Use this command when running the SVTSUTIL program to generate a report showing the effective CPU cost for using hardware compression in the DASD buffer for a generated data sample. The CA Vtape compression routines rely on the use of certain hardware instructions. This report can estimate how much additional CPU overhead is required to compress data using these hardware instructions.
ANALYZE=COMPRESSION
The additional CPU cost is expressed in terms of megabytes (MBs) for each CPU second. This reflects the amount of data the hardware compression instructions themselves can move. Use the report information to estimate the additional CPU cost for hardware compression that is based on the number of MBs of data to process.
You can also use this report to determine how to adjust the MaximumCPURate parmlib attribute. This attribute can reduce or increase the additional CPU cost by reducing or increasing the amount of data compressed. By reducing the amount of data that is compressed, CPU cost can be reduced.
The analysis report tends to vary on different physical machines due to the hardware implementation of the compression instructions.
Sample report output
CA Vtape 12.6 S V T S U T I L - Snnn.SVT1 - dddddddd mmm dd, yyyy hh.mm.ss --------------------------- Utility Control Statement(s) & Report Log --------------------------- SVTSU0171I ANALYZE=COMPRESSION Compression Call Performance Analysis Type Method MB/Inp CpuSec MB/Sec -------- -------- ------ ------ ------ CMPSC SVTHC#01 25 .127 201 CMPSC SVTHC#02 25 .118 216 CMPSC SVTHC#03 25 .105 243 CMPSC SVTHC#04 25 .105 243 CMPSC SVTHC#05 25 .114 224 Average Velocity mb/Sec 225 SVTSU0172I ANALYZE=COMPRESSION SVTSUT60,RC=00 SVTSU0173I Number of commands processed: 1 SVTSU0174I Highest condition code: 0
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