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Update compile-time benchmark results

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Victor Zverovich 2026-09-04 12:13:45 -07:00
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@ -215,39 +215,42 @@ and [ryu](https://github.com/ulfjack/ryu):
The script [bloat-test.py][test] from [format-benchmark][bench] tests compile
time and code bloat for nontrivial projects. It generates 100 translation units
and uses `printf()` or its alternative five times in each to simulate a
medium-sized project. The resulting executable size and compile time (Apple
clang version 15.0.0 (clang-1500.1.0.2.5), macOS Sonoma, best of three) is shown
in the following tables.
medium-sized project. The resulting executable size and compile time on an
Apple M5 Max running macOS 26.6.2 with Apple Clang 21.0.0
(clang-2100.1.1.101), taking the best of three runs, are shown in the following
tables.
[test]: https://github.com/fmtlib/format-benchmark/blob/master/bloat-test.py
[bench]: https://github.com/fmtlib/format-benchmark
**Optimized build (-O3)**
| Method | Compile Time, s | Executable size, KiB | Stripped size, KiB |
|-----------------|-----------------|----------------------|--------------------|
| printf | 1.6 | 54 | 50 |
| IOStreams | 28.4 | 98 | 84 |
| {fmt} `1122268` | 5.0 | 54 | 50 |
| tinyformat | 32.6 | 164 | 136 |
| Boost Format | 55.0 | 530 | 317 |
| Method | Compile Time, s | Executable size, KiB | Stripped size, KiB |
|-------------------|-----------------|----------------------|--------------------|
| printf | 1.2 | 54 | 50 |
| IOStreams | 21.8 | 98 | 84 |
| {fmt} 12.2 | 4.2 | 54 | 50 |
| tinyformat | 25.5 | 164 | 136 |
| Boost Format 1.88 | 43.4 | 550 | 333 |
| stb_sprintf | 1.4 | 87 | 83 |
{fmt} is fast to compile and is comparable to `printf` in terms of per-call
binary size (within a rounding error on this system).
**Non-optimized build**
| Method | Compile Time, s | Executable size, KiB | Stripped size, KiB |
|-----------------|-----------------|----------------------|--------------------|
| printf | 1.4 | 54 | 50 |
| IOStreams | 27.0 | 88 | 68 |
| {fmt} `1122268` | 4.7 | 87 | 84 |
| tinyformat | 28.1 | 185 | 145 |
| Boost Format | 38.9 | 678 | 381 |
| Method | Compile Time, s | Executable size, KiB | Stripped size, KiB |
|-------------------|-----------------|----------------------|--------------------|
| printf | 1.1 | 54 | 50 |
| IOStreams | 20.7 | 88 | 68 |
| {fmt} 12.2 | 4.0 | 87 | 84 |
| tinyformat | 21.8 | 188 | 145 |
| Boost Format 1.88 | 30.0 | 749 | 430 |
| stb_sprintf | 1.2 | 103 | 99 |
`libc`, `lib(std)c++`, and `libfmt` are all linked as shared libraries
to compare formatting function overhead only. Boost Format is a
header-only library so it doesn\'t provide any linkage options.
`libc`, `libc++`, and `libfmt` were linked as shared libraries to compare
formatting function overhead only. tinyformat, Boost Format, and stb_sprintf
are header-only libraries.
# Projects using {fmt}