48d75189cc
+ We should benchmark the core functions in the critical path.
1. LogEvent parsing
2. Log matching
3. Event processing in various metrics
....
+ Using microbenchmark, we can quantify the optimization we do in the future.
---------------------------------------------------------
Benchmark Time CPU Iterations
---------------------------------------------------------
BM_LogEventCreation 4772 ns 4705 ns 145738
Test: make -j64 statsd_benchmark
Bug: 72242322
Change-Id: I43aa704ffdc7cd21e02ef9038eff66ca7022dbfb
75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <vector>
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#include "benchmark/benchmark.h"
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#include "logd/LogEvent.h"
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namespace android {
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namespace os {
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namespace statsd {
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using std::vector;
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/* Special markers for android_log_list_element type */
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static const char EVENT_TYPE_LIST_STOP = '\n'; /* declare end of list */
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static const char EVENT_TYPE_UNKNOWN = '?'; /* protocol error */
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static const char EVENT_TYPE_INT = 0;
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static const char EVENT_TYPE_LONG = 1;
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static const char EVENT_TYPE_STRING = 2;
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static const char EVENT_TYPE_LIST = 3;
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static const char EVENT_TYPE_FLOAT = 4;
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static const int kLogMsgHeaderSize = 28;
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static void write4Bytes(int val, vector<char>* buffer) {
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buffer->push_back(static_cast<char>(val));
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buffer->push_back(static_cast<char>((val >> 8) & 0xFF));
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buffer->push_back(static_cast<char>((val >> 16) & 0xFF));
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buffer->push_back(static_cast<char>((val >> 24) & 0xFF));
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}
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static void getSimpleLogMsgData(log_msg* msg) {
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vector<char> buffer;
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// stats_log tag id
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write4Bytes(1937006964, &buffer);
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buffer.push_back(EVENT_TYPE_LIST);
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buffer.push_back(2); // field counts;
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buffer.push_back(EVENT_TYPE_INT);
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write4Bytes(10 /* atom id */, &buffer);
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buffer.push_back(EVENT_TYPE_INT);
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write4Bytes(99 /* a value to log*/, &buffer);
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buffer.push_back(EVENT_TYPE_LIST_STOP);
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msg->entry_v1.len = buffer.size();
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msg->entry.hdr_size = kLogMsgHeaderSize;
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msg->entry_v1.sec = time(nullptr);
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std::copy(buffer.begin(), buffer.end(), msg->buf + kLogMsgHeaderSize);
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}
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static void BM_LogEventCreation(benchmark::State& state) {
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log_msg msg;
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getSimpleLogMsgData(&msg);
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while (state.KeepRunning()) {
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benchmark::DoNotOptimize(LogEvent(msg));
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}
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}
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BENCHMARK(BM_LogEventCreation);
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} // namespace statsd
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} // namespace os
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} // namespace android
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