HP Integrity NonStop H-Series - Manual (Page 310)

the five static processes can handle 100 requests. In this example, the capacity of the iTP
WebServer environment can be summarized as follows:
— The static capacity of iTP WebServer is [ Numstatic X TANDEM_RECEIVE_DEPTH ]=
500.
— The dynamic capacity is [(Maxservers – Numstatic) X
TANDEM_RECEIVE_DEPTH] = 4500.
— The total capacity of iTP WebServer is [Maxservers X TANDEM_RECEIVE_DEPTH] =
5000.
Using this configuration, the iTP WebServer can handle 500 simultaneous requests statically.
When it receives the 501st request, a dynamic
httpd process is created, which functions as
a normal httpd process. The capacity of each of the dynamic httpd processes is the value
of TANDEM_RECEIVE_DEPTH . When the load decreases, the dynamic httpd processes goes
down.
For more information on the Server configuration directive of the iTP WebServer, see the
iTP Secure WebServer System Administrator's Guide.
Guidelines for Configuring the Server Directive
Before configuring the various attributes of the Server directive, you must determine the
following parameters:
— Processors for httpd Processes
— Application parameters: Average Load, Peak Load, and Average Response Time
Processors for httpd Processes
When you start the iTP WebServer, the static httpd processes equal to the value of
Numstatics are started on your NonStop system. By default, all the configured processors
are taken into account. If the value of Numstatic is set to n , and the number of configured
processors on the system are equal to n , one static httpd process is started on each of the
processors. However, if the value of Numstatic is less than the number of configured
processors, one static httpd process starts on some of the processors, while the remaining
processors will not have any static httpd process.
You can determine the processors on which you intend to start httpd processes and configure
the processors directive. The following example will help you understand this better:
Example:
Assume that you have a 16-processor system and you want to start httpd processes on
processors 0, 1, 2, 3, 4, 5. For this, the processors configuration attribute must be configured
as processors 0 1 2 3 4 5.
In this scenario:
— If you set the value of Numstatic equal to 6, each of the processors 0, 1, 2, 3, 4, 5 will
have one static httpd process.
— If you set the value of Numstatic equal to a multiple of 6, each of the processors 0, 1,
2, 3, 4, 5 will have (Numstatic/6) static httpd processes.
— If you set the value of Numstatic equal to 5, any 5 of the processors 0, 1, 2, 3, 4, 5 will
have one static httpd process, and remaining processors will not have any httpd
process.
— If you set the value of Numstatic equal to 9, any three of the processors 0, 1, 2, 3, 4, 5
will have two static httpd process and each of the remaining three processors will have
one httpd process.
310 Configuring Hibernate Applications on NonStop Systems