TS/MP 2.5 System Management Manual

7 Tuning Your System by Using Statistics
This section describes statistics collected for server processes. These statistics are collected when
you run the STATS SERVER command. See the description of the “STATS SERVER Command”
(page 202).
This section is divided into two parts:
• The first part describes server process performance statistics that the ACS subsystem processes,
and the TCP collect.
• The second part describes server process performance statistics collected only by the TCPs.
Because TCPs are provided by the Pathway/iTS product, you can display these server statistics
only if your environment includes the Pathway/iTS product.
You can use the statistics generated by transaction processing functions in the PATHMON
environment to detect bottlenecks within the ACS subsystem processes or—if you have
Pathway/iTS—the TCP. Based on careful analysis of these statistics, you can reconfigure your
PATHMON environment to eliminate some performance degradations.
Other factors affecting system performance are not represented in these statistics. Such factors
generally involve contention for system resources, for example, the ability of the PATHMON process
to grant links promptly.
Statistics produced by the NonStop operating system can shed light on the performance of these
types of functions. For more information about statistics produced by the operating system, see the
Measure User’s Guide and the Measure Reference Manual.
Server Statistics Collected by the ACS Subsystem Processes and the TCP
ACS subsystem processes and TCPs gather statistics for a single server class or for multiple server
classes. The statistics are gathered by:
• ACS subsystem processes with links to a server process in the class
• TCPs that open a server process in the class—but only if these TCPs are configured with the
STATS parameter set to ON
Server statistics show the amount of link manager resources used to communicate with a server
class. Server statistics collected by ACS subsystem processes and TCPs provide information about:
• Server-class wait queue (QUEUE INFO)
• Input and output operations (I/OþINFO)
Example 20 (page 118) shows a sample set of server statistics gathered by a TCP (TCP1) and a
ACS subsystem process (LM1).
Server Statistics Collected by the ACS Subsystem Processes and the TCP 117