TS/MP System Management Manual (H06.05+, J06.03+)

Configuring Objects in a PATHMON Environment
HP NonStop TS/MP System Management Manual—541819-007
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Understanding the Effects of Link Configuration
manager makes the server open available for use by multiple SCREEN COBOL
programs or Pathsend processes and user applications, respectively.
NUMSTATIC
The NUMSTATIC attribute specifies the maximum number of static servers within a
server class. Because it is recommended that you run your application with static
servers only, you should specify the same value for NUMSTATIC that you specify for
MAXSERVERS. This way, no dynamic servers should ever be required. If you use
this approach, you can allow the CREATEDELAY and DELETEDELAY attributes to
default, because they apply only to dynamic servers.
The value of MAXSERVERS minus the value of NUMSTATIC equals the number of
dynamic server processes in the server class. Because the default NUMSTATIC value
is zero, failing to supply a value for NUMSTATIC causes all server processes to be
dynamic. A configuration running only dynamic server processes is not recommended
because the PATHMON process does not apply load balancing algorithms to dynamic
server processes. Without load balancing, the first server process that starts up could
be overloaded. Thus, it is recommended that you supply a value for NUMSTATIC.
The maximum number of static links that a link manager, such as the LINKMON
process or the ACS subsystem processes, can have is determined by the formula
NUMSTATIC * LINKDEPTH.
CREATEDELAY and DELETEDELAY
CREATEDELAY is the length of time a send request queues before the link manager
asks for another link, assuming the link manager has determined that no more static
links are available (that is, only dynamic links are available).
A link manager will always ask for a link immediately if the link manager has
determined that static links are still available.
The DELETEDELAY attribute specifies the amount of time that a dynamic server sits
idle before the link manager returns the link to the PATHMON process.
For more information about static and dynamic servers, see Configuring Server
Classes.
Understanding the Effects of Link Configuration
Application performance often depends on how well links between requesters and
server processes are managed. If your application is configured in a way that creates
requester queuing problems or a bottleneck in server process responses, performance
suffers.
Note. Normally, only server programs that are coded as NOWAIT I/O should have a
LINKDEPTH value greater than 1. Setting the LINKDEPTH value greater than 1 for a WAITED
server class can lead to queueing at the server process and increased response time.