Trace Event Format ⭐

Project Site

Schema

File Format: JSON

Timestamping: Timestamped

Profilers 🔎

14 Profilers directly output this format:

• ansible-trace
• Bazel Build System [Docs]
• clang -ftime-trace
• Cpuusage [Docs]
• dotnet-trace [Docs]
• fgtrace [Docs]
• Hermes [Docs]
• PerfMark [Docs]
• PyTorch Profiler [Docs]
• rocprof [Docs]
• TensorFlow Profiler [Docs]
• TensorFlow Timeline [Docs]
• toplev [Docs]
• VizTracer [Docs]

Analysis UIs 📊

6 Analysis UIs can read this format:

• chrome://tracing/
• Firefox Profiler
• Perfetto
• Speedscope
• Vampir [Docs]
• VizTracer vizviewer [Docs]

Profiler & Analysis UI Graph

[View fullscreen]

Converters

Converts From

This format is directly convertable from 12 formats:

• Android Event Log, via event_log_importer.html [Docs]
• android_ndk_perf perf.data, via perf_to_tracing_json.py [Docs]
• Common Trace Format, via babeltrace_to_json.py [Docs]
• Event Tracing for Windows, via etw_importer.html [Docs]
• Go Trace, via go tool trace [Docs]
• Google Cloud Trace, via gcloud_trace_importer.html [Docs]
• ninja_log, via ninjatracing [Docs]
• nvprof, via nvprof2json [Docs]
• Perfetto Trace, via traceconv json [Docs]
• Qualcomm Snapdragon Profiler, via snapdragon2trace [Docs]
• TAU tracefile, via tau_trace2json -chrome [Docs]
• uftrace, via uftrace dump --chrome [Docs]

Transitive Formats

Transitive formats you can convert from:

• Data Formats Only
• Profilers + Data Formats (large graph)

Converts To

This format is directly convertable to 2 formats:

• Folded Stacks, via stackcollapse-chrome-tracing.py [Docs]
• Open Trace Format 2 .otf2, via otf2_cli_chrome_trace_converter [Docs]

Transitive Formats

Transitive formats you can convert to:

• Data Formats Only
• Data Formats + Analysis UIs (large graph)