giltene/wrk2

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

4626 stars · 425 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

wrk2 is a constant-throughput HTTP benchmarking tool based on wrk, modified to produce accurate latency recordings using HdrHistograms. It avoids Coordinated Omission by measuring latency from the planned send time, enabling accurate high-percentile (up to 99.9999%) latency reporting.

Use cases

• load test an HTTP API at a fixed requests-per-second rate
• measure accurate tail latencies like 99.99th percentile for a web service
• benchmark a server without Coordinated Omission skewing results
• compare latency of endpoints under constant throughput load
• script HTTP load tests with Lua request generation

When to choose

• you need correct high-percentile latency numbers rather than averages
• you want constant-throughput load generation instead of open-loop max load
• you are already familiar with wrk and want more accurate latency recording

When to avoid

• you need sub-millisecond latency precision (accuracy is limited to ~1 msec granularity)
• you need load testing of non-HTTP protocols
• you want a actively developed tool with frequent updates

Facets

cli-tool · maturity maintenance

benchmarking http-client load-testing developer-tools performance testing web-development cli http-benchmarking hdrhistogram coordinated-omission latency-measurement load-generator linux macos

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