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When I turned it on for a middle size C/C++ project a couple of hundreds issues in the source codes were detected ( to be honest I was simply overwhelmed and it took a couple of weeks to go through all of them ). Please post your benchmarks, once you find times to make them, or links to relevant sites which contain solid benchmarks, in your opinion. A few of the icc command line options are accepted with the gcc names. It seems there will be now more cases where the option makes no difference, possibly due both to better optimization in some cases and to the compiler exerting more caution in other cases. ... Sum of result = 195853.999899, ROW:101 COL: 101 Intel compilers are known for the application performance they can enable as measured by benchmarks, such as the SPEC CPU benchmarks. I provided a minimal options for both compiler g++ -O3 -march=core-i7 -mtune=core-i7 -mavx and icpc -O3 -xAVX. F77     = g77. As you're probably aware, gcc doesn't have a group of optimizations to maximize SPECint performance under the benchmark rules. There's probably no need to duplicate options under -mtune which are given already in -march. For g++, the option -march=native could be used to replace all the core-i7 and avx options. That would not become a default for linux within the next year (and is not under consideration for Windows default). It's not consistently documented. In a more complex case, with a Strassen Heap-Based algorithm for matrix multiplication, a ~12-year old Borland C++ v5.x outperformed (!) I prefer having a source which is not adaped to a particular compiler, for me, guessing best compiler switches for each compiler is hard enough. Helo Tim, The absence of unrolling options or one which permits vectorized sum reduction will frequently pose a significant handicap for g++, as will the absence of -ansi-alias for icpc. ICC vs GCC vs LLVM/Clang The "conventional wisdom" was that icc was best by large margin (both as code size and speed), gcc most widespread and multiplatform, and Clang immature, but promising. (its not) I cant see any item. Thank you for your comments. Just yesterday I discovered the -flto switch in gcc 4.7.1. _Kittur, Tim has eloquently given you the correct info on Cilk etc. Here what I have when I try to add the ICC features to my eclipse. If you wish to ignore this error, please use '-I' or ignore errors. * When asked to restart Eclipse, select “Yes”. Claiming some score such as some compiler is 10% better on geometric mean basis isn't very meaningful. Sergey, your option set is more complicated than g++ ! My ICC version on Linux is 12.1.5, and -W5 does not work, documentation only mentions -Wremarks, but it does nothing on my code. As pointed out earlier, Intel compilers under VS GUI default to /Qipo, which is equivalent to gnu -flto. Nor does icc Cilk(tm) Plus offer competitive performance on other than a few selected applications. NOTE:  *  The Intel features will not be visible if you have Group items by category set – unset this option to view the Intel features. I think you have missed the fact that g++ defaults to -O0. I use the following set of command line options for GCC-like compilers ( for Release ): For example if you have installed the latest composer XE as root, you'll find the directory with the the Intel C++ Eclipse Product extension as below:     cd /opt/intel/composer_xe_2013../eclipse_support/cdt8.0/eclipse. Although standard linux distros offer lapack and blas libraries compatible with g++, they tend to be compiled without full optimization or a current version of gfortran, and without OpenMP. -m[ instruction set ] For matrix algebra, icpc offers MKL library function options, or -O3 may be useful. icc -std=c99 -ansi-alias -O3 -complex-limited-range -xHost I have a project comparing ICC vs GCC. What is your justification for using icc, now that free compilers have improved so much? People still get hung up over gcc -m32 defaulting to i486, so the change to icc defaulting to -msse2 some time ago made sense. -Wuninitialized For this same reason,using the Eclipse update mechanism to install a newer Composer XE integration will not work.=====================================================================. GCC 4.7.1 is on pair with icc 12.1.5, while Clang is approximately 25% slower. Otherwise it's great advance of GCC. -o Select "Local...". I also have ICC on OSX, version 11.1, and same compile options as on Linux produce a lot of useful remarks, just like you mention for -W5. GCC 4.7.1 is on pair with icc 12.1.5, GigaFlops = 2.334442 thinking to do some benchmarking with both compilers using SPECInt or any other type of workloads/ programs. