HP Integrity NonStop H-Series - Manual (Page 241)

Configuring httpd Processes to Handle Maximum Load
The httpd processes are configured using the Server configuration directive in the <iTP
WebServer deployment directory>/conf/httpd.config file on OSS. The Server
directive controls the creation of the PATHMON environment, where the webserver runs.
A typical default configuration of the httpd process of the iTP WebServer appears as follows:
Server $root/bin/httpd {
eval $DefaultServerAttributes
CWD [pwd]
Arglist -server [HTTPD_CONFIG_FILE]
Env TANDEM_RECEIVE_DEPTH=50
Priority 170
Numstatic 5
Maxservers 50
MapDefine =TCPIP^RESOLVER^NAME /G/system/ztcpip/resconf
MapDefine =TCPIP^PROCESS^NAME $transport
}
The number of httpd processes are governed by the following TS/MP attributes:
• Numstatic : This specifies the number of static servers running under PATHMON. The
static processes run on the system, irrespective of the load.
• Maxservers : This specifies the maximum number of server processes that can run under
PATHMON.
• TANDEM_RECEIVE_DEPTH : This specifies the capacity of each of the configured httpd
processes.
• ( Maxservers – Numstatic ): The difference denotes the number of dynamic servers. A
dynamic server is a need-based server. When the iTP WebServer is under heavy load and
all the static
httpd processes are busy, a dynamic server process, httpd , is created to
support the excess load. These servers are dynamically created by TS/MP and are terminated
once the process is complete.
The capacity of the iTP WebServer environment can be summarized as:
• The static capacity of iTP WebServer is [Numstatic X TANDEM_RECEIVE_DEPTH] .
• The dynamic capacity is [(Maxservers – Numstatic) X TANDEM_RECEIVE_DEPTH]
requests.
• The total capacity of iTP WebServer is [Maxservers X TANDEM_RECEIVE_DEPTH] .
Example 1:
Assume that the httpd process of the iTP WebServer has the following configurations:
Server $root/bin/httpd {
eval $DefaultServerAttributes
CWD [pwd]
Arglist -server [HTTPD_CONFIG_FILE]
Env TANDEM_RECEIVE_DEPTH=100
Priority 170
Numstatic 5
Maxservers 50
MapDefine =TCPIP^RESOLVER^NAME /G/system/ztcpip/resconf
MapDefine =TCPIP^PROCESS^NAME $transport
}
When you start the iTP WebServer, five static httpd processes will be started, governed by
the value of Numstatic . Because the value of TANDEM_RECEIVE_DEPTH is set to 100, each
NonStop Platform Configurations 241