test(loki.process): Add benchmarks to test performance with a large number of stage.match components - #6879
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test(loki.process): Add benchmarks to test performance with a large number of stage.match components#6879csmarchbanks wants to merge 1 commit into
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…ages Adaptive-logs style configurations can compile down to a loki.process pipeline with hundreds of stage.match rules, and each stage hands entries off through its own unbuffered channel and goroutine. These benchmarks make that per-stage handoff cost measurable, for a single stream (BenchmarkPipelineManyRules), for one rule among many needing its own channel (BenchmarkPipelineOneMultilineAmongManyRules), and for many concurrent streams competing for the same cores (BenchmarkPipelineManyStreamsSaturated). Assisted-by: Claude Sonnet 5
This was referenced Aug 13, 2026
csmarchbanks
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August 13, 2026 15:05
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Brief description of Pull Request
Adds three benchmarks to
internal/component/loki/process/stages/pipeline_test.go, with no production code changes:BenchmarkPipelineManyRules— per-entry latency for a single stream through a pipeline built from a sweep ofstage.matchrule counts (1 to 1000).BenchmarkPipelineOneMultilineAmongManyRules— the same, with onestage.multilinerule mixed in at different positions among 1000 otherwise-uniform rules.BenchmarkPipelineManyStreamsSaturated— aggregate throughput (entries/sec) across many concurrent streams competing for the same cores, which is where the current one-goroutine-and-channel-per-stage cost shows up most under real load.Pull Request Details
We are trying to move adaptive logs into the client and ran into performance issues when there are lots of
stage.matchentries. This adds benchmarks for those cases so we can improve the performance.Notes to the Reviewer
This is the shared baseline that #6873 and #6875 (and a further change) each build on: every commit that follows on top of this one reports its own before/after
benchstatcomparison against this commit specifically.PR Checklist