Cache GPU objects on second hit #1876
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This patch pushes out the loading of cuDNN and cuSPARSE libraries until required. Moreover, we now record the unusable GPU memory due to fragmentation and use that to avoid unnecessary cudaMalloc failures.
This patch updates the reuse logic of GPU objects to skip the first reference and cache on the second hit. This filters out many never-repeating intermediates, which in turns reduces GPU memory pressure, allocation and deallocation counts.
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