Difference between revisions of "User:Le Forgeron/vault/Compilation"
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Le Forgeron (talk | contribs) (Created page with "Tested on Ubuntu 13.04, 64 bits system (x86_64) My preference is to not be bothered with io-restrictions, but your mileage may vary. == gcc (Gnu) == * version 4.7.3 # ./con...") |
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Compiler version: icpc 13.0.1 | Compiler version: icpc 13.0.1 | ||
Compiler flags: -pipe -Wno-multichar -Wno-write-strings -s -O3 -ip -xHost -pthread | Compiler flags: -pipe -Wno-multichar -Wno-write-strings -s -O3 -ip -xHost -pthread | ||
| + | |||
| + | |||
| + | == Which one to choose == | ||
| + | |||
| + | Remember that your mileage might vary. | ||
| + | |||
| + | Personal conclusions: | ||
| + | # Icc is best. | ||
| + | # Clang is better than Gcc as long as no HT core are available. | ||
| + | # Gcc is better than Clang when HT cores are available. | ||
| + | # an HT core is worth only 0.2 to 0.25 a real core. | ||
| + | |||
| + | X-axis: number of thread (-WT option of povray) | ||
| + | Y-axis: relative performance (the higher the better) | ||
| + | |||
| + | [[File:LeForgeron_i7_980_povperf.png]] | ||
Revision as of 12:56, 22 September 2013
Tested on Ubuntu 13.04, 64 bits system (x86_64)
My preference is to not be bothered with io-restrictions, but your mileage may vary.
gcc (Gnu)
- version 4.7.3
- ./configure COMPILED_BY="Jérôme Grimbert <[email protected]>" --disable-io-restrictions
I/O restrictions: disabled X Window display: enabled (using SDL) Supported image formats: gif tga iff ppm pgm hdr png jpeg tiff openexr Unsupported image formats: - Compilation settings: Build architecture: x86_64-unknown-linux-gnu Built/Optimized for: x86_64-unknown-linux-gnu (using -march=native) Compiler vendor: gnu Compiler version: g++ 4.7 Compiler flags: -pipe -Wno-multichar -Wno-write-strings -fno-enforce-eh-specs -s -O3 -ffast-math -march=native -pthread
clang (LLVM)
- version 3.2-1
- ./configure COMPILED_BY="Jérôme Grimbert <[email protected]>" --disable-io-restrictions CXX=clang++ CC=clang
I/O restrictions: disabled X Window display: enabled (using SDL) Supported image formats: gif tga iff ppm pgm hdr png jpeg tiff openexr Unsupported image formats: - Compilation settings: Build architecture: x86_64-unknown-linux-gnu Built/Optimized for: x86_64-unknown-linux-gnu (using -march=native) Compiler vendor: gnu Compiler version: clang++ 4.2.1 Compiler flags: -pipe -Wno-multichar -Wno-write-strings -O3 -ffast-math -march=native -pthread
icc (Intel)
- version 13.0.1
- ./configure COMPILED_BY="Jérôme Grimbert <[email protected]>" --disable-io-restrictions CXX=icpc CC=icc CPPFLAGS=-I/usr/include/x86_64-linux-gnu/c++/4.7
I/O restrictions: disabled X Window display: enabled (using SDL) Supported image formats: gif tga iff ppm pgm hdr png jpeg tiff openexr Unsupported image formats: - Compilation settings: Build architecture: x86_64-unknown-linux-gnu Built/Optimized for: x86_64-unknown-linux-gnu (using -xHost) Compiler vendor: intel Compiler version: icpc 13.0.1 Compiler flags: -pipe -Wno-multichar -Wno-write-strings -s -O3 -ip -xHost -pthread
Which one to choose
Remember that your mileage might vary.
Personal conclusions:
- Icc is best.
- Clang is better than Gcc as long as no HT core are available.
- Gcc is better than Clang when HT cores are available.
- an HT core is worth only 0.2 to 0.25 a real core.
X-axis: number of thread (-WT option of povray) Y-axis: relative performance (the higher the better)
