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Avoids incorrectly interpreting CUDA Driver Library error codes as
though they were CUDA Runtime Library error codes (the numbering is
similar, but not identical).
Also cleans up how we initialize and terminate a context for
capability checking in `mon_cross_ctx_copies`.
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On-GPU copy monitoring may have been disfunctional on Maxwell-.
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No longer requires a recompile to change the number or type of copy
monitoring threads.
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Benchmark supports:
=> Generating parallel copies from CPU to GPU in seperate process
=> Granular timestamping of when each portion of the copy completes
=> Monitoring of copy process from either CPU or GPU
=> Tested on platforms including the GV100 and GV11B
Formerly known as diff_ctx_diff_stream.
*** Warning ***
* The current implementation requires some hardcoded parameters
* (such as the number of monitoring threads on the GPU) to be
* updated and recompiled when switching test platform.
***
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