Class data sharing (CDS) is a new feature in J2SE 5.0 intended to 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 Sun provided 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 Sun 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.
In J2SE 5.0, 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 the 5.0 release 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.
Regenerating the Shared Archive
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 Unix 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 J2SE 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