MVS 3.8J
IKJPRM00

IKJPRM00 - TIOC parameters used to control TSO/TCAM time sharing buffers.

 

Parameter in IEASYSxx

NONE

Notes

  1. Optional member used to control TSO/TCAM time sharing buffers.

  2. Not used by system initialization.

Syntax

  • Each record must start with the word TIOC, followed by a blank.

  • For each record, columns 1 through 71 are valid for data.

  • A parameter must be complete in a record, it may not cross record boundaries.

  • A parameter may be repeated, only the last occurrence is accepted.

  • A comma or blank must separate adjacent keywords.

  • Invalid or misspelled parameters are ignored and default values are substituted.

Parameters

Parameter Meaning and Use Valid Range Default Value
BUFSIZE

Specifies the storage size of a TIOC buffer.

 

 20-252 64
BUFFERS Specifies the number of buffers in the TIOC buffer pool. 4-32,768

six times the

USERMAX

value

 
INLOCKHI

Specifies the number of TIOC buffers to be allocated to a terminal user for input before his keyboard is locked.

 

INLOCKHI must be large enough to permit TIOC to receive the largest possible legitimate input message sent from any terminal in the system.

 

 1-32,768 4
INLOCKLO Specifies a low threshold of allocated input buffers.  When the number of allocated input buffers is reduced to or below this number, the user's keyboard is unlocked.

less than

INLOCKHI

and

BUFFERS

 

 1
OWAITHI

Specifies the maximum number of output buffers than can be allocated to a terminal.  When that number is reached, the users' address space is placed in output wait and is swapped out of real storage.

 

 1-32,767 20
OWAITLO Specifies a low threshold value for the number of allocated output buffers.  When the number of output buffers reaches this value, the system resource manager is notified that the terminal user's job can be swapped into storage and allowed to execute.

less than

OWAITHI

and

BUFFERS

 

 4
RECONLIM

Specifies the time limit in minutes within which a user may reconnect after his TP line has been disconnected.

 

 0-32,767 0
RESVBUF Specifies the minimum number of free buffers that are available.  Its purpose is to maintain a reserve of free buffers that can handle output without bottlenecking the system.  If the number of free buffers falls below this value, all terminals are locked for input, regardless of INLOCKHI value.  The terminals will be unlocked when the number of free buffers becomes equal to RESVBUF.

1 - value of

BUFFERS

10% of the

number of

buffers

specified

in BUFFERS

parameter.

 
USERMAX Specifies the maximum number of time sharing users that may be logged on. 1-32,767

Total number

of terminals

that support

time sharing

plus 10%.