6:36:04no-defun-allowedI modified my hash table to not use a metadata table for probing, and had interesting results.
6:36:37no-defun-allowedOn my desktop computer, metadata was either about as fast or faster than no metadata, about up to 2× faster for one test which does 98% reads.
6:38:19no-defun-allowedOn the university server, the metadata-less table was closer to Click's table, about 2× faster than the table with metadata, but with too much noise to draw conclusions.
6:55:43beachI think those results indicate that it is very hard to measure the performance.