Generational garbage collectors perform well for short-lived objects, but do not deal well with long-lived objects. Existing techniques for long-lived objects, such as pretenuring, eliminate work in the nursery; however, the collector still needs to deal with the long-lived objects in the older generations. We introduce a novel scheme employing regions that avoids both nursery and old generatio...

Generational garbage collection (GGC) is one of the most popular garbage collection techniques. GGC gains a performance advantage by performing minor collections on the younger objects in the heap, reducing the number of major collections of the whole heap. A promotion policy determines when an object moves from the younger generation to the older. The design of GGC has been justified by the pl...

Reference counting is a classical garbage collection method. Recently, a series of papers have extended the basic method to drastically reduce its notorious overhead and extend the basic method to run concurrently and efficiently on a modern computing platform. In this paper we investigate the use of prefetching to further improve the efficiency of the reference-counting collector. We propose p...

Defining persistence in terms of reachability is fundamental to achieving orthogonality of persistence. It is implicit to the principles of orthogonal persistence and is a part of the ODMG 3.0 data objects standard. Although space reclamation in the context of persistence by reachability can be achieved automatically using garbage collection, relatively few papers address the problem of impleme...

A population-based case comparison study of incident lung cancer and occupational risk factors was conducted in the tricounty Detroit metropolitan area. Nearly 6000 lung cancer cases and a comparison group of 3600 colon cancer cases were interviewed. This report includes 3792 white and black male lung cancer cases and 1966 black and white colon cancer referents. Cigarette smoking, age at diagno...

PURPOSE Bioaerosols and their constituents, such as endotoxins, are capable of causing an inflammatory reaction at the level of the lung-blood barrier, which becomes more permeable. Thus, it was hypothesized that occupational exposure to bioaerosols can increase leakage of surfactant protein-D (SP-D), a lung-specific protein, into the bloodstream. METHODS SP-D was determined by ELISA in 316 w...

Current user-mode machine simulators typically do not support simulation of dynamic compilation, threads, or garbage collection, all of which Java Virtual Machines (JVMs) require. In this paper, we describe, evaluate, and validate Dynamic SimpleScalar (DSS). DSS is a tool that simulates Java programs running on a JVM, using just-in-time compilation, executing on a simulated multi-way issue, out...

A reference counting garbage collector cannot reclaim unreachable cyclic structures of objects. Therefore, reference counting collectors either use a backup tracing collector seldom, or employ a cycle collector to reclaim cyclic structures. Recently, the first on-the-fly cycle collector, that may run concurrently with program threads, was presented by Bacon and Rajan [3]. This demonstrated the ...

A growing number of libraries written in managed languages, such as Python and JavaScript, are bringing about new demand for a foreign language interface (FFI) between two languages. Such an FFI allows host-language program to seamlessly call library function exchange objects. It is often implemented by user-level but implementation cannot reclaim cyclic garbage, or group objects with circular ...