[9.2][GPU] Copy to host in case of small matrices to release resources early (#136464) #136532
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…ly (elastic#136464) This PR makes a small change to improve parallelism during graph build which we noticed with NVIDIA from profiler traces. In case the resulting graph is "small enough" (where "small enough" is ATM set to 128 MB) we copy the graph entirely to host memory, release the cuvs resources and proceed, instead of downloading data in pages from the device and write each page to disk, which is more efficient but will hold the resources till we finished writing to disk -- on a busy system this can require time.
ldematte
added
>non-issue
backport
auto-merge-without-approval
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Backport of #136464