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en.help.ref-threadpools.html Maven / Gradle / Ivy

Thread Pools
Use the Thread Pools page to configure thread pools.

Use thread pools to limit a service to a specific number of
concurrent threads.

When you first install the GlassFish Server, two thread pools exist by default.
The thread pool named http-thread-pool is configured for use by network listeners, while
thread-pool-1 is configured for use by the ORB for RMI/IIOP requests. You may
need to create a thread pool with different settings for use by particular
kinds of applications and for particular hardware systems, or to tune the default
thread pools for your needs.

The Java Virtual Machine (JVM) can support many threads of execution at once.
To help performance, theGlassFish Server maintains one or more thread pools. It is
possible to assign specific thread pools to specific services.

One thread pool can serve multiple services. Request threads handle user requests. When
the server receives a request, it assigns the request to a free thread
from the thread pool. The thread executes the client's requests and returns results.
For example, if the request needs to use a system resource that is
currently busy, the thread waits until that resource is free before allowing the
request to use that resource.

Specify the minimum and maximum number of threads that are reserved for requests.
The thread pool is dynamically adjusted between these two values. The minimum thread
pool size that is specified signals the server to allocate at least that
many threads in reserve for requests. That number is increased up to the
maximum thread pool size that is specified.

Increasing the number of threads available to a process allows the process to
respond to more requests simultaneously.

For each thread pool, the following information is provided.

Thread Pool ID
The name of the thread pool.


Max Thread Pool Size
The maximum number of threads in the thread pool.


Min Thread Pool Size
The minimum number of threads in the thread pool. These threads are created when the thread pool is instantiated.


Max Queue Size
The maximum number of messages that can be queued until threads are available to process them.


Idle Thread Timeout
The amount of time in seconds after which idle threads are removed from the pool.



The Thread Pools table also contains the following options.

New
Button to create a new thread pool.


Delete
Button to delete one or more selected thread pools.



Related Tasks

To Create a Thread Pool


To Edit a Thread Pool


To Delete a Thread Pool


Related asadmin Commands

create-threadpool(1)


list-threadpools(1)


delete-threadpool(1)




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