This command is used 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 are capable of moving. Using information from this report, you can estimate the additional CPU cost for hardware compression 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 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 V2R00 S V T S U T I L - X E 6 1 - 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 13 .250 55 CMPSC SVTHC#02 14 .250 57 CMPSC SVTHC#03 15 .250 65 CMPSC SVTHC#04 15 .250 64 CMPSC SVTHC#05 14 .250 60 Average Velocity mb/Sec 60 SVTSU0172I ANALYZE=COMPRESSION SVTSUT60, RC= 0 SVTSU0173I Number of commands processed: 1 SVTSU0174I Highest condition code: 0
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