This paper introduces Simultaneous Speculation Scheduling, a new compiler technique that enables speculative execution of alternative program paths. In our approach concurrently executed threads are generated that represent alternative program paths. Each thread is the result of a speculation on the outcome of one or more branches. All threads are simultaneously executed although only one of th...

In recent years, microprocessor manufacturers have shifted their focus from single-core to multi-core processors. Since many of today’s applications are single-threaded and since it is likely that many of tomorrow’s applications will have far fewer threads than there will be processor cores, automatic thread extraction is an essential tool for effectively leveraging today’s multi-core and tomor...

This paper introduces a novel application of thread-level speculation to a distributed heterogeneous environment. We propose and evaluate two speculative models which attempt to reduce some of the method call overhead associated with distributed objects. Thread-level speculation exploits parallelism in code which is not provable free of data dependencies. Our evaluation of applying thread-level...

Microsecond latencies and access times will soon dominate most datacenter I/O workloads, thanks to improvements in both storage and networking technologies. Current techniques for dealing with I/O latency are targeted for either very fast (nanosecond) or slow (millisecond) devices. These techniques are suboptimal for microsecond devices they either block the processor for tens of microseconds o...