In the first part of this TechTip, I showed you how to install and set up the open-source application server JBoss on System i. I also covered the steps necessary to deploy the sample EJB3Trail application. This time, I will walk you through the process of integrating the JBoss instance with i5/OS work management to provide better performance and manageability of the EJB3 applications.
The i5/OS work management is far superior to that of any other operating system with which I'm familiar in terms of its ability to assign various workloads into separate subsystems with dedicated system resources. A subsystem is a predefined operating environment entity that the system uses to coordinate the work flow and resource use. In addition, a memory pool can be used to further separate the workloads. A memory pool is a division of main storage, and it can be assigned to a subsystem so that the jobs running in a given subsystem do not have to compete for memory access with jobs in other subsystems.
Now, I will use these fundamental concepts to create a shared memory pool and a separate subsystem for the JBoss application server.
Setting Up a Shared Memory Pool
The i5/OS supports both shared and private memory pools. The shared pools are more flexible, because they allow sharing of unused memory between pools and they can also use the Expert Cache. The Expert Cache is a disk cache tuner that can reduce the time to process disk I/O. The i5/OS contains 64 predefined shared pools that can be allocated to subsystems. You can use either the graphical iSeries Navigator or the CL commands to configure a shared pool. To save space (and time?), I use CL commands in the course of this TechTip.
You can use the Work with Shared Pools (WRKSHRPOOL) command to configure the shared pool for JBoss. The command displays the names and status of the shared pools. The first four pools on the list are predefined by IBM, so you need to choose one of the other pools labeled *SHRPOOL1 through *SHRPOOL60. Locate the specific pool you want to configure, say *SHRPOOL2. You need to set three parameters:
- Defined Size (M)—This is the amount of main storage, in megabytes, defined, for the pool. The memory requirement depends on the application. A good starting point would be 1.5–2 GB of memory for a good-sized application server. Then, monitor the paging rates to see if the memory size is adequate for your environment.
- Maximum Active—This identifies the maximum number of threads that can use the processor concurrently. Set this parameter to 500.
- Paging Option—The paging option determines whether the system should dynamically adjust the paging characteristics of the pool for optimum performance. Set it to *CALC to enable Expert Cache tuning.
Alternatively, you could execute the following Change Shared Pools (CHGSHRPOOL) command:
Setting Up the JBoss Subsystem
The process of creating a subsystem is pretty straightforward. First, I use the Create Subsystem Description (CRTSBSD) command:
CRTSBSD SBSD(JBOSS4/JBOSS4) POOLS((1 *SHRPOOL2)) TEXT('JBoss
processing subsystem')
For simplicity, I keep all JBoss work management objects in a separate
library called JBOSS4. I also instruct the system to use the memory
from the *SHRPOOL2 storage pool to service the jobs running in this subsystem.
I create a unique job queue that is used to queue up jobs waiting to be
processed in the new subsystem. Here's the Create Job Queue (CRTJOBQ)
command that accomplishes this task:
CRTJOBQ JOBQ(JBOSS4/JBOSS4JOBQ) TEXT('Job queue for the JBOSS4 processing subsystem')
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