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共享内存在物理上被分为32个同样宽度（开普勒架构为 8 字节，其他为 4 字节）、能被同时访问的列向内存bank。 共享内存在物理上被分为32个同样宽度（开普勒架构为 8 字节，其他为 4 字节）、能被同时访问的列向内存bank。
====================================== ++++++++++++++++++++++++++++++++++++++
bank0 bank1 ... bank31 bank0 bank1 ... bank31
====================================== ++++++++++++++++++++++++++++++++++++++
layer1 layer1 ... layer1 layer1 layer1 ... layer1
layer2 layer2 ... layer2 layer2 layer2 ... layer2
... ...
layer32 layer32 ... layer32 layer32 layer32 ... layer32
只要同一个线程束内的多个线程不同时访问同一个 bank 中不同层的数据，该线程束对共享内存的访问就只需要 只要同一个线程束内的多个线程不同时访问同一个 bank 中不同层的数据，该线程束对共享内存的访问就只需要