Re: [Boost-bugs] [Boost C++ Libraries] #12248: boost::log::attributes:timer accuracy shift

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #12248: boost::log::attributes:timer accuracy shift
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-07-17 15:07:41

#12248: boost::log::attributes:timer accuracy shift
  Reporter: tib | Owner: andysem
      Type: Bugs | Status: closed
 Milestone: To Be Determined | Component: log
   Version: Boost 1.61.0 | Severity: Problem
Resolution: invalid | Keywords: log timer
Changes (by andysem):

 * status: new => closed
 * resolution: => invalid


 I believe your `PreciseTimer` is less precise than the timer the library
 offers. In particular, your code involves FP operations on the number of
 ticks since the timer construction:

 double e = (nowCounter.QuadPart - m_startCounter.QuadPart) / (double)

 As the difference grows, the precision of `double` becomes insufficient.

 The library code is also faster since it avoids division in the hot path.
 I admit, the implementation could be made more precise if 128-bit integer
 math was used instead of FP math, but I suspect it would be much slower

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