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Replayed Tachyon flamegraphs report unknown efficiency as 100% · Issue #154089 · python/cpython · GitHub

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Replayed Tachyon flamegraphs report unknown efficiency as 100% #154089

Closed
#154092
Closed
Replayed Tachyon flamegraphs report unknown efficiency as 100%#154089
#154092
Labels
stdlibStandard Library Python modules in the Lib/ directorytopic-profilingtype-bugAn unexpected behavior, bug, or error

Description

pablogsal
opened on Jul 19, 2026

Bug report

Bug description:

Binary profiles do not store error or missed-sample statistics, but replayed flamegraphs display them as perfect values.

python -m profiling.sampling run --binary -o profile.bin demo.py
python -m profiling.sampling replay --flamegraph -o profile.html profile.bin

The sidebar shows 100% sampling efficiency and 0% missed samples. These values are unknown during replay and should not be displayed as measured results.

CPython versions tested on:

3.16

Operating systems tested on:

Linux

Linked PRs

Activity

  1. pablogsal
    added
    type-bugAn unexpected behavior, bug, or error
    stdlibStandard Library Python modules in the Lib/ directory
    topic-profiling
    on Jul 19, 2026
  2. pablogsal
    added a commit that references this issue on Jul 19, 2026

    pythongh-154089: Hide unavailable replay efficiency

    0c8a0b7
  3. pablogsal
    closed this as completedin #154092on Aug 25, 2026
  4. pablogsal
    added 2 commits that reference this issue on Aug 25, 2026

    gh-154089: Hide unavailable replay efficiency (#154092)

    cf7e910

    [3.15] gh-154089: Hide unavailable replay efficiency (GH-154092) (#15…

    cb45dee
  5. clin1234
    added a commit that references this issue on Aug 27, 2026

    pythongh-154089: Hide unavailable replay efficiency (python#154092)

    5f1b7e5
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    stdlibStandard Library Python modules in the Lib/ directorytopic-profilingtype-bugAn unexpected behavior, bug, or error

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