Thread-aware garbage collection for server applications

Abstract

In recent years server applications using Java become popular. However, they have different performance requirements from other applications: high throughput and small response time. One of obstacles for achieving those requirements is a Java Virtual Machine (JVM). Among the services that a JVM provides, garbage collection affects server applications in throughput and latency. Some JVMs have various garbage collectors for server-side Java but they do not still consider the behavior of server applications. We show that the lifetime pattern of objects is distinguished by the thread that allocates them in server applications. Separating objects and applying different collection policies according to threads, we propose that a garbage collector can achieve both high throughput and small pause time. Experiments show that the throughput of our collector is up to 1.7 times as big as that of previous generational collectors with the same pause time and the pause time of minor collection is smaller by almost 10% on the condition of the same throughput.