chrome_tracing

Simple C/C++ API to generate .trace files for chrome://tracing

some performance characteristics (actual on 2017-10-19)

Run on (8 X 3600 MHz CPU s)
2017-10-19 22:59:51
***WARNING*** CPU scaling is enabled, the benchmark real time measurements may be noisy and will incur extra overhead.
***WARNING*** Library was built as DEBUG. Timings may be affected.
--------------------------------------------------------------
Benchmark                       Time           CPU Iterations
--------------------------------------------------------------
BM_basic_output              3945 ns       3943 ns     177726
BM_int_argument_output       4333 ns       4332 ns     161639
BM_convert_time               325 ns        325 ns    2136579

performance characteristics update (2017-11-01, threaded event flushing to a file):

Run on (8 X 3600 MHz CPU s)
2017-11-01 12:48:43
***WARNING*** Library was built as DEBUG. Timings may be affected.
--------------------------------------------------------------
Benchmark                       Time           CPU Iterations
--------------------------------------------------------------
BM_basic_output               352 ns        351 ns    2022722
BM_int_argument_output        399 ns        399 ns    1787501
BM_convert_time                24 ns         24 ns   29119807
BM_convert_args               460 ns        460 ns    1523755

Note: this is an "amortized" performance. Actual flush thread performance varies depending on the IO speed.

Trace format description:

https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview