The source code of this class is located at CpuSampleFrequencyAnalyzer.hpp.
CpuSampleFrequencyAnalyzer is an analyzer used to find out which symbol names appear most frequently.
There two different rankings:
- Top Inclusive Symbol Names: The functions that uses the most cpu, include the functions it called
- Top Exclusive Symbol Names: The functions that uses the most cpu, not include the functions it called
Set how many levels should be considered for inclusive sampling, the default value is 3. For example:
- a
- b
- c
- d
- e
(e calls d calls c calls b calls a)
If inclusive trace level is 3, then [a, b, c, d] will be treated as inclusive sample.
Generate the result. The result type is defined as:
using SymbolNameAndCountType = std::pair<std::shared_ptr<SymbolName>, std::size_t>;
class ResultType {
public:
const std::vector<SymbolNameAndCountType>& getTopInclusiveSymbolNames() const&;
const std::vector<SymbolNameAndCountType>& getTopExclusiveSymbolNames() const&;
std::size_t getTotalSampleCount() const;
};Example code: Main.cpp
Run example:
sh run.sh a.out 10000The output is like:
top 16 inclusive symbol names:
No. Overhead Samples SymbolName
1 1.71 50964 make(int, NodePool&)
2 0.50 14860 apr_palloc
3 0.47 13905 main._omp_fn.0
4 0.30 8969 GOMP_parallel
5 0.26 7776 vmxarea
6 0.22 6496 Node::check() const
7 0.01 279 apr_pool_clear
8 0.01 185 main
9 0.01 185 __libc_start_main
10 0.00 47 apr_allocator_destroy
11 0.00 25 apr_pool_destroy
12 0.00 11 __munmap
13 0.00 2 __vsprintf_chk
14 0.00 2 mmap
15 0.00 1 _IO_default_xsputn
16 0.00 1 vfprintf
top 11 exclusive symbol names:
No. Overhead Samples SymbolName
1 0.50 14860 apr_palloc
2 0.23 6793 make(int, NodePool&)
3 0.19 5749 Node::check() const
4 0.04 1122 main._omp_fn.0
5 0.01 279 apr_pool_clear
6 0.00 47 apr_allocator_destroy
7 0.00 25 apr_pool_destroy
8 0.00 11 __munmap
9 0.00 2 mmap
10 0.00 1 _IO_default_xsputn
11 0.00 1 vfprintf