| Sumario: | Many shared-memory multithreaded executions behave nondeterministically when run on multiprocessor hardware such as emerging multicore systems. Recording nondeterministic events in such executions can enable deterministic replay—e.g., for debugging. Most challenging to record are memory races that can potentially occur on almost all memory references. For this reason, researchers have previously proposed hardware to record key memory race interactions among threads. The two research groups coauthoring this paper independently uncovered a dual approach: focus on recording how long threads execute without interacting. From this common insight, the groups developed two significantly different hardware proposals. Wisconsin Rerun makes few changes to standard multicore hardware, while Illinois DeLorean promises much smaller log sizes and higher replay speeds. By presenting both proposals in one paper, we seek to illuminate the promise of the joint insight and inspire future designs.
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