dial9-rs/dial9

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Always-on profiler for Rust designed for production

Is dial9-rs/dial9 beginner-friendly?

In the last 30 days, dial9-rs/dial9 merged 45 of 56 pull requests from outside contributors, and its maintainers usually reply within 1 day. 12 beginner-friendly issues are open now.

Stars: 523
Forks: 57
Open beginner issues: 12
Indexed issues: 172
Avg merge: 2d 9h
Merged PRs (30d): 49

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Oct 5, 2026
Latest indexed: Oct 6, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

How to contribute to dial9-rs/dial9

Read the contributing guide first: it says how the maintainers want changes proposed, tested and reviewed.
It ships a Dockerfile or Docker Compose file, so you can run it without installing its whole toolchain.
Your contributions will be published under the project's Apache-2.0 license.
Pick one of the 12 open beginner-friendly issues below and comment that you want to work on it before you start.

Beginner friendly Everything

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Issues somebody may already be working on are listed last. List everything by date

decode_all aborts on an 18-byte trace: unchecked frame_count in decode_stack_pool_frame allocates 32 GiB
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 82/100

dial9-rs/dial9#1063 · Opened Oct 21, 2026

Maintainers usually reply within 1 day
Decoder hardening from #681 was reverted by #680: TimestampReset runs overflow the stack, try_for_each_event timestamp add overflows again
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 55/100

dial9-rs/dial9#1062 · Opened Oct 21, 2026

Maintainers usually reply within 1 day
trace_analysis: saturated workers report ~0% active (active spans only emitted on Unpark→Park)
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 58/100

dial9-rs/dial9#1061 · Opened Oct 21, 2026

Maintainers usually reply within 1 day
toolkit: analyze.js Duration and "at" offsets wrong when a trace file has no runtime events (null minTs)
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 82/100

dial9-rs/dial9#1060 · Opened Oct 21, 2026

Maintainers usually reply within 1 day
RUSTSEC-2026-0382: Certificate verification may accept distrusted intermediates
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 15/100

dial9-rs/dial9#1059 · Opened Oct 21, 2026

Maintainers usually reply within 1 day
Attached Tokio runtimes are never released after they are dropped (fd/memory leak on runtime restart)
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 48/100

dial9-rs/dial9#1058 · Opened Oct 20, 2026

Maintainers usually reply within 1 day
idea: Correlate events across `spawn_blocking(...).await`
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 25/100

dial9-rs/dial9#1057 · Opened Oct 16, 2026

Maintainers usually reply within 1 day
fix(viewer): move the show all hosts button to right below the host you just clicked on
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 57/100

dial9-rs/dial9#1056 · Opened Oct 16, 2026

Maintainers usually reply within 1 day
feat(viewer): support jumping to a trace from an aggregated flamegraph
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 25/100

dial9-rs/dial9#1055 · Opened Oct 16, 2026

Maintainers usually reply within 1 day
Support Tokio min version 1.51.x
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 66/100

dial9-rs/dial9#1050 · 1 comment · Opened Oct 16, 2026

Maintainers usually reply within 1 day
feat(memory): Add liveset tracking to the viewer
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 30/100

dial9-rs/dial9#1043 · Opened Oct 15, 2026

Maintainers usually reply within 1 day
Explore sample-based PGO from dial9 CPU samples
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 12/100

dial9-rs/dial9#1039 · 1 comment · Opened Oct 13, 2026

Maintainers usually reply within 1 day
Support trace export across AWS Lambda invocation freeze/thaw
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 36/100

dial9-rs/dial9#1035 · Opened Oct 12, 2026

Maintainers usually reply within 1 day
feat(profiler): upweight samples by on-cpu fraction to produce wall time graph
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 18/100

dial9-rs/dial9#1030 · Opened Oct 10, 2026

Maintainers usually reply within 1 day
bug(profiler): CTimer profiler only profiles Tokio threads
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

dial9-rs/dial9#1025 · Opened Oct 8, 2026

Maintainers usually reply within 1 day
bug(viewer): Top bar can flow onto multiple rows
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 64/100

dial9-rs/dial9#1020 · Opened Oct 6, 2026

Maintainers usually reply within 1 day
DiskBuffer under a tmpfs-backed directory silently consumes RAM
Open
- Is something wrong?
Difficulty 3/5 Half a day Newbie friendliness 62/100

dial9-rs/dial9#1019 · Opened Oct 6, 2026

Maintainers usually reply within 1 day
feat(viewer): Serve cache headers so object files are not reloaded
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

dial9-rs/dial9#1018 · Opened Oct 5, 2026

Maintainers usually reply within 1 day
Caught panics still print to stderr on every occurrence
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 45/100

dial9-rs/dial9#1008 · Opened Oct 2, 2026

Maintainers usually reply within 1 day
fix(dial9-core): a panic in a with_source closure or on_thread_start kills the flush thread
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 42/100

dial9-rs/dial9#1007 · Opened Oct 2, 2026

Maintainers usually reply within 1 day
improve off cpu flamegraphs
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

dial9-rs/dial9#1003 · Opened Oct 2, 2026

Maintainers usually reply within 1 day
"exemplar refresh incomplete" that happens selecting a period from the span histogram
Open
- Is something wrong?
bug

