Batched DGEQRF memory usage

[James Neuhaus]

Hello,

Is there a way to estimate the upper bound of device memory allocated by the routine magma_dgeqrf_batched?

Thanks,

James

[Ahmad Abdelfattah]

Hi James, 

You will have to look at the code in src/dgeqrf_batched.cpp and src/dgeqrf_expert_batched.cpp, and search for all the malloc calls. 

For me, it looks like the “dominant” mallocs are at:

• Lines 136 & 137 in dgeqrf_batched.cpp
• Line 196 in dgeqrf_expert_batched.cpp

There are many other mallocs, but they are just used for allocating auxiliary pointer arrays (depending on your batch size). 

Ahmad

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[James Neuhaus]

Thanks!