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Simplify the json/src/benchmarks.cpp to allow more optimal code gen.

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o For some unknown reason, the complexity of the benchmark platform
  prevented some C++ compilers from generating optimal code, properly
  reflective of the real performance in actual deployment.
o Added the json_benchmarks_simple target, which performs the same
  suite of tests as json_benchmarks.
o Simplified the benchmark platform, and emit an "Average" TPS
  (Transactions Per Second) value reflective of aggregate parse/output
  performance.
This commit is contained in:
Perry Kundert 2017-10-07 15:50:19 -07:00
parent 23440eb86e
commit 0b803d0a5f
4 changed files with 190 additions and 7 deletions
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20
benchmarks/src/benchmarks.cpp
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@ -34,6 +34,19 @@ static void bench(benchpress::context& ctx,
{
// using string streams for benchmarking to factor-out cold-cache disk
// access.
#if defined( FROMFILE )
std::ifstream istr;
{
istr.open( in_path, std::ifstream::in );
// read the stream once
json j;
istr >> j;
// clear flags and rewind
istr.clear();
istr.seekg(0);
}
#else
std::stringstream istr;
{
// read file into string stream
@ -43,11 +56,12 @@ static void bench(benchpress::context& ctx,
// read the stream once
json j;
j << istr;
istr >> j;
// clear flags and rewind
istr.clear();
istr.seekg(0);
}
#endif
switch (mode)
{
@ -62,7 +76,7 @@ static void bench(benchpress::context& ctx,
istr.clear();
istr.seekg(0);
json j;
j << istr;
istr >> j;
}
break;
@ -74,7 +88,7 @@ static void bench(benchpress::context& ctx,
{
// create JSON value from input
json j;
j << istr;
istr >> j;
std::stringstream ostr;
ctx.reset_timer();