CMPMIPS start option


                       (1)             
   .-CMPMIPS--=--100---------------.   
>>-+-------------------------------+---------------------------><
   '-CMPMIPS--=--compression_ratio-'

Notes:

The CMPMIPS start option is meaningful only if the value for CMPVTAM is greater than 1.

range:

0–100

Used by VTAM® to determine the amount of time the adaptive compression tables are in adaptive mode versus being static:

When an adaptive data compression table is in adaptive mode, CMPMIPS is used to determine the amount of time the compression table remains in adaptive mode before becoming static. When a compression table is static, no new entries are made to the table.
When an adaptive data compression table is static, CMPMIPS is used to calculate the lowest compression efficiency rate that a session must maintain to keep the compression tables static.

The higher the value specified, the greater the amount of time spent in adaptive mode. The lower the value, the sooner a compression table becomes static.

You can change the value of CMPMIPS with the MODIFY VTAMOPTS command while VTAM is running.

Note:

Adaptive mode uses CPU cycles; a static table does not use CPU cycles. However, when a table is static, compression efficiency decreases.
If CMPMIPS=0, no compression processing is performed.
If CMPMIPS=100, adaptive mode compression is continuous and the compression table is never static.
CMPMIPS=50 provides the most effective beginning balance between compression efficiency and CPU usage.