results.txt

boost库提供标准的C++ API 配合dev c++使用,功能更加强大

// This benchmark is provided purely for information.
// It might not even compile as-is, 
//   or not give any sensible results. 
//      (e.g., it expects sprintf to be POSIX compliant)

 new results ( with  outsstream vs. stringstream)

bjam -sTOOLS="gcc intel-linux-7.1" -sBUILD="release"

( -sBUILD="profile"  for profiling..)



for comp in "gcc" "intel-linux-7.1"; do 
   echo -n "\n------------------- Compiler  $comp : ---------------- \n"
   for var in "_normal" "_no_reuse_stream" "_stringstr";  do
     echo "-- Variant " $var :
      $EXEDIR/libs/format/benchmark/bench_format${var}/${comp}/release/runtime-link-dynamic/bench_format${var} ;
   done
done



------------------- Compiler  gcc : ----------------
-- Variant  _normal :
printf time         :2.15
ostream time        :4.42,  = 2.05581 * printf
stored format time  :5.85,  = 1.32353 * stream
format time         :11.53,  = 2.6086 * stream
-- Variant  _no_reuse_stream :
printf time         :2.13
ostream time        :4.4,  = 2.06573 * printf
stored format time  :11.1,  = 2.52273 * stream
format time         :14.3,  = 3.25 * stream
-- Variant  _stringstr :
printf time         :2.01
ostream time        :4.42,  = 2.199 * printf
stored format time  :7.92,  = 1.79186 * stream
format time         :12.8,  = 2.89593 * stream

------------------- Compiler  intel-linux-7.1 : ----------------
-- Variant  _normal :
printf time         :2.08
ostream time        :4.49,  = 2.15865 * printf
stored format time  :5.3,  = 1.1804 * stream
format time         :17.8,  = 3.96437 * stream
-- Variant  _no_reuse_stream :
printf time         :2.09
ostream time        :4.37,  = 2.09091 * printf
stored format time  :10.07,  = 2.30435 * stream
format time         :14.46,  = 3.30892 * stream
-- Variant  _stringstr :
printf time         :1.99
ostream time        :5.16,  = 2.59296 * printf
stored format time  :5.83,  = 1.12984 * stream
format time         :17.42,  = 3.37597 * stream




// older Result with gcc-3.03 on linux :

// With flag -g :

/***
printf time         :1.2
ostream time        :2.84,  = 2.36667 * printf 
stored format time  :8.91,  = 3.13732 * stream 
format time         :15.35, = 5.40493 * stream 
format3 time        :21.83, = 7.68662 * stream 
***/


// With flag -O

/***
printf time         :1.16
ostream time        :1.94,  = 1.67241 * printf 
stored format time  :3.68,  = 1.89691 * stream 
format time         :6.31,  = 3.25258 * stream 
format3 time        :9.04,  = 4.65979 * stream 
***/

//  ==> that's quite acceptable.

// ------------------------------------------------------------------------------