Pathway/XM System Management Manual

PXMCFG Statements and PXMCHK Utility
Compaq NonStop™ Pathway/XM System Management Manual—426761-001
10-73
SET TCP
SWAP $volume
specifies the Guardian name of the disk volume for the temporary file used for
swapping the TCP extended data segment.
Defaults for file name expansion are based on the value of the DEFAULT attribute
of the associated NODE object.
TERMBUF bytes
specifies the maximum number of bytes that a TCP allocates from the TERMPOOL
area for its terminal output buffers. (This allocation has no effect on terminal input
operations.)
The value for bytes is a value from 256 to the value of the TERMPOOL attribute.
If you enter a value for TERMBUF that is less than 256, the PATHMON process
automatically adjusts the value to 256. If you omit this attribute, the default is 1500
bytes.
If you are writing diagnostic display messages to the terminal, bytes should be a
value from 1315 to the value of the TERMPOOL attribute. Diagnostic display
messages are not written to the terminal if the value is less than 1315.
Defining a large value for this attribute might decrease the number of terminals able
to operate simultaneously or increase the number of times an I/O operation is
delayed until space for a buffer becomes available. Small values tend to increase the
number of output operations necessary to perform certain functions (for example,
the execution of the SCREEN COBOL DISPLAY BASE statement). These buffers,
like any pool buffer, are held only for the time required to perform the terminal I/O
operation.
For a TCP that runs the gateway requester program to support Pathway/iTS web
clients, specify a value of 32000.
TERMPOOL bytes
specifies the number of bytes that a TCP allocates in its data area for all terminal I/O
buffers.
The value for bytes is the minimum number of bytes that the TCP allocates for the
pool size. If you omit this attribute, the default is 10000.
Calculate an appropriate TERMPOOL value for your configuration by multiplying
the number of TERMs by the size of the largest terminal input buffer plus the largest
UMP message. For example, with 100 TERMs, a largest terminal input buffer of
1000 bytes and a largest UMP message of 1000 bytes, set the TERMPOOL value to
200k bytes (100*(1000+1000)=200k).
If you specify a smaller value for TERMPOOL than the above calculation would
provide, make sure to specify a SET TCP TERMPOOL value of at least 25 bytes
Note. TERMBUF is not relevant to verbs (for example, the SEND MESSAGE verb) used
with the IDS facility.