Benchmarks
This section compares the performance of libcdada to native libstdc++
code, to measure the overhead it adds. The benchmarking code is here:
Please note:
- The benchmarking is not exhaustive, but just wants to highlight tha the
the library is roughly equivalent to the underlying
libstdc++, and that for aligned types or customlibcdadacontainers this overhead is negligible - If you have hard performance requirements to meet, consider writing your own data structures.
Conditions
- Tested in Linux
- Standard Debian10
libstdc++package libcdadaconfigured with../configure(-O3)- All lcores have been tuned to, to avoid CPU scaling during the test
~/ sudo cpufreq-set -c 0 -g performance
#...
~/ sudo cpufreq-set -c 7 -g performance
- Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz/4.6GHz
- 16GB DDR4 2667 MHz
Results
The results of a random execution of ./benchmark:
====================================================================
Type: uint32_t
====================================================================
SET insert(ticks) erase(ticks)
--------------------------------------------------------------------
C++ set<uint32_t> 752 698
C cdada_set(uint32_t) 746 743
C cdada_set_custom(uint32_t) 758 744
MAP insert(ticks) erase(ticks)
--------------------------------------------------------------------
C++ map<uint32_t, void*> 830 722
C cdada_map(uint32_t) 809 1009
C cdada_map_custom(uint32_t) 818 1017
LIST insert(ticks) erase(ticks)
--------------------------------------------------------------------
C++ list<uint32_t> 20 17
C cdada_list(uint32_t) 28 20
C cdada_list_custom(uint32_t) 27 20
====================================================================
Type: test_u552_t (69 bytes)
(Note: cdada non-custom containers will pad to 128bytes)
====================================================================
SET insert(ticks) erase(ticks)
--------------------------------------------------------------------
C++ set<test_u552_t> 1410 1082
C cdada_set(test_u552_t) 1623 1311
C cdada_set_custom(test_u552_t) 1433 1098
MAP insert(ticks) erase(ticks)
--------------------------------------------------------------------
C++ map<test_u552_t, void*> 1593 1148
C cdada_map(test_u552_t) 1646 1768
C cdada_map_custom(test_u552_t) 1605 1631
LIST insert(ticks) erase(ticks)
--------------------------------------------------------------------
C++ list<test_u552_t> 42 22
C cdada_list(test_u552_t) 67 40
C cdada_list_custom(test_u552_t) 44 25
====================================================================
Type: test_u3552_t (444 bytes)
(Note: cdada non-custom containers don't support >256 bytes)
====================================================================
SET insert(ticks) erase(ticks)
--------------------------------------------------------------------
C++ set<test_u3552_t> 1991 1465
C cdada_set_custom(test_u3552_t) 2005 1479
MAP insert(ticks) erase(ticks)
-------------------------------------------------------------------
C++ map<test_u3552_t, void*> 1993 1472
C cdada_map_custom(test_u3552_t) 1988 2021
LIST insert(ticks) erase(ticks)
--------------------------------------------------------------------
C++ list<test_u3552_t> 178 76
C cdada_list_custom(test_u3552_t) 175 79