我们可以知道哪个块/线程找到设备内存的最小值吗？ [英] Can we know which block/thread find the minimum value of the device memory?

问题描述

cuda atomicMin 操作似乎只找到设备内存中继的最小值。但是，有没有反正找到哪个块/线程最终找到这个最小值？我有compute-2.0。

cuda atomicMin operation seems only find the minimum value of a device memory trunk. But, is there anyway to find which block/thread finally find this minimum value? I have compute-2.0.

推荐答案

如果你正在做一个 atomicMin 在32位值上，可以对64位值使用广义原子操作，其中32位表示最小值，其中32位表示线程的全局索引。 此处概述了一般方法。

If you are doing an atomicMin on a 32-bit value, you can use a generalized atomic operation on a 64 bit value, 32 bits of which represent the minimized value, and 32bits of which represent the global index of the thread. A general approach is outlined here.

由于64位 atomicMin 是仅支持cc 3.5设备，我假设您找到的是32位最小值。

Since 64 bit atomicMin is only supported on cc 3.5 devices, I assume you are finding 32-bit minimum values.

如果您正在工作使用64位值，则可以使用并行缩减技术通过缩减来携带最小（或最大）值和索引。 此问题/ answer 演示了一种平行缩减方法，它可以找到矩阵的每行的最大值和索引。

If you are working with 64-bit values, then you can use a parallel reduction technique to carry both the minimum (or maximum) value and the index through the reduction. This question/answer demonstrates a parallel reduction approach which finds both maximum and index, per row of a matrix.

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