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address review comments

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This commit is contained in:
Eric Fiselier 2015-03-17 18:42:41 -04:00
parent f65da9d581
commit ffb67dcabf
2 changed files with 67 additions and 2 deletions
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65
README.md
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@ -150,6 +150,71 @@ static void BM_MultiThreaded(benchmark::State& state) {
BENCHMARK(BM_MultiThreaded)->Threads(2);
```
Output Formats
--------------
The library supports multiple output formats. Use the
`--benchmark_format=<tabular|json>` flag to set the format type. `tabular` is
the default format.
The Tabular format is intended to be a human readable
format. By default the format generates color output. Example tabular output
looks like:
```
Run on (40 X 2801 MHz CPUs)
2015/03/17-18:35:54
Build Type: DEBUG
Benchmark Time(ns) CPU(ns) Iterations
----------------------------------------------------------------------
BM_SetInsert/1024/1 28928 29349 23853 133.097kB/s 33.2742k items/s
BM_SetInsert/1024/8 32065 32913 21375 949.487kB/s 237.372k items/s
BM_SetInsert/1024/10 33157 33648 21431 1.13369MB/s 290.225k items/s
```
The JSON format outputs human readable json split into two top level attributes.
The `context` attribute contains information about the run in general, including
information about the CPU and the date.
The `benchmarks` attribute contains a list of ever benchmark run. Example json
output looks like:
```
{
"context": {
"date": "2015/03/17-18:40:25",
"num_cpus": 40,
"mhz_per_cpu": 2801,
"cpu_scaling_enabled": false,
"build_type": "debug"
},
"benchmarks": [
{
"name": "BM_SetInsert/1024/1",
"iterations": 94877,
"real_time": 29275,
"cpu_time": 29836,
"bytes_per_second": 134066,
"items_per_second": 33516
},
{
"name": "BM_SetInsert/1024/8",
"iterations": 21609,
"real_time": 32317,
"cpu_time": 32429,
"bytes_per_second": 986770,
"items_per_second": 246693
},
{
"name": "BM_SetInsert/1024/10",
"iterations": 21393,
"real_time": 32724,
"cpu_time": 33355,
"bytes_per_second": 1199226,
"items_per_second": 299807
}
]
}
```
Linking against the library
---------------------------
When using gcc, it is necessary to link against pthread to avoid runtime exceptions. This is due to how gcc implements std::thread. See [issue #67](https://github.com/google/benchmark/issues/67) for more details.

4
src/reporter.cc
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@ -248,9 +248,9 @@ bool JSONReporter::ReportContext(const Context& context) {
<< ",\n";
#if defined(NDEBUG)
const char* build_type = "release";
const char[] build_type = "release";
#else
const char* build_type = "debug";
const char[] build_type = "debug";
#endif
out << indent << FormatKV("build_type", build_type) << "\n";
// Close context block and open the list of benchmarks.