绑定线程处理器 [英] Bind threads to processors

问题描述

当我运行我的多线程code，系统（Linux）的移动，有时从一个处理器线程到另一个。因为我有尽可能多的线程，因为我有处理器，其缓存无效没有充分的理由，它混淆了我的跟踪活动。

When I run my multi-threaded code, the system (linux) sometimes moves the threads from one processor to another. As I have as many threads as I have processors, it invalidates caches for no good reasons and it confuses my tracing activities.

你知道如何线程绑定到处理器，以及为什么系统会做到这一点？

Do you know how to bind threads to processors, and why does a system would do this ?

推荐答案

使用 了sched_setaffinity （这是Linux的特定）。

为什么会产生不同的处理器之间调度交换机线程？好吧，假设你的线程上次运行在处理器1，目前正在等待调度执行一次。在此期间，在不同的线程当前运行在处理器1中，但处理器2是免费的。在这种情况下，这是合理的调度的线程切换到处理器2。然而，一个复杂的调度会尽量避免处理器之间跳跃线程超过必要的。

Why would a scheduler switch threads between different processors? Well, imagine that your thread last ran on processor 1 and is currently waiting to be scheduled for execution again. In the meantime, a different thread is currently running on processor 1, but processor 2 is free. In this situation, it's reasonable for the scheduler to switch your thread to processor 2. However, a sophisticated scheduler will try to avoid "bouncing" a thread between processors more than necessary.

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