Ice.ThreadPool.*
A communicator creates two thread pools: the client thread pool processes AMI callbacks and incoming requests on bidirectional connections, and the server thread pool dispatches requests to object adapters.
This page describes configuration properties for the client and server thread pools. These thread pools are named Client and Server, respectively. In the property descriptions below, replace name with Client or Server.
On this page:
Ice.ThreadPool.name.Serialize
Synopsis
Ice.ThreadPool.name.Serialize=num
Description
If num is a value greater than 0, the Client or Server thread pool serializes all messages from each connection. It is not necessary to enable this feature in a thread pool whose maximum size is 1 thread. When a thread pool processes requests implemented with AMD, it serializes the dispatching of requests from each connection, but it does not wait for a request to complete before it processes the next request.
In a multi-threaded pool, enabling serialization allows requests from different connections to be dispatched concurrently while preserving the order of messages on each connection. Note that serialization can have a significant impact on latency and throughput. If not defined, the default value is 0.
Ice.ThreadPool.name.Size
Synopsis
Ice.ThreadPool.name.Size=num
Description
Thread pools in Ice can grow and shrink dynamically, based on an average load factor. A thread pool always has at least 1 thread and may grow as load increases up to the maximum size specified by Ice.ThreadPool.name.SizeMax. If SizeMax is not specified, Ice uses the value of num as the pool's maximum size. The Client or Server thread pool is initialized with num active threads, but the pool may shrink to only 1 thread during idle periods as determined by Ice.ThreadPool.name.ThreadIdleTime.
If not specified, the default value is 1 for both properties.
An object adapter can also be configured with its own thread pool.
Note that multiple threads for the client thread pool are only required for nested AMI invocations, or to allow multiple AMI callbacks to be executed concurrently.
To monitor the thread pool activities of the Ice run time, enable the Ice.Trace.ThreadPool property.
Ice.ThreadPool.name.SizeMax
Synopsis
Ice.ThreadPool.name.SizeMax=num
Description
num is the maximum number of threads for the Client or Server thread pool. Refer to the Ice.ThreadPool.name.Size property for more information on configuring the size of a thread pool.
The default value for SizeMax is the value of Size, meaning the thread pool can never grow larger than its initial size.
To monitor the thread pool activities of the Ice run time, enable the Ice.Trace.ThreadPool property.
Ice.ThreadPool.name.SizeWarn
Synopsis
Ice.ThreadPool.name.SizeWarn=num
Description
Whenever num threads are active in the Client or Server thread pool, a "low on threads" warning is printed. The default value is 0, which disables the warning.
To monitor the thread pool activities of the Ice run time, enable the Ice.Trace.ThreadPool property.
Ice.ThreadPool.name.StackSize
Synopsis
Ice.ThreadPool.name.StackSize=num
Description
num is the stack size (in bytes) of threads in the Client or Server thread pool. The default value is 0, meaning the operating system's default is used.
Ice.ThreadPool.name.ThreadIdleTime
Synopsis
Ice.ThreadPool.name.ThreadIdleTime=num
Description
Ice can automatically reap idle threads in the Client or Server thread pool to conserve resources. This property specifies the number of seconds a thread must be idle before it is reaped. If not specified, the default value is 60 seconds.
The threads in Ice thread pools are assigned jobs at random, and this randomness affects how quickly a thread in an under-utilized thread pool will get reaped.
To disable the reaping of idle threads, set ThreadIdleTime to 0. In this situation, the thread pool is initialized with Ice.ThreadPool.name.Size active threads and may grow to contain Ice.ThreadPool.name.SizeMax active threads, but the size of the pool never decreases.
To monitor the thread pool activities of the Ice run time, enable the Ice.Trace.ThreadPool property.
Ice.ThreadPool.name.ThreadPriority
Synopsis
Ice.ThreadPool.name.ThreadPriority=num
Description
num specifies a thread priority for the threads in the Client or Server thread pool. Leaving this property unset causes the run time to create threads with the default priority specified by Ice.ThreadPriority.
This property is unset by default.
You can also override the default priority for a specific object adapter using adapter.ThreadPool.ThreadPriority.