This report presents information regarding the content of each cluster, including the number of both normal and outlying observations, the statistical summary of each cluster feature, and the usage summary of each of the reporting element. The report is normally used to better understand how the sample data is distributed among the clusters, how each cluster is actually functioning, and what data values are represented by each cluster. If Sparse Clusters are not included, then a separate report is produced at the bottom depicting those clusters that were excluded and their respective populations.
Workload Characterization Analysis 1 Cluster Population Summary For: Tuesday, July 1, 2003 _________________________________________________ Cluster: 1 ____________________________________________________ Radius: 0.00 Clustering Index: 0.00 Maximum Cluster Radius: 3.0 STDs Normal Obs.: 1 0.05% Observations << 97.5 Pct. Outlying Obs.: 13 0.65% Observations >> 97.5 Pct. Total Obs.: 14 0.70% Cluster Feature Resources Feature Description Minimum Average Standard Maximum Total % of Value Value Deviation Value Value Total JOBTCBTM Job TCB CPU Time 165 6,232 7,031 18,090 87,253 61.43 TAPEUSE Tape Device Usage Indicator 0 0 1 2 3 3.13 Cluster Report Resources Feature Description Total % of Value Total JOBEDASD DASD EXCPS 45,230,910 64.98 JOBETAPE Tape EXCPS 1,354,117 2.47 JOBTOHRS Tape Occupancy Hours 4 2.86 JOBNLR Total Logical Writer Records 0 0.00 _________________________________________________ Cluster: 9 ____________________________________________________ Radius: 1.19 Clustering Index: 0.19 Maximum Cluster Radius: 3.0 STDs Normal Obs.: 1,840 92.00% Observations << 97.5 Pct. Outlying Obs.: 0 0.00% Observations >> 97.5 Pct. Total Obs.: 1,840 92.00% Cluster Feature Resources Feature Description Minimum Average Standard Maximum Total % of Value Value Deviation Value Value Total JOBTCBTM Job TCB CPU Time 0 3 6 41 5,753 4.05 TAPEUSE Tape Device Usage Indicator 0 0 0 0 0 0.00 Cluster Report Resources Feature Description Total % of Value Total JOBEDASD DASD EXCPS 7,715,579 11.08 JOBETAPE Tape EXCPS 0 0.00 JOBTOHRS Tape Occupancy Hours 0 0.00 JOBNLR Total Logical Writer Records 100,736 99.91 _________________________________________________ Cluster: 11 ____________________________________________________ Radius: 1.44 Clustering Index: 0.79 Maximum Cluster Radius: 3.0 STDs Normal Obs.: 31 1.55% Observations << 97.5 Pct. Outlying Obs.: 0 0.00% Observations >> 97.5 Pct. Total Obs.: 31 1.55% Cluster Feature Resources Feature Description Minimum Average Standard Maximum Total % of Value Value Deviation Value Value Total JOBTCBTM Job TCB CPU Time 46 84 26 130 2,593 1.83 TAPEUSE Tape Device Usage Indicator 0 0 0 0 0 0.00 Sparse Clusters Have Been Excluded
Workload Characterization Analysis 2 Cluster Population Summary For: Tuesday, July 1, 2003 _________________________________________________ Cluster: 11 ____________________________________________________ Radius: 1.44 Clustering Index: 0.79 Maximum Cluster Radius: 3.0 STDs Normal Obs.: 31 1.55% Observations << 97.5 Pct. Outlying Obs.: 0 0.00% Observations >> 97.5 Pct. Total Obs.: 31 1.55% Cluster Report Resources Feature Description Total % of Value Total JOBEDASD DASD EXCPS 563,173 0.81 JOBETAPE Tape EXCPS 0 0.00 JOBTOHRS Tape Occupancy Hours 0 0.00 JOBNLR Total Logical Writer Records 0 0.00 _________________________________________________ Cluster: 13 ____________________________________________________ Radius: 1.71 Clustering Index: 0.66 Maximum Cluster Radius: 3.0 STDs Normal Obs.: 12 0.60% Observations << 97.5 Pct. Outlying Obs.: 0 0.00% Observations >> 97.5 Pct. Total Obs.: 12 0.60% Cluster Feature Resources Feature Description Minimum Average Standard Maximum Total % of Value Value Deviation Value Value Total JOBTCBTM Job TCB CPU Time 105 160 22 180 1,921 1.35 TAPEUSE Tape Device Usage Indicator 1 1 0 1 12 12.50 Cluster Report Resources Feature Description Total % of Value Total JOBEDASD DASD EXCPS 530,916 0.76 JOBETAPE Tape EXCPS 3,504,873 6.39 JOBTOHRS Tape Occupancy Hours 8 5.66 JOBNLR Total Logical Writer Records 0 0.00 _________________________________________________ Cluster: 14 ____________________________________________________ Radius: 2.02 Clustering Index: 0.72 Maximum Cluster Radius: 3.0 STDs Normal Obs.: 46 2.30% Observations << 97.5 Pct. Outlying Obs.: 0 0.00% Observations >> 97.5 Pct. Total Obs.: 46 2.30% Cluster Feature Resources Feature Description Minimum Average Standard Maximum Total % of Value Value Deviation Value Value Total JOBTCBTM Job TCB CPU Time 0 19 23 84 884 0.62 TAPEUSE Tape Device Usage Indicator 1 1 0 1 46 47.92 Cluster Report Resources Feature Description Total % of Value Total JOBEDASD DASD EXCPS 1,984,232 2.85 JOBETAPE Tape EXCPS 1,053,286 1.92 JOBTOHRS Tape Occupancy Hours 5 3.29 JOBNLR Total Logical Writer Records 88 0.09 Sparse Clusters Have Been Excluded _______________________________________________________________________________________________________________________
Figure 15-27. Clustering Population Summary report There are several points to be made concerning the Population Summary. Cluster 1 contains 14 cases within a radius of 0. This is a special case that can occur when a small number of nearly identical observations reside together. Notice that while these 14 cases represent only 0.7% of the sample, they account for over 61% of TCB time and nearly 65% of all DASD EXCPs. Clearly, while these are exceptional cases, they must be appropriately addressed for any job class structure to be considered successful. Cluster 9 contains the majority of the batch work under study, and represents 92% of the cases in the sample. The average TCB time for jobs represented in the cluster is 3 seconds, with a maximum TCB time of 41 seconds being observed, and no tape devices utilized. Clearly, an installation could define a single job class with several initiators and ensure excellent service for such jobs. Cluster 11 represents jobs again requiring no tape devices, but using more TCB time. Such jobs could be treated in a manner similar to those represented in cluster 9, but fewer initiators would be required. An alternative might be to use the same job class that was used for jobs contained in cluster 9, but adjust the WLM Service class definitions to reduce service for these jobs. A review the service requirements should be made before making a final decision. The remaining clusters, 13 & 14 represent tape jobs that have heavier processor requirements. The classes and number of initiators assigned depend on tape drive availability and service requirements.
Workload Characterization Analysis 1 Cluster Population Summary For: Tuesday, July 1, 2003 The following clusters were determined to be 'sparse' in their population and have been excluded from processing. Cluster: Population: 2 2 3 2 4 2 5 5 6 2 7 2 8 6 10 6 12 7 15 3 16 7 17 6 18 7
Figure 15-27A. Clustering Population Summary: Sparse Clusters
The above report section simply presents those clusters that were "sparse" in population. An optional report on these clusters can be generated, but was not in this particular study.
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