add benchmark_from_scratch flag #1881
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This PR allows user to select whether to benchmark the solver from scratch or not.
The previous behavior is to benchmark the solver from scratch every time, which will benchmark the workspace initialization every time.
The proposed behavior is to benchamark the same solver object such that we only need to initialize the workspace in the first run (or warmup).
User can set it
--benchmark_from_scratch=true
again to benchmark the solver with initialization.