Difficulty 3/5 1-2 days Newbie friendliness 52/100

dial9-rs/dial9#993 · Opened Oct 1, 2026

Maintainers usually reply within 1 day
fix(viewer): Don't extend view range for TaskDumps
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 62/100

dial9-rs/dial9#988 · Opened Sep 29, 2026

Maintainers usually reply within 1 day
fix(disk buffer): If deletion fails, the file is still removed from accounting
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 68/100

dial9-rs/dial9#987 · Opened Sep 29, 2026

Maintainers usually reply within 1 day
feat(viewer): When files are small, aggregate more data
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

dial9-rs/dial9#985 · Opened Sep 28, 2026

Maintainers usually reply within 1 day
feat(memory profiling): Use footer to track whether an allocation was sampled
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 25/100

dial9-rs/dial9#984 · Opened Sep 28, 2026

Maintainers usually reply within 1 day
bug(viewer): tokio stats go-to-long poll doesn't scroll to the problem
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 38/100

dial9-rs/dial9#982 · Opened Sep 25, 2026

Maintainers usually reply within 1 day
fix(viewer): The descheduled worker periods overlay makes the UI very slow
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

dial9-rs/dial9#977 · Opened Sep 25, 2026

Maintainers usually reply within 1 day
fix(spans): `dial9_span!` macro expands a TraceEvent derive that resolves to consuming crate
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 55/100

dial9-rs/dial9#959 · Opened Sep 24, 2026

Maintainers usually reply within 1 day
feat(viewer): Add a "hotspots" view to the profiler
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

dial9-rs/dial9#957 · Opened Sep 23, 2026

Maintainers usually reply within 1 day
fix(viewer): SVG flamegraph export doesn't respect "inspect"
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 68/100

dial9-rs/dial9#956 · Opened Sep 23, 2026

Maintainers usually reply within 1 day
fix(viewer): Flamegraph diff produces URLs that are too long when focusing on specific function
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 62/100

dial9-rs/dial9#954 · Opened Sep 23, 2026

Maintainers usually reply within 1 day
fix(viewer): Autohide services with 0 hosts / no data in time range
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 55/100

dial9-rs/dial9#953 · Opened Sep 23, 2026

Maintainers usually reply within 1 day
fix(viewer): Hide process resource events by default from the events pane
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 54/100

dial9-rs/dial9#951 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
fix(viewer): find better messaging for the "scheduling" field
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 65/100

dial9-rs/dial9#950 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
fix(viewer): never hide the time composition for a row in the span explorer
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 35/100

dial9-rs/dial9#949 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
feat(viewer): Flamegraph view should show which tasks are using the most CPU
Open
- Is something wrong?
Difficulty 3/5 1-2 days Newbie friendliness 58/100

dial9-rs/dial9#948 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
fix(viewer): PollEnd -> NextPoll is not a sensical thing to filter for
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 58/100

dial9-rs/dial9#946 · Opened Sep 22, 2026

Maintainers usually reply within 1 day
Bound/Cleanup disk usage for downloaded traces and analysis caches
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 42/100

dial9-rs/dial9#944 · Opened Sep 21, 2026

Maintainers usually reply within 1 day
fix(viewer): Add the ability to manually run service discovery
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 62/100

dial9-rs/dial9#943 · Opened Sep 21, 2026

Maintainers usually reply within 1 day
bug(viewer): all-from-tasks makes task semi-permanently purple
Open
- Is something wrong?
Difficulty 2/5 1-3 hours Newbie friendliness 57/100

dial9-rs/dial9#938 · Opened Sep 20, 2026

Maintainers usually reply within 1 day
Support huge numbers of hosts in viewer UI
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 48/100

dial9-rs/dial9#935 · Opened Sep 18, 2026

Maintainers usually reply within 1 day
feat(tokio stats): Show spark-histograms for sections
May be free again @jv1i claimed this 28 days ago, and no pull request is open. Open
- Is something wrong?
dial9-rs/dial9#930 · 1 assignee · Opened Sep 17, 2026

Maintainers usually reply within 1 day
optimize `intern_location` in dial9-tokio-telemetry
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 48/100

dial9-rs/dial9#918 · Opened Sep 16, 2026

Maintainers usually reply within 1 day
Symposium & Dial9: The setup skill never reaches Symposium users
Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 58/100

dial9-rs/dial9#916 · Opened Sep 16, 2026

Maintainers usually reply within 1 day
Symposium & Dial9: Analysis tools that crash or report unsupported findings
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

dial9-rs/dial9#914 · Opened Sep 16, 2026

Maintainers usually reply within 1 day
add tracking of the liveset support
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 25/100

dial9-rs/dial9#912 · Opened Sep 16, 2026

Maintainers usually reply within 1 day
feat(viewer): Support pop-out of flamegraph when the viewer is loaded from a time range based URL
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 25/100

dial9-rs/dial9#909 · Opened Sep 15, 2026

Maintainers usually reply within 1 day
Support cross CPU/GPU flamegraphs
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 25/100

dial9-rs/dial9#906 · Opened Sep 15, 2026

Maintainers usually reply within 1 day
malloc stat events
Open
- Is something wrong?
Difficulty 5/5 Over a week Newbie friendliness 35/100

dial9-rs/dial9#887 · 1 comment · Opened Sep 5, 2026

Maintainers usually reply within 1 day

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