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add devdocs how to profile package precompilation with tracy #49784

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merged 3 commits into from
May 15, 2023
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add devdocs how to profile package precompilation with tracy #49784

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9f1f234
add devdocs how to profile package precompilation with tracy
May 12, 2023
53fe86c
tweak implementation
KristofferC May 12, 2023
516f531
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KristofferC May 12, 2023
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2 changes: 2 additions & 0 deletions base/Base.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -596,6 +596,8 @@ function __init__()
ccall(:jl_set_peek_cond, Cvoid, (Ptr{Cvoid},), PROFILE_PRINT_COND[].handle)
errormonitor(Threads.@spawn(profile_printing_listener()))
end
# Prevent spawned Julia process from getting stuck waiting on Tracy to connect.
delete!(ENV, "JULIA_WAIT_FOR_TRACY")
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nothing
end

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1 change: 0 additions & 1 deletion base/loading.jl
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Expand Up @@ -2141,7 +2141,6 @@ function create_expr_cache(pkg::PkgId, input::String, output::String, output_o::
$trace
-`,
"OPENBLAS_NUM_THREADS" => 1,
"JULIA_WAIT_FOR_TRACY" => nothing,
"JULIA_NUM_THREADS" => 1),
stderr = internal_stderr, stdout = internal_stdout),
"w", stdout)
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13 changes: 13 additions & 0 deletions doc/src/devdocs/external_profilers.md
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Expand Up @@ -53,6 +53,19 @@ JULIA_WAIT_FOR_TRACY=1 ./julia -e '...'

The environment variable ensures that Julia waits until it has successfully connected to the Tracy profiler before continuing execution. Afterward, use the Tracy profiler UI, click `Connect`, and Julia execution should resume and profiling should start.

### Profiling package precompilation with Tracy

To profile a package precompilation process it is easiest to explicitly call into `Base.compilecache` with the package you want to precompile:

```julia
pkg = Base.identify_package("SparseArrays")
withenv("JULIA_WAIT_FOR_TRACY" => 1, "TRACY_PORT" => 9001) do
Base.compilecache(pkg)
end
```

Here, we use a custom port for tracy which makes it easier to find the correct client in the Tracy UI to connect to.

### Adding metadata to zones

The various `jl_timing_show_*` and `jl_timing_printf` functions can be used to attach a string (or strings) to a zone. For example, the trace zone for inference shows the method instance that is being inferred.
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