CPU loads for ECM nodes

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The CPU loads for a single ECM node versus an ECM cluster were compared across the SUT load levels.

Figure 1 shows the CPU loads for the individual ECM nodes. For the ECM cluster, the CPU loads were displayed as stacked.

Figure 1. ECM CPU loads: single ECM node versus ECM cluster

This graphic provides an overview of how the ECM CPU loads vary with a single node versus a multiple node cluster

Observations

  • At the low load level, the CPU load used 5.2 IFL processors for the single ECM node and 6.7 IFL processors for the ECM cluster.
  • At the high load level, the CPU load was around 20 used IFL processors for both node setups.
  • The differences between the CPU load became less at the higher ECM node load levels.
  • At the highest load level, the CPU load was equal for the single ECM node and for the ECM cluster.

Conclusion

At the lower load levels, the ECM cluster appeared to consume slightly more CPU compared with the single ECM node. However, the additional CPU usage became insignificant when we looked at the average ICN transaction response times:
  • The average ICN response times were much better for the ECM cluster across the complete load level bandwidth.
  • The CPU usage was equal at the highest load level for both setups, but the ECM cluster response time was outstanding compared to the single ECM node.
  • At the higher load level, using the ECM cluster was shown to be highly advantageous in transaction performance at the same CPU cost.