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  1. Qt
  2. QTBUG-67056

QV4_PROFILE_WRITE_PERF_MAP no longer working

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      d5c7229339a916b2f1f004ec4ea9de89995c003d

      Description

      The QML/JS engine had the feature to write a perf map file for all its JIT-compiled JS functions. This could be turned on with QV4_PROFILE_WRITE_PERF_MAP=1.

      This feature seems to no longer exist.

      A workaround to still record usable perf traces is to disable the JIT compiler with QV4_FORCE_INTERPRETER=1. However that changes the result as it slows down code execution - and for profiling, one should always measure as close to a normal execution as possible.

      Note that this is documented to work on https://doc.qt.io/qtcreator/creator-cpu-usage-analyzer.html.

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            Assignee:
            ulherman Ulf Hermann
            Reporter:
            tmcguire Thomas McGuire
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              Resolved:

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