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Results of Demos 1 & 2

Opposite are extracts from the JES Job Log for both of the previous demonstrations.

The differences to note are:.

• Elapse time for the job processing blocked records is reduced by 2m 35s, compared to the unblocked record processing.
  
  
• There is a significant reduction in the number of I/O operations in both the second (S0020) and third (S0030) job steps.
  
  
• There is also a reduction in CPU time when processing blocked records.

Demonstration results.

Processing unblocked records

10.46.43 JOB05630  IEF403I LEGTRSP1 - STARTED - TIME=10.46.43
10.46.43 JOB05630  -                                         
10.46.43 JOB05630  -STEPNAME PROCSTEP    RC   EXCP   CONN    
10.46.43 JOB05630  -S0010                00     11      0    
10.48.49 JOB05630  -S0020                00   500K      0    
10.49.22 JOB05630  -S0030                00   1017      0    
10.49.22 JOB05630  IEF404I LEGTRSP1 - ENDED - TIME=10.49.22 TOTAL TCB CPU TIME=      .28                                                                                                                                 

Processing blocked records

10.52.34 JOB05631  IEF403I LEGTRSP2 - STARTED - TIME=10.52.34
10.52.34 JOB05631  -                                         
10.52.34 JOB05631  -STEPNAME PROCSTEP    RC   EXCP   CONN    
10.52.34 JOB05631  -S0010                00     11      0    
10.52.36 JOB05631  -S0020                00   1147      0    
10.52.38 JOB05631  -S0030                00    155      0    
10.52.38 JOB05631  IEF404I LEGTRSP2 - ENDED - TIME=10.52.38 TOTAL TCB CPU TIME=      .02                                                                                                                                 

The reduction in CPU time is due to the fact that the CPU is used to drive each I/O request (EXCP) and as can be seen fewer such requests occur.