Stream and Event Behavior

Operators will fail to be delivered in a stream that does not belong to the current device. The sample code is as follows:

aclrtSetDevice(0);                 // Specify device 0 as the compute device.
aclrtStream s0;                    
aclrtCreateStream(&s0);            // Create stream s0 on device 0.
myKernel<<<8, nullptr, s0>>>();    // Deliver operators on device 0 through stream s0.

aclrtSetDevice(1);                 // Specify device 1 as the compute device.
aclrtStream s1;
aclrtCreateStream(&s1);            // Create stream s1 on device 1.
myKernel<<<8, nullptr, s1>>>();    // Deliver operators on device 1 through stream s1.

// Operator delivery failure
myKernel<<<8, nullptr, s0>>>();    // Deliver operators on device 1 through stream s0.

If the device to which a stream belongs is different from the current device, calling aclrtMemcpyAsync in the stream will fail.
If an event and a stream are associated with different devices, calling aclrtRecordEvent will fail.
If an event and a stream are associated with different devices, calling aclrtStreamWaitEvent will fail.
If the device to which an event belongs is different from the current device, calling aclrtSynchronizeEvent and aclrtQueryEvent will be successful.

Parent topic: Multi-device programming