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Cuda atomic操作

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注意:函数运算完之后,会将运算结果保存在第一个参数指针指定的空间位置,返回的是old值。


int atomicAdd(int* address, int val);
unsigned int atomicAdd(unsigned int* address,
unsigned int val);
unsigned long long int atomicAdd(unsigned long long int* address,
unsigned long long int val);
float atomicAdd(float* address, float val);
double atomicAdd(double* address, double val);
reads the 32-bit or 64-bit word old located at the address address in global or shared memory, computes (old + val), and stores the result back to memory at the same address. These three operations are performed in one atomic transaction. The function returns old.


The 32-bit floating-point version of atomicAdd() is only supported by devices ofcompute capability 2.x and higher.


The 64-bit floating-point version of atomicAdd() is only supported by devices ofcompute capability 6.x and higher.


atomicAdd完成的工作是把某个固定内存位置的数据进行加法操作,第一个参数是一个指针,读取原始值返回,进行加法计算后的新值会存储到内存,整个过程对于当前线程是原子性操作,不会被其他线程抢占。这也是一种通信操作,对性能会造成影响。



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