Chapter 19. Configuring the IO Subsystem
19.1. IO Subsystem Overview
io subsystem defines the XNIO workers and buffer pools used by other subsystems, such as Undertow and Remoting. These workers and buffer pools are defined within the following components in the
Default IO Subsystem Configuration
<subsystem xmlns="urn:jboss:domain:io:3.0"> <worker name="default"/> <buffer-pool name="default"/> </subsystem>
19.2. Configuring a Worker
Workers are XNIO worker instances. An XNIO worker instance is an abstraction layer for the Java NIO APIs, which provide functionality such as management of IO and worker threads as well as SSL support. By default, JBoss EAP provides single worker called
default, but more can be defined.
Updating an Existing Worker
To update an existing worker:
Creating a New Worker
To create a new worker:
Deleting a Worker
To delete a worker:
For a full list of the attributes available for configuring workers, please see the IO Subsystem Attributes section.
19.3. Configuring a Buffer Pool
IO buffer pools are deprecated as of JBoss EAP 7.2. While they are still set as the default in the current release, they will be replaced by Undertow byte buffer pools in a future release.
Buffer Pools are pooled NIO buffer instances. Changing the buffer size has a big impact on application performance. For most servers, the ideal size is usually 16k.
Updating an Existing Buffer Pool
To update an existing buffer pool:
Creating a Buffer Pool
To create a new buffer pool:
Deleting a Buffer Pool
To delete a buffer pool:
For a full list of the attributes available for configuring buffer pools, please see the IO Subsystem Attributes section.
19.4. Tuning the IO Subsystem
For tips on monitoring and optimizing performance for the
io subsystem, see the IO Subsystem Tuning section of the Performance Tuning Guide.