system/uapp/trace-benchmark/main.cpp

// Copyright 2017 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "benchmarks.h"

#include "runner.h"

namespace {

// Trace buffer sizes.
// "large" must be sized so it does not overflow during oneshot tests.
// The benchmark will assert-fail if the buffer fills: Otherwise the benchmark
// is invalid.
static constexpr size_t kLargeBufferSizeBytes = 16 * 1024 * 1024;
// "small" is sized so the buffer does fill, repeatedly, during the test.
// The number is chosen to make it easier to eyeball timing differences
// between large and small.
static constexpr size_t kSmallBufferSizeBytes = 16 * 1024;

} // namespace

int main(int argc, char** argv) {
    RunTracingDisabledBenchmarks();
    RunNoTraceBenchmarks();

    static const BenchmarkSpec specs[] = {
        {
            // Note: The buffer is not allowed to fill in oneshot mode.
            "oneshot, 16MB buffer",
            TRACE_BUFFERING_MODE_ONESHOT,
            kLargeBufferSizeBytes,
            kDefaultRunIterations,
        },
        {
            "streaming, 16MB buffer",
            TRACE_BUFFERING_MODE_STREAMING,
            kLargeBufferSizeBytes,
            kDefaultRunIterations,
        },
        {
            "circular, 16MB buffer",
            TRACE_BUFFERING_MODE_CIRCULAR,
            kLargeBufferSizeBytes,
            kDefaultRunIterations,
        },
        {
            "streaming, 16K buffer",
            TRACE_BUFFERING_MODE_STREAMING,
            kSmallBufferSizeBytes,
            kDefaultRunIterations,
        },
        {
            "circular, 16K buffer",
            TRACE_BUFFERING_MODE_CIRCULAR,
            kSmallBufferSizeBytes,
            kDefaultRunIterations,
        },
    };

    for (const auto& spec : specs) {
        RunTracingEnabledBenchmarks(&spec);
    }

    printf("\nTracing benchmarks completed.\n");
    return 0;
}