TABLE3–3 Tunable ORBSettings (Continued)
RMI/ IIOP from ORBto Enterprise Server communication
infrastructure, thread
pool
steady-thread-pool-size, max-thread-pool-size,
idle-thread-timeout-in-seconds
RMI/ IIOP from a vendorORB parts of communication
infrastructure, thread
pool
steady-thread-pool-size, max-thread-pool-size,
idle-thread-timeout-in-seconds
In-process thread pool steady-thread-pool-size,max-thread-pool-size,
idle-thread-timeout-in-seconds
Tunable ORB Parameters
Tune the following ORB parameters using the Admin Console:
■
Thread Pool ID: Name of the thread pool to use.
■
Max Message Fragment Size: Messages larger than this number of bytes will be fragmented.
In CORBA GIOPv1.2, a Request, Reply, LocateRequest and LocateReply message can be
broken into multiple fragments. The rst message is a regular Request or Reply message
with more fragments bit in the ags eld set to true. If inter-ORB messages are for the most
part larger than the default size (1024 bytes), increase the fragment size to decrease latencies
on the network.
■
Total Connections: Maximum number of incoming connections at any time, on all listeners.
Protects the server state by allowing nite number of connections. This value equals the
maximum number of threads that will actively read from the connection.
■
IIOP Client Authentication Required (true/false)
ORB Thread Pool Parameters
The ORB thread pool contains a task queue and a pool of threads. Tasks or jobs are inserted into
the task queue and free threads pick tasks from this queue for execution. Do not set a thread
pool size such that the task queue is always empty. It is normal for a large application’s Max Pool
Size to be ten times the size of the current task queue.
The Enterprise Server uses the ORB thread pool to:
■
Execute every ORB request.
■
Trim EJB pools and caches.
Thus, even when one is not using ORB for remote-calls (via RMI/ IIOP), set the size of the
threadpool to facilitate cleaning up the EJB pools and caches.
Set ORB thread pool attributes under Congurations > cong-name > Thread Pools >
thread-pool-ID, where thread-pool-ID is the thread pool ID selected for the ORB. Thread pools
have the following attributes that aect performance.
ORBSettings
SunGlassFishEnterpriseServer2.1PerformanceTuningGuide • January200972
