Contemporary microprocessors seek at improving perfomance through thread-level parallelism by co-executing multiple threads on a single microprocessor chip. Many-thread processors, however, lead to non-dependable performance: co-executing threads affect each other's performance in unpredictable ways because of resource sharing across threads. DPMP envisions that performance introspection using a cycle accounting architecture that estimates single-thread progress during many-thread execution. The ability to track per-thread progress enables system software to deliver dependable performance by assigning hardware resources to threads depending on their relative progress.