CORBA 2.3.3 Programmer's Guide for C++ (NonStop CORBA 2.3.3+)

Configure application server processes as server pools. NonStop CORBA then uses the capabilities
of TS/MP to spread the workload among multiple processes, adds new processes as needed, and
provides load balancing.
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Configure the Comm Server, LSD, ILSD, and/or BSD processes in your NonStop CORBA system
to use Parallel Library TCP/IP, so that a single TCP/IP port is shared by multiple communications
processes.
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Increase the number of Comm Server processes to support increased request traffic.●
Add multiple instances of NonStop TCP/IP to the NonStop CORBA system to provide additional
external port connections.
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If your application performs thread-blocking operations, write a multithreaded server to increase
the number of threads per process.
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Using Stateless Objects and Server Pools
NonStop CORBA uses TS/MP server pools (called server classes in TS/MP documentation) internally
for many of its own processes. In addition, you can write your own applications to take advantage of
server pools. A server pool lets your application scale across processes to increase capacity. It also
increases throughput by creating new server processes when existing ones are blocked by
process-blocking operations, such as access to databases.
To obtain the scalability and throughput advantages of server pools, you must write your applications to
use stateless objects. You can address a stateless object within a server pool with a single object
reference, as if it were one logical object, regardless which server process it resides in. This capability
gives server pools an advantage over multiple stand-alone servers.
Writing Your Application to Use Server Pools
To use server pools, you do the following in your application:
In profile@ORB for the server, set tsmp_server to true and specify a PATHMON process
name and a server-class name.
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In the POA in the CORBA server application, ensure that the proprietary state policy has a value of
STATELESS. You can do this either by setting the lifespan policy to PERSISTENT or by directly
setting the state policy to STATELESS.
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Note
The use of server pools provides a number of other advantages, including availability, automatic load
balancing, and process management (allowing the operator to configure, monitor, start, and stop
processes). For further information, refer to the TS/MP System Management Manual.