OpenCL中的处理器相似性 [英] Processor Affinity in OpenCL

问题描述

我们可以在OpenCl中强加procssor亲和力吗?例如，线程1在处理器5上执行，
线程2在处理器6上执行，线程3在处理器7上执行，依此类推?

Can we impose procssor affinity in OpenCl? For example thread# 1 executes on procesor# 5,
thread# 2 executes on procesor# 6, thread# 3 executes on procesor# 7, and so on ?

谢谢

推荐答案

据我所知，您无法在如此低的级别上指定与OpenCL的关联性.但是，从OpenCL 1.2开始，可以使用 clCreateSubDevices (可能使用CL_DEVICE_PARTITION_BY_COUNTS, 1在每个子设备中使用一个处理器)，并在每个子设备上运行单独的内核执行.

You can't specify affinity at that low level with OpenCL as far as I know. But, starting with OpenCL 1.2 have some control over affinity by partitioning into subdevices using clCreateSubDevices (possibly with one processor in each subdevice by using CL_DEVICE_PARTITION_BY_COUNTS, 1) and running separate kernel executions on each subdevice.

除了基于CPU的OpenCL实施之外，这很可能无法很好地运行，我不得不质疑为什么要这样做.如果要限制OpenCL-CPU实现的CPU使用率，可以使用clCreateSubDevices分配一些计算资源.

This would very likely run poorly on anything other than a CPU-based OpenCL implementation, and I'd have to question why you would want to do such a thing. If you want to limit CPU usage for an OpenCL-CPU implementation, you could use clCreateSubDevices to portion off some of your computing resources.

此处描述了来自英特尔的设备裂变"的PDF，其中包含有关如何使用设备的大量信息.分区和clCreateSubDevices有效.

A PDF describing 'device fission' from Intel is here, and it has lots of info on how to use device partitioning and clCreateSubDevices effectively.

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