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We are using AWS ElastiCache for Redis for our application, and we need some help in understanding the metrics. During high load, we saw a CPU utilization of 30%, But Engine CPU Utilization was showing almost 80%. Could someone please elaborate on the difference between these metrics and what are the optimum limits for those metrics for a better performance.

Thanks in advance.

LeoMurillo
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techy
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1 Answers1

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Now I got a better understanding of both the metrics. When it is CPU Utilization, it is total cpu utilization of that system. And Engine Utilization is specific to the redis process thread which handles all the redis queries. So in a system with 4 cores, as we all know redis processing happens in a single thread, only one core will be used by the redis for processing the queries. So in that case the maximum CPU Utilization by redis will be 25 %.

techy
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    Official explanation here: https://aws.amazon.com/about-aws/whats-new/2018/04/amazon-elastiCache-for-redis-introduces-new-cpu-utilization-metric-for-better-visibility-into-redis-workloads/ – kenske Sep 18 '20 at 21:15