Lookahead for GETRF Native

[aran nokan]

Hi,

I am checking the code of dgetrf (native mode) to see how lookahead is working, but I am not able to detect it. I am seeing two queues but I think one queue is just for providing the pivot list. Could you please give me some hint ?

Best regards,

A.N.

[Ahmad Abdelfattah]

Ideally, the panel is executed on queues[0] while the update is on queues[1]. 

In some cases, depending on which panel kernel is being invoked, the panel on queues[0] need to synchronize with queues[1]. Refer to src/zgetf2_native.cpp for more details. Keep in mind that, since everything is on the GPU in the native mode, the expected overlap from the lookahead might not be full. 

Thanks,

Ahmad

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