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b6338b5e - Use tracing-durations-export to visualize parallelism bottlenecks (dev commands) (#816)

Use tracing-durations-export to visualize parallelism bottlenecks (dev commands) (#816) Example usage: ``` # Cached TRACING_DURATIONS_FILE=target/traces/black.ndjson RUST_LOG=puffin=info cargo run --bin puffin-dev --profile profiling -- resolve black TRACING_DURATIONS_FILE=target/traces/meine_stadt_transparent.ndjson RUST_LOG=puffin=info cargo run --bin puffin-dev --profile profiling -- resolve meine_stadt_transparent TRACING_DURATIONS_FILE=target/traces/jupyter.ndjson RUST_LOG=puffin=info cargo run --bin puffin-dev --profile profiling -- resolve jupyter # No cache TRACING_DURATIONS_FILE=target/traces/black-no-cache.ndjson RUST_LOG=puffin=info cargo run --bin puffin-dev --profile profiling -- resolve --no-cache black TRACING_DURATIONS_FILE=target/traces/meine_stadt_transparent-no-cache.ndjson RUST_LOG=puffin=info cargo run --bin puffin-dev --profile profiling -- resolve --no-cache meine_stadt_transparent TRACING_DURATIONS_FILE=target/traces/jupyter-no-cache.ndjson RUST_LOG=puffin=info cargo run --bin puffin-dev --profile profiling -- resolve --no-cache jupyter ``` Uncached black output example: