PGI User Forum

[JMa]

Hi Mat,

When an array is claimed to be "mirror" to be visible across the whole praogram, which part of memory acutally hosts this array? I guess it might be global memory? since it can be sychornized between CPU & PGU without the need of "copy", but "update".

Am I corret? If this is true, do you think whether data access speed is slow when the cmputing region is accessing the momories of that array?

Thanks,
Jingsen

[mkcolg]

Hi Jingsen,

The PGI Accelerator Model's "mirror" clause simply mirrors the allocation status of a host and device array. When the host array is allocated, a device array is also allocated in the device's global memory. However, no data movement is performed and hence the use of the "update" clause is necessary when synchronizing the host and device copies.