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Victor Zverovich 2017-09-10 07:35:32 -07:00
parent 534bff7d31
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@ -298,11 +298,12 @@ further details see the `source
================= ============= =========== ================= ============= ===========
Library Method Run Time, s Library Method Run Time, s
================= ============= =========== ================= ============= ===========
EGLIBC 2.19 printf 1.30 libc printf 1.35
libstdc++ 4.8.2 std::ostream 1.85 libc++ std::ostream 3.42
fmt 1.0 fmt::print 1.42 fmt 534bff7 fmt::print 1.56
tinyformat 2.0.1 tfm::printf 2.25 tinyformat 2.0.1 tfm::printf 3.73
Boost Format 1.54 boost::format 9.94 Boost Format 1.54 boost::format 8.44
Folly Format folly::format 2.54
================= ============= =========== ================= ============= ===========
As you can see ``boost::format`` is much slower than the alternative methods; this As you can see ``boost::format`` is much slower than the alternative methods; this
@ -322,19 +323,20 @@ from `format-benchmark <https://github.com/fmtlib/format-benchmark>`_
tests compile time and code bloat for nontrivial projects. tests compile time and code bloat for nontrivial projects.
It generates 100 translation units and uses ``printf()`` or its alternative It generates 100 translation units and uses ``printf()`` or its alternative
five times in each to simulate a medium sized project. The resulting five times in each to simulate a medium sized project. The resulting
executable size and compile time (g++-4.8.1, Ubuntu GNU/Linux 13.10, executable size and compile time (Apple LLVM version 8.1.0 (clang-802.0.42),
best of three) is shown in the following tables. macOS Sierra, best of three) is shown in the following tables.
**Optimized build (-O3)** **Optimized build (-O3)**
============ =============== ==================== ================== ============ =============== ==================== ==================
Method Compile Time, s Executable size, KiB Stripped size, KiB Method Compile Time, s Executable size, KiB Stripped size, KiB
============ =============== ==================== ================== ============ =============== ==================== ==================
printf 2.6 41 30 printf 2.3 29 26
IOStreams 19.4 92 70 IOStreams 26.9 59 55
fmt 46.8 46 34 fmt 38.0 37 34
tinyformat 64.6 418 386 tinyformat 42.5 104 98
Boost Format 222.8 990 923 Boost Format 112.2 774 751
Folly Format 152.3 104 87
============ =============== ==================== ================== ============ =============== ==================== ==================
As you can see, fmt has two times less overhead in terms of resulting As you can see, fmt has two times less overhead in terms of resulting
@ -346,14 +348,15 @@ Boost Format has by far the largest overheads.
============ =============== ==================== ================== ============ =============== ==================== ==================
Method Compile Time, s Executable size, KiB Stripped size, KiB Method Compile Time, s Executable size, KiB Stripped size, KiB
============ =============== ==================== ================== ============ =============== ==================== ==================
printf 2.1 41 30 printf 2.0 33 30
IOStreams 19.7 86 62 IOStreams 25.4 56 52
fmt 47.9 108 86 fmt 37.0 57 51
tinyformat 27.7 234 190 tinyformat 30.2 88 82
Boost Format 122.6 884 763 Boost Format 54.0 364 302
Folly Format 107.1 438 424
============ =============== ==================== ================== ============ =============== ==================== ==================
``libc``, ``libstdc++`` and ``libfmt`` are all linked as shared ``libc``, ``lib(std)c++`` and ``libfmt`` are all linked as shared
libraries to compare formatting function overhead only. Boost Format libraries to compare formatting function overhead only. Boost Format
and tinyformat are header-only libraries so they don't provide any and tinyformat are header-only libraries so they don't provide any
linkage options. linkage options.