在CUDA,当我们谈论 平行线 执行相同的代码 是否有命令 执行它们?
If, I have 4 threads,for a 1D array of 4 elements.All four threads perfom some operation on some index of the array. Will thread 4 always execute after thread 3 or there is no specific order in the execution?
谢谢!
一般来说, 线条执行没有顺序。 依赖线条顺序来设计您的算法是错误的 。
线索执行没有确定性命令,如果需要特定命令,应该按顺序编程,而不是使用平行执行模式。
在 CUDA 执行模型中, 线索被分组为“ 扭曲 ” 。 取决于底部装置的计算能力, 每一个曲盘( 半曲盘) 都同时执行 - 完全同时执行。 执行过程一直持续到代码锁定为止, 原因是等待记忆传输和另一个曲盘( 半曲盘) 。
不过,文件非常具体地说明了 你可以对这件事的假设: 最好的执行屏障是内核呼叫结束。
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