Is there any reason to use one over the other (besides aesthetic purposes)? For example, is there a difference between
!$acc update host(list)
Same idea for update device and pcopyin.
Also, a second unrelated question. Suppose I have the structure below:
!$acc data region copy(a,b,c)
loop that uses a, b, and c
!$acc end kernels
!$acc end data region
The compiler feedback tells me that a, b, and c are copied in the data region, and tells me again that a, b, and c are copied for the kernels region. This is just redundant, and a, b, and c are not actually being copied twice, correct? And is this still correct even in older compilers that don’t by default use the present_or copy versions?