使用不同数量的多核工人时的不同行为 [英] different behavior when using different number of multicoring workers

问题描述

我在我的程序上玩了一些(尝试多核一些部分)，并且我发现"CPU历史记录"看起来有些不同，这取决于我要启动多少个工人. 2-4个工作人员似乎产生了稳定"的工作流程，但是将5-8个工作人员挂钩会产生不稳定的行为(从零到最大，请参见图片).我应该指出，所有运行都以平滑的"最大容量开始(例如，只有25％的2个内核)，并且仅在一分钟左右后才开始表现出不稳定的行为. 这是怎么回事?我有4核处理器，您是否认为此行为可能与此事实有关?

I am playing around a bit with my program (trying to multicore a few parts) and I've noticed the "CPU history" looks a bit different, depend on how many workers I start. 2-4 workers seems to produce a "stable" workflow, however pegging 5-8 workers produces erratic behavior (from zero to max, see pictures). I should point out that all runs started out with "smooth" max capacity (e.g. 2 cores with only 25%), and started to exhibit erratic behavior only after a minute or so. What's going on? I have 4 core processor, and do you think this behavior may be related to this fact?

希望您能看到图片.

2名工人

3名工人

4名工人

5名工人

6名工人

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8名工人

推荐答案

这是具有超线程功能的四核处理器上的经典行为. R不能通过超线程获得收益，因为它经常使用完整的内核进行计算.因此，如果一个物理处理器使两个逻辑处理器相符，则该处理器必须在两个线程之间连续切换，这说明了模式.

This is classic behaviour on a quad-core with hyperthreading. R doesn't gain with hyperthreading, as it uses often the complete core for the calculations. Thus, if one physical processor makes 2 logical ones, the processor has to switch continuously between both threads, which explains the patterns.

对于R，我推迟了计算机上的超线程.相反，它只是无济于事.当像R一样正常使用一个线程时，您会失去容量(最大值是12.5％，而不是25％).

For R, I put off the hyperthreading on my computer. It just doesn't help, in contrary. When working with only one thread as R does normally, you lose capacity (max is 12.5% instead of 25%).

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