I am trying to achieve logging of extrinsic execution time traces on parachain nodes i run myself during block import. I'm doing this through tracing instead of by weights so that I can collect data on long-term trends in actual execution times on the actual mainnet TXN composition instead of benchmarking's worst-case assumption.

Looking through the docs, most references to in-runtime tracing are 12months or older.

I have found

My runtime forwards block building calls directly to executive, which runs init_tracing https://github.com/paritytech/substrate/blob/polkadot-v0.9.26/frame/executive/src/lib.rs#L435 so as long as sp-io is built with-tracing I get the PassingTracingSubscriber and should see log output of recorded spans from what I gather reading these docs.

I have tried RT cargo.toml

with-tracing = [

cargo b --release --features=with-tracing

But I cannot get any trace output to show up in the logs. Client-side Trace-level logs show normally when the bin is run with -ltrace:

2022-12-02 11:09:42.063 TRACE tokio-runtime-worker executor: [Parachain] Executing function method=BlockBuilder_apply_extrinsic
2022-12-02 11:09:42.069 TRACE tokio-runtime-worker executor: [Parachain] Executing function method=BlockBuilder_apply_extrinsic

I would expect these to be interspersed with the recorded spans from apply_extrinsic produced here.

Is sp-tracing still supported and am I missing something? e.g. some client-side configuration to receive/enable the traces from the PassingTracingSubscriber. I did find reference in the docs to having to call set_tracing_subscriber somewhere in the RT, but 0.9.26 substrate code does not seem to have this fn anymore.

One caveat with this chain (in case it's relevant) is that I do not have to option of using the native runtime as we force WASM execution even in the case of matching versions.

1 Answer 1


You need to run with:

--tracing-targets target=level,target2=level2

Tracing targets are handled differently than logging targets.

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