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CpuSampleHotPathAnalyzer.md

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The source code of this class is located at CpuSampleHotPathAnalyzer.hpp.

CpuSampleFrequencyAnalyzer is an analyzer used to find out which call path takes the most cpu usage.

The structure of the result is like:

  • root 100 (1.00)
    • A 50 (0.50)
    • B 35 (0.35)
      • C 25 (0.25)
      • D 5 (0.05)

The missing number means there are some samples have none symbol name.

Functions in CpuSampleFrequencyAnalyzer

getResult

Generate the result. The result type is defined as:

class NodeType {
public:
	std::size_t getCount() const;
	const std::unordered_map<std::shared_ptr<SymbolName>, std::unique_ptr<NodeType>>& getChilds() const&;
};

class ResultType {
public:
	const std::unique_ptr<NodeType>& getRoot() const&;
	std::size_t getTotalSampleCount() const;
};

Example

Example code: Main.cpp

Run example:

sh run.sh a.out 10000

The output is like:

- SymbolName Samples (Overhead)
- root 48038 (1.00)
  - main._omp_fn.0 29988 (0.62)
    - make(int, NodePool&) 23590 (0.49)
      - make(int, NodePool&) 22953 (0.48)
        - make(int, NodePool&) 20486 (0.43)
          - make(int, NodePool&) 16162 (0.34)
            - make(int, NodePool&) 12036 (0.25)
              - make(int, NodePool&) 7793 (0.16)
                - make(int, NodePool&) 4200 (0.09)
                  - apr_palloc 1955 (0.04)
                  - make(int, NodePool&) 1045 (0.02)
                - apr_palloc 2017 (0.04)
              - apr_palloc 2843 (0.06)
            - apr_palloc 2355 (0.05)
          - apr_palloc 3011 (0.06)
        - apr_palloc 2027 (0.04)
      - apr_palloc 517 (0.01)
    - Node::check() const 6210 (0.13)
      - Node::check() const 1072 (0.02)
    - apr_palloc 129 (0.00)
  - vmxarea 16842 (0.35)
    - GOMP_parallel 16095 (0.34)
      - main._omp_fn.0 12685 (0.26)
        - make(int, NodePool&) 5584 (0.12)
          - apr_palloc 2454 (0.05)
          - make(int, NodePool&) 1344 (0.03)
        - apr_palloc 2965 (0.06)
        - Node::check() const 2509 (0.05)
      - apr_palloc 2882 (0.06)
      - Node::check() const 118 (0.00)
      - apr_pool_clear 93 (0.00)
      - make(int, NodePool&) 84 (0.00)
    - __libc_start_main 658 (0.01)
      - main 658 (0.01)
        - make(int, NodePool&) 377 (0.01)
          - make(int, NodePool&) 377 (0.01)
            - make(int, NodePool&) 377 (0.01)
              - make(int, NodePool&) 377 (0.01)
                - make(int, NodePool&) 377 (0.01)
                  - make(int, NodePool&) 377 (0.01)
                    - make(int, NodePool&) 377 (0.01)
                      - make(int, NodePool&) 372 (0.01)
                        - make(int, NodePool&) 363 (0.01)
                          - make(int, NodePool&) 324 (0.01)
                            - make(int, NodePool&) 167 (0.00)
                              - make(int, NodePool&) 41 (0.00)
                              - apr_palloc 37 (0.00)
                            - apr_palloc 130 (0.00)
                          - apr_palloc 29 (0.00)
                        - apr_palloc 7 (0.00)
                      - apr_palloc 4 (0.00)
        - Node::check() const 281 (0.01)
          - Node::check() const 157 (0.00)
    - apr_allocator_destroy 35 (0.00)
    - __munmap 5 (0.00)
    - apr_palloc 1 (0.00)
  - apr_palloc 608 (0.01)
  - apr_pool_clear 346 (0.01)
  - apr_pool_destroy 37 (0.00)
  - apr_allocator_destroy 18 (0.00)
  - Node::check() const 12 (0.00)
  - mmap 8 (0.00)
  - make(int, NodePool&) 2 (0.00)
  - _IO_file_xsputn 1 (0.00)
  - __munmap 1 (0.00)