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  1. Facter
  2. FACT-2980

Facter 4 outputs the processors.speed fact differently on Linux

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    Details

    • Type: Bug
    • Status: Accepted
    • Priority: Normal
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
    • Template:
    • Method Found:
      Manual Test
    • QA Risk Assessment:
      Needs Assessment

      Description

      Note: This might be an issue only on non-virtualized systems (with processors that support variable frequency)

      facter 3

      $ /usr/bin/facter processors.speed
      4.20 GHz
      

      facter 4 (2 consecutive queries)

      $ bundle exec facter processors.speed
      3.18 GHz
      $ bundle exec facter processors.speed
      1.06 GHz
      

      Facter 4 reads from /proc/cpuinfo which reports the current speed of the processors:

      $ grep 'cpu MHz' /proc/cpuinfo
      cpu MHz		: 1724.163
      cpu MHz		: 1899.271
      cpu MHz		: 2135.291
      cpu MHz		: 1625.782
      cpu MHz		: 1729.682
      cpu MHz		: 1817.039
      cpu MHz		: 1729.482
      cpu MHz		: 1993.369
      

      Facter 3 reads the max speed from the first CPU (in kHz, then converts it):

      $ cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
      4200000
      

      Facter 3 relevant code path: https://github.com/puppetlabs/facter/blob/3.x/lib/src/facts/linux/processor_resolver.cc#L192
      Facter 4 relevant code path: https://github.com/puppetlabs/facter/blob/5f092a30cd5c33c2715619cada943bc1a8e0fa04/lib/facter/resolvers/processors.rb#L75

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              Assignee:
              Unassigned Unassigned
              Reporter:
              luchian.nemes Luchian Nemes
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                Dates

                Created:
                Updated:

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