Add --flamegraph flag for folded stack profile output#640
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stephenamar-db merged 1 commit intomasterfrom Mar 6, 2026
Merged
Add --flamegraph flag for folded stack profile output#640stephenamar-db merged 1 commit intomasterfrom
stephenamar-db merged 1 commit intomasterfrom
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Introduces a FlameGraphProfiler that records Jsonnet call stacks in Brendan Gregg's folded stack format, suitable for generating flame graphs. The profiler hooks into the existing stack depth tracking in the Evaluator, pushing/popping frame names alongside depth checks. Usage: sjsonnet --flamegraph profile.txt input.jsonnet Then: flamegraph.pl profile.txt > profile.svg
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cool, I was want to do that too |
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Summary
--flamegraph <file>CLI flag that writes a flame graph profile in Brendan Gregg's folded stack formatFlameGraphProfilerthat hooks into the existingEvaluatorstack depth tracking, pushing/popping frame names at everyApply,ApplyBuiltin, import, comprehension, and object field evaluationflamegraph.pl profile.txt > profile.svgTest plan
sjsonnet.jvm[3.3.7].testpasses (140/140)sjsonnet.jvm[2.13.18].compilepassessjsonnet --flamegraph /tmp/profile.txt <input>.jsonnetproduces valid folded stack output