用Open MP尝试VC ++]在i7，win 7 [64位]中赢得了多线程， 4GB内存?
- Its undoubtedly best idea for play stations,X-Box [as they have soo... many cores]
But will it prove to be effective for core i7 running 8 parallel process then running 100 thread in Windows 7 64 bit? - If some how its managed to make all the process running parallel with less critical resource to then will it give better performance over 100 thread?
- If not then in which case I can see multicore programming[I am trying VC++ with Open MP] winning over multi thread in my i7,win 7[64 bit] ,4GB ram?
如果我可以用C ++或JAVA的代码在我的机器上运行以比较正在运行的相同任务，那将是很好的
- 平行
- 序列
- 线程
- parallel
- sequence
- thread
- XBox，PS3实际上只有几个核心，例如PC.
- PS3-8用于单元，在PS3变体中实现6.
- Xbox360-3用于PowerPC Xenon
- XBox, PS3 actually only have a couple of cores, like PCs.
- PS3 - 8 for the cell, 6 as implemented in ps3 variants.
- Xbox360 - 3 for the PowerPC Xenon
It will be great If I can get a code in C++ or JAVA to run in my machine to compare same task running
推荐答案
游戏中Point3的一个例子-当我创建一个应用程序以同时下载rss feed时，线程数可能会从1增加到大约15.我要做的就是生成新线程.这些线程在我的i3的2个物理核心和所有4个逻辑处理器上均执行，而没有我的任何指示.所以我的意思是，在i7中，只要有多线程就绪，就几乎可以肯定(或可以肯定?)采用多核处理.
由于主内存现在以GB为单位进行度量，因此缓存内存仍仅以个位数MB进行度量-缓存通常是最常占用资源的资源.我的理解是，多个进程将比多线程更快地吞噬缓存.就闲置cpu周期而言，缓存丢失通常非常昂贵，因此要努力减少缓存丢失. -现代cpus经常具有以cpu速度运行的缓存，而主内存甚至从未接近此数字.
真正广泛而有趣的研究主题.
An example of point3 in play - when I create an app to perform simultaneous download of rss feeds, the number of threads may go from 1 to about 15. All I do is spawn new threads. These threads execute on both of the 2 the physical cores in my i3, and all 4 of the logical processors without any direction from me. So my point is, in the i7 whenever you''ve got multi-threading in place, you''re almost certainly (or certainly?) employing multi-core processing.
Because the main memory is now measured in GB, yet the cache memory is still only measured in single-digit MBs - the resource that will be most often taxed is the cache. It''s my understanding that multiple processes will eat-up the cache much faster than multiple threads. Cache-misses are generally very expensive in terms of idle cpu-cycles, hence the effort taken to reduce them. - Modern cpus often have cache memory that runs at cpu speed, while main memory is never even close to this figure.
Truly broad and interesting topic for study.
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