Format of benchmark log

Is this how benchmark log is supposed to look?

<bound method PerformanceTestResult.json of PerformanceTestResult({"number": 1, "name": "Ackermann2", "num_samples": 200, "min": 551.0, "max": 1382.0, "max_rss": null})>
<bound method PerformanceTestResult.json of PerformanceTestResult({"number": 2, "name": "AngryPhonebook", "num_samples": 200, "min": 189.0, "max": 210.0, "max_rss": null})>
<bound method PerformanceTestResult.json of PerformanceTestResult({"number": 3, "name": "AngryPhonebook.ASCII2", "num_samples": 200, "min": 29.0, "max": 57.0, "max_rss": null})>
<bound method PerformanceTestResult.json of PerformanceTestResult({"number": 4, "name": "AngryPhonebook.ASCII2.Small", "num_samples": 200, "min": 66.0, "max": 94.0, "max_rss": null})>
<bound method PerformanceTestResult.json of PerformanceTestResult({"number": 5, "name": "AngryPhonebook.Armenian", "num_samples": 200, "min": 344.0, "max": 376.0, "max_rss": null})>
<bound method PerformanceTestResult.json of PerformanceTestResult({"number": 6, "name": "AngryPhonebook.Armenian.Small", "num_samples": 200, "min": 108.0, "max": 115.0, "max_rss": null})>
<bound method PerformanceTestResult.json of PerformanceTestResult({"number": 7, "name": "AngryPhonebook.Cyrillic", "num_samples": 200, "min": 368.0, "max": 395.0, "max_rss": null})>
...

Or it's supposed to be a JSON?

This log is generated as result of following command:

utils/build-script --benchmark \
  --swift-darwin-supported-archs "$(uname -m)" \
  --release-debuginfo --swift-disable-dead-stripping \
  --bootstrapping=hosttools

Thanks for helping.

Valeriy

Filed a bug Benchmark_Driver produces benchmark log in format which compare_perf_tests doesn't understand.