gperftool分析leveldb内存申请

总结下gperftool的使用，写了个leveldb大量写数据的demo用来测试。

gperftool安装使用

install libunwind

git clone git@github.com:libunwind/libunwind.git

cd libunwind/

autoreconf -i

./configure

make

make install

install gperftools

git clone https://github.com/gperftools/gperftools

cd gperftools/

./autogen.sh

./configure

make

make install prefix=/usr

图形化工具

yum install graphviz

yum install ghostscript

测试leveldb的demo

#include <cassert>
#include <iostream>
#include <string>
#include <leveldb/db.h>
#include <gperftools/profiler.h>
using namespace std;
// g++ -o run run.cpp -pthread -lleveldb -std=c++11
#define ASSERT_STATUS(status, db)       \
    do{                                 \
        if (!status.ok())               \
        {                               \
            delete db;                  \
            return -1;                  \
        }                               \
    } while (0)                         \


int main() {
    // ProfilerStart("/root/code/leveldb/heap.prof");
    leveldb::DB* db;
    leveldb::Options options;
    options.create_if_missing = true;
    leveldb::Status status = leveldb::DB::Open(options, "/tmp/testdb", &db);
    assert(status.ok());

    for (auto k{0}; k < 10000000; ++k)
    {
        std::string key = to_string(k+600000);
        std::string value = "river_fdsssssdddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd" + to_string(k);
        status = db->Put(leveldb::WriteOptions(), key, value);
        ASSERT_STATUS(status, db);
    }
    

    // cout << "get key = " << key << ", value = " << str << endl;
    // cin.get();
    delete db;
    // ProfilerStop();
    cout << "ok!!!" << endl;
    return 0;
}

测试结果

g++ run.cpp -std=c++11 -lleveldb -pthread -ltcmalloc -lprofiler -g -o run

HEAPPROFILE="/root/code/leveldb/run" ./run

pprof --pdf run run.0001.heap >run.pdf