linux环境下 C++性能测试工具 gprof + kprof + gprof2dot【转】

原文：http://www.cnblogs.com/rocketfan/archive/2009/11/15/1603465.html

1.gprof

很有名了，google下很多教程

g++ -pg -g -o test test.cc

./test //会生成gmon.out

gprof ./test > prof.log

看一下对于我前面提到的huffman编码压缩+解码解压缩全部过程的一个程序

对于生成的prof.log ,wow, 很有用处的但是看起来有点累，不是吗：）

Code
Flat profile:
Each sample counts as 0.01 seconds.
%   cumulative   self              self     total
time   seconds   seconds    calls   s/call   s/call name
32.51 1.71 1.71 13127166 0.00 0.00 glzip::HuffTree<unsigned char, glzip::decode_hufftree>::decode_byte(unsigned char, glzip::Buffer&, glzip::HuffNode<unsigned char>*&, int)
18.73 2.69 0.98 105017328 0.00 0.00 glzip::Buffer::write_bit(int)
16.63 3.57 0.88 24292128 0.00 0.00 glzip::Buffer::write_string(std::string const&)
7.22 3.95 0.38 61711820 0.00 0.00 glzip::Buffer::read_byte(unsigned char&)
5.80 4.25 0.30 37419691 0.00 0.00 glzip::Buffer::write_byte(unsigned char)
5.51 4.54 0.29 1 0.29 2.48 glzip::Encoder<unsigned char>::do_encode_file(glzip::char_tag)
5.13 4.82 0.27 105017721 0.00 0.00 glzip::HuffNode<unsigned char>::is_leaf()
3.04 4.97 0.16 1 0.16 0.31 glzip::Encoder<unsigned char>::do_caculate_frequency(glzip::char_tag)
2.47 5.11 0.13 1 0.13 2.42 glzip::HuffTree<unsigned char, glzip::decode_hufftree>::decode_file()
1.14 5.17 0.06 24292227 0.00 0.00 std::vector<std::string, std::allocator<std::string> >::operator[](unsigned int)
0.95 5.21 0.05 1 0.05 0.05 glzip::HuffTree<unsigned char, glzip::encode_hufftree>::do_serialize_tree(glzip::HuffNode<unsigned char>*, glzip::Buffer&)
0.29 5.23 0.01 24292133 0.00 0.00 glzip::HuffTreeBase<unsigned char>::root() const
0.29 5.25 0.01 574 0.00 0.00 glzip::Buffer::flush_buf()
0.19 5.25 0.01 6 0.00 0.00 glzip::Buffer::~Buffer()
0.10 5.26 0.01                             unsigned int const& std::min<unsigned int>(unsigned int const&, unsigned int const&)
0.00 5.26 0.00 12901 0.00 0.00 std::_Deque_iterator<glzip::HuffNode<unsigned char>*, glzip::HuffNode<unsigned char>*&, glzip::HuffNode<unsigned char>**>::_Deque_iterator(std::_Deque_iterator<glzip::HuffNode<unsigned char>*, glzip::HuffNode<unsigned char>*&, glzip::HuffNode<unsigned char>**> const&)
0.00 5.26 0.00 6065 0.00 0.00 std::__deque_buf_size(unsigned int)
0.00 5.26 0.00 6056 0.00 0.00 std::_Deque_iterator<glzip::HuffNode<unsigned char>*, glzip::HuffNode<unsigned char>*&, glzip::HuffNode<unsigned char>**>::_S_buffer_size()
0.00 5.26 0.00 5656 0.00 0.00 std::_Deque_iterator<glzip::HuffNode<unsigned char>*, glzip::HuffNode<unsigned char>*&, glzip::HuffNode<unsigned char>**>::operator*() const
0.00 5.26 0.00 5656 0.00 0.00 std::_Deque_iterator<glzip::HuffNode<unsigned char>*, glzip::HuffNode<unsigned char>*&, glzip::HuffNode<unsigned char>**>::operator+=(int)
0.00 5.26 0.00 4871 0.00 0.00 std::_Deque_iterator<glzip::HuffNode<unsigned char>*, glzip::HuffNode<unsigned char>*&, glzip::HuffNode<unsigned char>**>::operator+(int) const
0.00 5.26 0.00 3126 0.00 0.00 glzip::HuffNode<unsigned char>::weight() const
0.00 5.26 0.00 1465 0.00 0.00 glzip::HuffTree<unsigned char, glzip::encode_hufftree>::HuffNodePtrGreater::operator()(glzip::HuffNode<unsigned char> const*, glzip::HuffNode<unsigned char> const*)
0.00 5.26 0.00 946 0.00 0.00 glzip::Buffer::fill_buf()
0.00 5.26 0.00 785 0.00 0.00 std::_Deque_iterator<glzip::HuffNode<unsigned char>*, glzip::HuffNode<unsigned char>*&, glzip::HuffNode<unsigned char>**>::operator-(int) const
0.00 5.26 0.00 785 0.00 0.00 std::_Deque_iterator<glzip::HuffNode<unsigned char>*, glzip::HuffNode<unsigned char>*&, glzip::HuffNode<unsigned char>**>::operator-=(int)
0.00 5.26 0.00 590 0.00 0.00 glzip::HuffNode<unsigned char>::left() const
0.00 5.26 0.00 590 0.00 0.00 glzip::HuffNode<unsigned char>::right() const
0.00 5.26 0.00 453 0.00 0.00 operator new(unsigned int, void*)
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