Software
IBM Group
IBM WebSphere Application Server V7
Runtime provisioning
2007 IBM Corporation
Updated September 15, 2008
This presentation will discuss the runtime provisioning component of WebSphere Application
Server version 7.
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Overview
V7 Runtime Provisioning
Historical startup and runtime memory footprint
Benefits of Runtime Provisioning
A little info on how it works
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Runtime provisioning
2007 IBM Corporation
This presentation will start by discussing historical runtime and memory footprint aspects of
WebSphere Application Server version 7.
It will then discuss the benefits of the runtime provisioning component and how it works.
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Section
WebSphere Application Server Historical
WebSphere
Startup and Runtime
Startup
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This section will discuss historical aspects of the startup and runtime of WebSphere Application
Server.
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Historical facts and figures
Historically since WebSphere Application Server
V4.0 Startup time and memory footprint have
grown
Approximately 15% growth in startup time per release
Approximately 15% growth in memory footprint per
release
Approximately 16 Meg increase in JVM footprint per
release
Result of significant new functionality per release
Pre V7 servers aggressively start components that
might not be used by deployed applications
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In the past WebSphere Application Servers startup time and memory footprint have grown with
each release.
With significant new functionality included in each release of the Application Server, startup time
has grown slightly with each release, as well as the Application Servers
Memory footprint.
Prior to version 7, servers would start components of the application server that may not be
used by deployed applications regardless of use.
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Previous work to reduce footprint
Asynchronous start capability for runtime
components
Lazy EJB initialization
Framework uses Java 5 shared class cache for
WebSphere runtime classes
(limited to platforms using IBM JRE)
Light-weight Runtime Configuration Service
reduces up to 20% of runtime classes loaded
previously at startup
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There has been work in previous versions of WebSphere Application Server to reduce the
amount of growth in the memory footprint.
This work has included the introduction of an Asynchronous start capability for runtime
components and the lazy initialization of EJBs.
With Lazy initialization EJBs are not loaded into memory at deploy time of an Enterprise
application, but are loaded into memory at the
Time they are referenced.
The WebSphere framework of WebSphere 6.1 uses the Java version 5 shared class cache for
runtime classes. This has helped to reduce the
Memory footprint of the framework by allowing classes to be shared by common components.
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Section
Runtime Provisioning
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Runtime provisioning
2007 IBM Corporation
This section will discuss the benefits of the runtime provisioning component that has been added
to WebSphere Application Server version 7.
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Benefits of runtime provisioning
Improvements in the amount of time it takes to start
an Application Server
Reduction in the application server memory
footprint
Only a subset of components are started in a
running server
Server start time is reduced
Memory footprint is reduced
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Runtime provisioning
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There are several benefits that the runtime provisioning component adds to WebSphere
Application server version 7.
Runtime provisioning reduces the amount of time that it takes to start an application server.
The memory footprint of a web application is reduced by starting only a the components that are
needed to run the application,
While still keeping the application server in compliance with the Java EE 5 specification.
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Section
How it works
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Runtime provisioning
2007 IBM Corporation
This section will discuss how the runtime provisioning component works.
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Runtime provisioning
Intelligent analysis of application set and server
configuration determine the set of components to
activate
Administrators and application deployers do not have to
modify any processes to take advantage of provisioning
A check box on the server page in the administrative
console activates provisioning on a per server basis
Disabled by default
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Runtime provisioning
2007 IBM Corporation
The runtime provisioning component is disabled by default on the application servers in
WebSphere Application Server version 7.
A check box has been added to the server configuration page in the administrative console that
allows administrators to enable
The runtime provisioning aspect of the Application Server.
The runtime provisioning component analyzes the deployed applications on the application
server to determine which runtime components to enable to successfully
Run the application. If some components, for example the runtime for enterprise java beans, is
not required to run the deployed applications, that particular
Component will not be enabled, in resulting a lower memory footprint for the application server.
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How to activate runtime provisioning
In the administrative console
Application servers > serverName page > Start components
as needed
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Runtime provisioning
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This page shows the check box that has been added to the server configuration page of the
administrative console.
The check box is labeled start components as needed. Checking this box on a servers
configuration page in the administrative console
Enables runtime provisioning on this server.
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Scenarios
Examples of scenarios where some components
are not activated
Web Application using Servlets and JDBC
No EJB, no security, no naming directory components are
activated saving start time and memory footprint
Node Agent, Deployment Manager, z/OS Control
Region server, Proxy Server, Administrative Agent
Servers eagerly start components
With Runtime Provisioning enabled only subsets of
components are loaded
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Another example where some components may not be activated by enabling runtime
provisioning on a server include a simple web application.
If a simple web application is run on the application server with runtime provisioning enabled, not
all server runtime components are enabled, for example
Security and enterprise java bean supporting runtime classes.
Servers potentially start more components than are needed by the applications that are
deployed on them.
Enabling Runtime provisioning on WebSphere Application Server version 7 allows only a subset
of the entire runtime library to be loaded into memory
Resulting in a smaller memory footprint and reduced startup time.
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IBM Software Group
Summary
V7 runtime provisioning provides performance
benefits
Reduced start time of application servers
Reduced memory footprint
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Runtime provisioning
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In Summary, the runtime provisioning component of WebSphere Application Server version 7
reduces the memory footprint and startup time of applications
That do not need all of the runtime libraries that the application server has to offer.
Through intelligent analysis of the applications that are deployed on the server, the runtime
provisioning component loads only a subset of the available
Runtime components that are needed to run them.
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Trademarks, copyrights, and disclaimers
The following terms are trademarks or registered trademarks of International Business Machines Corporation in the United States, other countries, or both:
IBM
WebSphere
Java, and all Java-based trademarks are trademarks of Sun Microsystems, Inc. in the United States, other countries, or both.
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Runtime provisioning
16_WASv7_RuntimeProvisioning.ppt
2007 IBM Corporation
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