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hw08/cuda #9

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Tigerrr07 wants to merge 1 commit into parallel101:main from Tigerrr07:hw08/cuda

Tigerrr07 commented Mar 30, 2022

（迟来的Pr...）

filter_positive()有什么问题?
在一个线程中对counter+1时，可能会有另外一个线程同时取出counter的旧值+1，而不是最新值，因此造成错误。使用atomicAdd()原子操作避免上述问题
fill_sin改为网格跨步循环后，可以指定任意的线程数（blockDim）和板块数（gridDim），无需担心越界或漏元素的问题
“边角料法”对于不是 1024 整数倍的 n 会出错，为什么？
若n = 1025，n / 1024 = 1，总共会启动1*1024=1024个线程，会漏掉1个元素
CPU访问数据遗漏了同步，同步可以让CPU陷入等待，等GPU中的任务队列执行完毕后才继续工作


          hw08/cuda

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