【Inference Optimize】Calculate paddle_peak_increase using paddle_allocated_mem_after_run - #4355
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Calculate paddle_peak_increase using paddle_allocated_mem_after_run：
paddle_peak_increase = paddle_allocated_mem_after_run - paddle_allocated_mem_before_runThis way paddle_peak_increase is closer to the actual situation.
The
reservedvariable returns the current memory size managed by the Allocator. Theallocatedvariable returns the current memory size allocated to the Tensor. The difference we are concerned about here is the memory size allocated to the active Tensor before and after the profile. Therefore, theoretically, usingpaddle_allocated_mem_after_run - paddle_allocated_mem_before_runcan meet the requirement. Usingreservedmay cause the calculated difference to be artificially high, resulting in a smaller memory size allocated to the kv-cache