ACM SIGPLAN 2009 Conference on Programming Language Design and Implementation (PLDI), June 2009.
Data races are one of the most common and subtle causes of pernicious
concurrency bugs. Static techniques for preventing data races are
overly conservative and do not scale well to large programs. Past
research has produced several dynamic data race detectors that can be
applied to large programs. They are precise in the sense that they
only report actual data races. However, dynamic data race detectors
incur a high performance overhead, slowing down a program.s execution
by an order of magnitude.
In this paper we present LiteRace, a very lightweight data race detector that samples and analyzes only selected portions of a program.s execution. We show that it is possible to sample a multithreaded program at a low frequency, and yet, find infrequently occurring data races. We implemented LiteRace using Microsoft.s Phoenix compiler. Our experiments with several Microsoft programs, Apache, and Firefox show that LiteRace is able to find more than 70% of data races by sampling less than 2% of memory accesses in a given program execution.