NonStop Servlets for JavaServer Pages (NSJSP) 7.0 System Administrator's Guide

Managing NSJSP
NonStop Servlets for JavaServer Pages (NSJSP) 7.0 System Administrator’s Guide—674372-005
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NSJSP Manager Operations
The Server Class Statistics page provides the following information:

Server class link wait queue (Queue Info)
The link manager sends requests to the server class process through links. A
request is placed in a link queue if it is not possible to immediately send the
request to a server class process due to unavailability of a link. The request
resides in the link wait queue until a free link is available or the link manager
obtains a new link to a server class process from the PATHMON.
More number of requests residing in the link wait queue indicates a need of
increasing the number of server class processes (NUMSTATIC) or the number of
links per server class (MAXLINKS/LINKDEPTH). As a result, less number of
requests will wait in the link wait queue, thereby improving the system response
time.

Input or output operations (I/O Info)
It is the information about I/O operations to and from a server class. A send
operation is a message sent from the link manager to a server class process. A
reply operation is a message received by the link manager from a server class
process.
When an HTTPD process communicates with NSJSP, a single HTTPD message
sent to an NSJSP process results in multiple send operations from the link
manager to the process. This is because of the limitation on the maximum number
of bytes that can be sent in one send operation. Similarly, a single HTTP response
from the NSJSP Server Class process might result in multiple outgoing messages
between the process and the link manager.
Table 4-20 lists GUI the server class statistics.
Note. The communication between an HTTPD process and an NSJSP Server Class
process need not always happen through a link manager. If the session based load
balancing is turned on, HTTPD processes communicate with the NSJSP Server Class
processes directly through file system calls. In such a case, the link manager counters on
this page are not incremented.
Table 4-20. Server Class Statistics (page 1 of 2)
Attribute Description
Queue Info
Request Count Total number of requests for a link that were not satisfied
immediately.
% Waits Percentage of requests indicated by the Request Count value
waited in the link wait queue before it was serviced.
Maximum Waits Maximum number of requests that were queued in the link
manager queue.
Average Waits Average number of requests that were waiting.