Throughput, CPU & memory over time

Interactive per-run and averaged time series from the six-broker matrix: producer throughput, broker CPU and broker working-set memory over each run window, Crabka against Strimzi. Every thin line is one run; the bold line is the across-run mean.

These charts come from the same harness as the Crabka vs Strimzi comparison. Two six-broker clusters at RF=3 run on one GKE node pool with byte-for-byte identical pod resources. The same Rust load driver, crabka-bench-driver, runs each scenario over the Kafka wire protocol. The harness runs each cell ten times. The driver samples client throughput and latency every two seconds, and it scrapes broker CPU and working-set memory from Prometheus across the run window.

How to read these

Each scenario has three charts: throughput, broker CPU, and broker memory. Each chart plots the value over the run window.

• Thin lines are individual runs, one line per repeat. They show the run-to-run spread directly instead of one number.
• Bold lines are the mean across all runs at each time offset.
• Orange is Crabka, blue is Strimzi. Click a legend entry to toggle a stack.

The summary bars at the top are the end-of-run aggregates. The bar is the mean across runs. The error bar is the run-to-run sample standard deviation, so a short error bar shows a stable and repeatable result.

Methodology

• Both stacks get identical pod resource requests/limits, the same storage class, the same partition counts, and the same in-cluster driver; brokers run one cluster at a time.
• Throughput is the driver's own produce/consume rate. Broker CPU is the summed cAdvisor CPU usage in cores across the broker pods. Broker memory is the summed cgroup working set (container_memory_working_set_bytes).
• The means and the standard deviations come from the ten repeats per cell. The charts average the time series per two-second offset, so a curve shows the typical shape of a run and not one single run.
• The full harness, the scenarios, and the aggregator are in bench/. Use crabka-bench-report --web-fragment to regenerate the charts on this page.