TS/MP System Management Manual (G06.24+, H06.03+)

Maintaining a PATHMON Environment
NonStop TS/MP System Management Manual—541819-001
5-25
Links and PATHMON Performance
messages and text messages to $0 because although the LOG2 command did not
specify the EVENTFORMAT parameter, the LOG1 command did.
Links and PATHMON Performance
A link is managed and owned by the the PATHMON process that controls the server
process. To perform link management, PATHMON maintains status information for
SERVER objects as well as LINKMON processes. If your environment includes the
Pathway/iTS product, the PATHMON process also maintains status information for
TCP and TERM objects.
By understanding how PATHMON manages links and what causes dissolution of links,
you can take steps to improve the performance of your system.
This can adversely affect PATHMON performance under exception conditions such as
network or processor failure:
•
Maintaining object status to manage links.
To manage links, the PATHMON process maintains status information about
PATHMON-controlled objects and LINKMON processes. During exception
conditions, managing communication between these objects and server processes
can slow the PATHMON process’ response time to other commands (from
PATHCOM or SPI).
•
Creating and deleting links.
If the PATHMON process is configured so that it is constantly creating and deleting
links, the server may wait for processor cycles, causing incoming transactions to
be placed on the server-class wait queue.
For more information about PATHMON performance and steps you can take to
improve it, see Managing PATHMON Process Performance on page 5-26.
Understanding the Causes of Link Dissolution
A PATHMON process, LINKMON or TCP process, or a server process (indirectly) can
delete a link. This table describe how a link manager can cause deletion of a link.
Note. If the log file is running but is temporarily unavailable or overloaded, the PATHMON
environment may slow down.