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Published 20 hours ago • verified publisher icon AMReX-Codes

WriteMultiLevelPlotfile copies data from Pinned to Device memory

Open MaxThevenet opened this issue 5 years ago • 1 comments

In our AMReX-based code Hipace, we allocate the main 3D MultiFab in pinned memory, but when we call WriteMultiLevelPlotfile on this MultiFab it seems to be copied to the device memory. This is limiting because this MultiFab is much larger than the device memory for our production simulations, so it makes the simulation crash. See https://github.com/Hi-PACE/hipace/issues/145 for a full description.

MaxThevenet avatar Sep 25 '20 15:09 MaxThevenet

Update: this only happens if the MultiFab has guard cells. Otherwise, things work as expected.

MaxThevenet avatar Sep 26 '20 04:09 MaxThevenet