Class data sharing (CDS) helps reduce the startup time for Java programming language applications, in particular smaller applications, as well as reduce footprint. When the JRE is installed on 32-bit platforms using the installer, the installer loads a set of classes from the system jar file into a private internal representation, and dumps that representation to a file, called a "shared archive". Class data sharing is not supported in Microsoft Windows 95/98/ME. If the JRE installer is not being used, this can be done manually, as explained below. During subsequent JVM invocations, the shared archive is memory-mapped in, saving the cost of loading those classes and allowing much of the JVM's metadata for these classes to be shared among multiple JVM processes.
Class data sharing is supported only with the Java HotSpot Client VM, and only with the serial garbage collector.
The primary motivation for including CDS in Java SE is the decrease in startup time it provides. CDS produces better results for smaller applications because it eliminates a fixed cost: that of loading certain core classes. The smaller the application relative to the number of core classes it uses, the larger the saved fraction of startup time.
The footprint cost of new JVM instances has been reduced in two
ways. First, a portion of the shared archive, currently between
five and six megabytes, is mapped read-only and therefore shared
among multiple JVM processes. Previously this data was replicated
in each JVM instance. Second, since the shared archive contains
class data in the form in which the Java Hotspot VM uses it, the
memory which would otherwise be required to access the original
class information in rt.jar is not needed. These
savings allow more applications to be run concurrently on the same
machine. On Microsoft Windows, the footprint of a process, as
measured by various tools, may appear to increase, because a larger
number of pages are being mapped in to the process' address space.
This is offset by the reduction in the amount of memory (inside
Microsoft Windows) which is needed to hold portions on
rt.jar. Reducing footprint remains a high
priority.
Under some circumstances the system administrator may need to manually regenerate the shared archive. This is typically only necessary on Solaris if the Java SE packages were installed over the network to a machine of a different architecture than that performing the installation. Regardless, these regeneration instructions apply to all supported platforms.
The shared archive file is colocated with the shared library for
the JVM. On Solaris, Linux, or Mac OS X platforms, it is stored in
jre/lib/[arch]/client/classes.jsa and on Microsoft
Windows platforms in jre/bin/client/classes.jsa. If
this file exists, it must be manually removed before
regeneration.
To regenerate the archive, log in as the administrator; in networked situations, log on to a machine of the same architecture as the Java SE installation and ensure that you have permission to write to the installation directory. Then execute the command
java -Xshare:dump Diagnostic information will be
printed as the archive is generated.
The class data sharing feature is automatically enabled when conditions allow it to be used. The following command line options are present primarily for diagnostic and debugging purposes and may change or be removed in future releases.
-Xshare:off-Xshare:on-Xshare:auto