Hiding rollback latency in log-based eager hardware transactional memory

Abstract

The use of a rollback buffer (RB) for hiding the rollback latency in log-based eager hardware transactional memory is proposed. The RB allows a transaction to abort without performing rollback, but still makes the transaction's old values immediately available. In effect, the rollback latency almost disappears. When running the Stanford transactional applications for multi-processing benchmark on a 16-core processor that implements the LogTM-SE, the speedup (decrease in execution time) achieved with a 2 KB RB is 15.8% on average.