CORBA 2.6 Programmer's Guide for C++

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.
●
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.
●
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.
●
If your application performs thread-blocking operations, write a multithreaded server to increase
the number of threads per process.
●
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.
●
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.
●
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 NonStop TS/MP
System Management Manual.