16. An apparatus, comprising: a computer with a memory storing: computer instructions creating a functional coverage model; computer instructions running random simulations from at least one seed; computer instructions merging coverage logs of the functional coverage model generated by verification of a hardware description language circuit design, as the coverage logs are generated, without waiting for all pending coverage logs; and computer instructions analyzing the merged coverage logs, refining the functional coverage model, and deleting at least part of previous coverage logs, responsive to said merging.
16. An apparatus, comprising: a computer with a memory storing: computer instructions creating a functional coverage model; computer instructions running random simulations from at least one seed; computer instructions merging coverage logs of the functional coverage model generated by verification of a hardware description language circuit design, as the coverage logs are generated, without waiting for all pending coverage logs; and computer instructions analyzing the merged coverage logs, refining the functional coverage model, and deleting at least part of previous coverage logs, responsive to said merging. 18. The apparatus of claim 16 , wherein the memory further stores: computer instructions generating a coverage report, responsive to said merging and to a predetermined condition being met.