TS/MP Release Supplement

ACS Subsystem
HP NonStop TS/MP Release Supplement—546055-006
1-15
System Management Interface
Grouping long-running and short-running requests causes uneven response times and
increases the number of links needed to maintain transaction throughput. If an
application contains server programs that process both long and short-running
requests, configure the server program to use multiple server classes in PATHMON.
This separates the long and short-running requests into different queues. You can
modify requester programs to call one server class for long-running requests and
another server class for short-running requests.
For example, consider a server that can perform simple queries and database updates.
A database update operation is generally long-running while a query is short-running.
You can configure the same server class as two server classes and program the
requestor to send query requests to one server class and the database update
requests to the other. When all processes of a server class are performing the same
task, ACS can load balance the requests more effectively.
ACS takes the response time of a link into consideration while selecting the best
possible link from its pool of free links to satisfy a request. The new algorithm used for
link management might require more or fewer links to server processes while
maintaining the same transactional throughput. Therefore, to achieve optimum
performance, modify the PATHMON process configuration. To tune the PATHMON
configuration, follow the steps outlined in Section 3, Steps to Optimum Link
Configuration in the
TS/MP System Management Manual.
System Management Interface
There are no operational changes to the Subsystem Programmatic Interface (SPI) for
system management or to the SPI message format. The system management interface
in TS/MP 2.3 and later versions is the same as provided by TS/MP 2.0.
However, there are data changes. Some token values might contain different process
names, as follows:
•
TS/MP 2.0: The SPI interface returns the TS/MP link manager process name
$ZLnn.
•
TS/MP 2.3 and later versions: Link management is handled by both the ACS
subsystem process broker (
$ZPnn) and the redirector process ($ZLnn). Therefore,
the SPI interface returns either of these process names, depending upon which
process encounters the problem. This is particularly evident in the
STATUS
command.
On servers running TS/MP 2.3 or later version, the shutdown time for large Pathway
environments with many Pathsend requesters is slightly longer than that of TS/MP 2.0.