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Marcus Holland-Moritz 2021-03-13 12:32:12 +01:00
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@ -162,56 +162,12 @@ A good starting point for apt-based systems is probably:
libfuse3-dev \
libgoogle-glog-dev
You can pick either `clang` or `g++`, but at least recent `clang`
versions will produce substantially faster code:
Note that when building with `gcc`, the optimization level will be
set to `-O2` instead of the CMake default of `-O3` for release
builds. At least with versions up to `gcc-10`, the `-O3` build is
[up to 70% slower](https://github.com/mhx/dwarfs/issues/14) than a
build with `-O2`.
$ hyperfine -L prog $(echo build-*/mkdwarfs | tr ' ' ,) '{prog} --no-progress --log-level warn -i /usr/include -o /dev/null -C null'
Benchmark #1: build-clang-10/mkdwarfs --no-progress --log-level warn -i /usr/include -o /dev/null -C null
Time (mean ± σ): 6.403 s ± 0.178 s [User: 12.039 s, System: 1.963 s]
Range (min … max): 6.250 s … 6.701 s 10 runs
Benchmark #2: build-clang-11/mkdwarfs --no-progress --log-level warn -i /usr/include -o /dev/null -C null
Time (mean ± σ): 6.408 s ± 0.143 s [User: 12.109 s, System: 1.974 s]
Range (min … max): 6.231 s … 6.617 s 10 runs
Benchmark #3: build-gcc-10/mkdwarfs --no-progress --log-level warn -i /usr/include -o /dev/null -C null
Time (mean ± σ): 11.484 s ± 0.245 s [User: 18.487 s, System: 2.071 s]
Range (min … max): 11.119 s … 11.779 s 10 runs
Benchmark #4: build-gcc-9/mkdwarfs --no-progress --log-level warn -i /usr/include -o /dev/null -C null
Time (mean ± σ): 11.443 s ± 0.242 s [User: 18.419 s, System: 2.067 s]
Range (min … max): 11.177 s … 11.742 s 10 runs
Summary
'build-clang-10/mkdwarfs --no-progress --log-level warn -i /usr/include -o /dev/null -C null' ran
1.00 ± 0.04 times faster than 'build-clang-11/mkdwarfs --no-progress --log-level warn -i /usr/include -o /dev/null -C null'
1.79 ± 0.06 times faster than 'build-gcc-9/mkdwarfs --no-progress --log-level warn -i /usr/include -o /dev/null -C null'
1.79 ± 0.06 times faster than 'build-gcc-10/mkdwarfs --no-progress --log-level warn -i /usr/include -o /dev/null -C null'
$ hyperfine build-*/dwarfs_test
Benchmark #1: build-clang-10/dwarfs_test
Time (mean ± σ): 1.789 s ± 0.008 s [User: 2.049 s, System: 0.636 s]
Range (min … max): 1.775 s … 1.808 s 10 runs
Benchmark #2: build-clang-11/dwarfs_test
Time (mean ± σ): 1.806 s ± 0.011 s [User: 2.053 s, System: 0.660 s]
Range (min … max): 1.791 s … 1.820 s 10 runs
Benchmark #3: build-gcc-10/dwarfs_test
Time (mean ± σ): 2.027 s ± 0.004 s [User: 2.270 s, System: 0.797 s]
Range (min … max): 2.023 s … 2.032 s 10 runs
Benchmark #4: build-gcc-9/dwarfs_test
Time (mean ± σ): 2.033 s ± 0.005 s [User: 2.278 s, System: 0.796 s]
Range (min … max): 2.027 s … 2.040 s 10 runs
Summary
'build-clang-10/dwarfs_test' ran
1.01 ± 0.01 times faster than 'build-clang-11/dwarfs_test'
1.13 ± 0.01 times faster than 'build-gcc-10/dwarfs_test'
1.14 ± 0.01 times faster than 'build-gcc-9/dwarfs_test'
These measurements were made with gcc-9.3.0, gcc-10.2.0, clang-10.0.1 and clang-11.0.1.
### Building