Kokkos Node API and Local Linear Algebra Kernels Version of the Day
Tsqr_TimeStats.cpp
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00005 //          Kokkos: Node API and Parallel Node Kernels
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00043 
00044 #include <Tsqr_TimeStats.hpp>
00045 #include <limits>
00046 
00049 
00050 namespace TSQR {
00051 
00052   TimeStats::TimeStats() { init(); }
00053 
00054   void
00055   TimeStats::init () {
00056     min_ = std::numeric_limits< double >::infinity();
00057     max_ = -std::numeric_limits< double >::infinity();
00058     mean_ = double (0);
00059     total_ = double (0);
00060     count_ = int (0);
00061   }
00062 
00063   void
00064   TimeStats::update (const double curTime) {
00065     total_ += curTime;
00066     count_++;
00067 
00068     if (curTime < min_)
00069       min_ = curTime;
00070     if (curTime > max_)
00071       max_ = curTime;
00072 
00073     // Mean(1:n) = ((n-1) / n) * Mean(1:n-1) + x(n) / n.
00074     //
00075     // Casting int to double is exact.
00076     const double scale = double(count_ - 1) / double(count_);
00077     mean_ = scale * mean_ + curTime / double(count_);
00078   }
00079 
00080   void
00081   TimeStats::print (std::ostream& out, 
00082         const bool humanReadable,
00083         const std::string& label,
00084         const std::string& labelLabel,
00085         const bool printHeaders) const
00086   {
00087     using std::endl;
00088 
00089     if (humanReadable)
00090       {
00091   const char prefix[] = "-- ";
00092   out << label << ":" << endl;
00093   if (count() == 0)
00094     out << prefix << "No values collected" << endl;
00095   else if (count() == 1)
00096     out << prefix << "One value collected: " << min() << endl;
00097   else
00098     {
00099       out << prefix << "Count: " << count() << endl
00100     << prefix << "Min:   " << min() << endl
00101     << prefix << "Mean:  " << mean() << endl
00102     << prefix << "Max:   " << max() << endl
00103     << prefix << "Total: " << total() << endl;
00104     }
00105       }
00106     else
00107       {
00108   // "%" identifies this line as a "comment" line to filter out.
00109   // First print field labels on one line, then print field
00110   // values on the next line.
00111   if (printHeaders)
00112     {
00113       out << "%" << labelLabel
00114     << "," << "count"
00115     << "," << "min"
00116     << "," << "mean"
00117     << "," << "max"
00118     << "," << "total" 
00119     << endl;
00120     }
00121   out << label
00122       << "," << count() 
00123       << "," << min() 
00124       << "," << mean()
00125       << "," << max()
00126       << "," << total()
00127       << endl;
00128       }
00129   }
00130 
00131 } // namespace TSQR
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