From: Wolfgang Bangerth Date: Sat, 3 Dec 2016 13:57:03 +0000 (-0700) Subject: Only show TimerOutput percentages down to 0.1%. X-Git-Tag: v8.5.0-rc1~346^2 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F3655%2Fhead;p=dealii.git Only show TimerOutput percentages down to 0.1%. Currently, if a TimerOutput section takes a very small fraction of the overall time, we happily output in the last column that it took 6.5e-4%. This is not only visually awkward compared to all of the other numbers that are not using the e-04 notation, but also pretty pointless: nobody cares whether something took that small a fraction of the overall time, and if they happen to do anyway: the absolute amount of time is printed in the previous column. Consequently, show everything that takes less than 0.1% of time as 0%. --- diff --git a/doc/news/changes.h b/doc/news/changes.h index 0026c9cbfb..4aeeeed31f 100644 --- a/doc/news/changes.h +++ b/doc/news/changes.h @@ -459,6 +459,13 @@ inconvenience this causes.

Specific improvements

    +
  1. Changed: To improve readability, TimerOutput::print_summary() + now simply outputs "0%" if a particular section's time requires + less than 0.1 per cent of the overall run time. +
    + (Wolfgang Bangerth, 2016/12/03) +
  2. +
  3. Improved: The trait class has_vmult_add in linear_operators.h has been restricted to test if there is a vmult_add and a Tvmult_add method that takes two arguments. This check now also works with diff --git a/source/base/timer.cc b/source/base/timer.cc index 2b29039f0d..767b085a4f 100644 --- a/source/base/timer.cc +++ b/source/base/timer.cc @@ -533,9 +533,22 @@ TimerOutput::print_summary () const out_stream << std::setprecision(3); out_stream << i->second.total_cpu_time << "s |"; out_stream << std::setw(10); - out_stream << std::setprecision(2); if (total_cpu_time != 0) - out_stream << i->second.total_cpu_time/total_cpu_time * 100 << "% |"; + { + // if run time was less than 0.1%, just print a zero to avoid + // printing silly things such as "2.45e-6%". otherwise print + // the actual percentage + const double fraction = i->second.total_cpu_time/total_cpu_time; + if (fraction > 0.001) + { + out_stream << std::setprecision(2); + out_stream << fraction * 100; + } + else + out_stream << 0.0; + + out_stream << "% |"; + } else out_stream << 0.0 << "% |"; } @@ -591,11 +604,25 @@ TimerOutput::print_summary () const out_stream << std::setprecision(3); out_stream << i->second.total_wall_time << "s |"; out_stream << std::setw(10); - out_stream << std::setprecision(2); - double value = i->second.total_wall_time/total_wall_time * 100; - if (!numbers::is_finite(value)) - value = 0.0; - out_stream << value << "% |"; + + if (total_wall_time != 0) + { + // if run time was less than 0.1%, just print a zero to avoid + // printing silly things such as "2.45e-6%". otherwise print + // the actual percentage + const double fraction = i->second.total_wall_time/total_wall_time; + if (fraction > 0.001) + { + out_stream << std::setprecision(2); + out_stream << fraction * 100; + } + else + out_stream << 0.0; + + out_stream << "% |"; + } + else + out_stream << 0.0 << "% |"; } out_stream << std::endl << "+---------------------------------+-----------+"