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Memory Usage: Add memory transferred between Kokkos Mem Spaces #272
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Here is output from the stream.cuda in the Kokkos-core benchmarks directory run on Perlmutter on 1 GPU. The number of bytes in the HighWater at the last point in time shown in the first table is equal to the data transferred between host and device.
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This PR adds memory transferred between Kokkos Mem Spaces to the Kokkos Tools memory-usage tool library. This is done based on a request in Kokkos Tools Github Issue #50.
This PR adds functionality to the tool so that the size of data transferred in the deep_copy in a Kokkos application program is accumulated during the execution of a Kokkos program. The deep_copy accumulation is done per Kokkos Memory Space dst->src pair (e.g., OpenMP on host CUDA on device). Note that the "dst" and "src" Kokkos memory space being the same means that there was a deep_copy in the same memory space.
When Kokkos is finalized in a Kokkos application program, the finalize callback prints out the deep_copy accumulations per memory space to the file.