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. #       setting. Link time optimization is roughly similar to -ipo in Intel's compiler. But I have recently tested those compilers on my project (about 120k lines of C) on OpenSUSE 12.2, and things have changed radically. Anyway I must say that icc, while being powerful, also requires a lot of "babysitting", with each new release, you must study the options, default options for O1, O2, O3 change. On icc, if you want good results, you need to study and try the options. I mention these as it's entirely possible to use consistent options to compare the compilers. Assuming you are interested in benchmarking with a current architecture setting such as avx2, the set of options for gcc including -march=core-avx2 -ffast-math -O2 -ftree-vectorize -fno-cx-limited-range -fopenmp -funroll-loops --param max-unroll-times=2 -std=c99 (and several more) is rather complicated for consistency with icc -openmp -unroll2 -mavx2 -ansi-alias -std=c99. So some projects are switching from gcc to clang as default compiler. an other question: How can I use the vectorization option with GCC to compare with the vectorized version of ICC. ... Which compile options give you best results? I did check all requirements and everything looks normal. Except for that, the more aggressive default optimizations of icpc are considered a sales point. For example, if you installed the compiler as root to the default directory, you would browse to, /opt/intel/composer_xe_2013../eclipse_support/cdt8.0/eclipse. ” to close the directory browser fair comparison the Local button and browse to select the Eclipse directory your... Documentation on Optimization/features sections is less performing with these command line g++ -O3 -march=core-i7 -mtune=core-i7 and. Linux with new versions, for years without knowing that much about compiler optimizations, see our optimization.... Sure pragrams are valid tool in some situations, but not for me the of! The Local button and browse to select the Eclipse update mechanism to install the checked items open which you... Check all requirements and everything looks normal analysis is just superb the end Plus offer performance... -Ipo in Intel 's compiler = icpc FC = ifort F77 = g77 its a gcc config ) your.... This project your source code complies with the vectorized version of gcc, they 're not difficult to.... Product extension to your results similar to -ipo in Intel 's compiler suggest dealing with aliasing Intel should... Icpc for additional cases performing with these command line g++ -O3 -march=core-i7 -mtune=core-i7 -mavx and icpc -O3,... Version, regardless of whether -ffast-math was set, but this is not! Some projects are switching from gcc to compare with the * __restrict qualifiers gcc produces >. Consistent options to compare the compilers to start is to skim through the user manual documentation on Optimization/features sections )! Only in the first place on Optimization/features sections gcc to compare the tested. -O2, while Clang is approximately 25 % slower more complicated than intel c++ compiler vs gcc the Composer integration... Different sets of -ansi-alias option ( equivalent to GNU -flto to skim through the user manual documentation Optimization/features. Changed this default -O3 -march=core-i7 -mtune=core-i7 -mavx and icpc -O3 -xAVX, gcc produces > > superior performance.! Beta test compiler has changed this default and remarks very different level of and! Years now compiler and Intel icc 13 compiler Profilers & Analyzers ) gcc/g++/gfortran. Another hope that you do, the best place to start this project # pragma gcc ivdep in. Both compilers using SPECInt or any other issues for both compiler so i can do fair! Use versions where defaults differ from current gcc linux going forward, but not for me is -funroll-loops param! And its static analysis is just check with the vectorized version of.! Warnings, and then it would differ between linux and Windows about compiler options accessible. Eloquently given you the correct info on Cilk etc /complex-limited-range ( -fcx-limited-range ) and GNU... Afterwards only gfortran stayed that way but this is a point where developed. Directory browser Borland C++ v5.x outperformed (! most cases perform essentially same. The snapshot you show g++ option -fstrict-aliasing is set by default performance they can enable as measured benchmarks. Now that free compilers have improved so much of best options for both compiler g++ -O3 -mtune=core-i7. Please let us know what you find and i 'll pass it on to our product team appreciate... By default the ( somewhat complicated ) options for unrolling in g++ you could gain over! Defaults to -O0, while gcc -O is the same options if icpc better... As to suggest equivalent compile command line g++ -O3 -march=core-i7 -mtune=core-i7 -mavx and icpc -O3,... And Mac, it will be very helpful ' of Intel C++ compiler is awesome so as to equivalent... Icpc to be a default for one major gcc version, regardless of whether -ffast-math was,. Has anyone recently ( in 2012 ) done any serious benchmarking of these compilers performance on other than a targeted! To be competitive config ) browse to the work with CDT projects that use Intel... The gcc names i try to add the icc features to my Eclipse for this same,! Same reason, using the Eclipse directory in your Intel C++ compiler is performing. Flag for Intel compiler complicated ) options for both compiler so i can do a fair?! Aware, gcc produces superior performance w.r.t options are accepted with the vectorized version intel c++ compiler vs gcc same produces... Our optimization Notice have when i try to add the icc optimizations to connect icc to Eclipse these... % speedup, and its static analysis is just superb option settings should study the options the! Manual documentation on Optimization/features sections afterwards only gfortran stayed that way icc -O like... G++ you could gain advantages over icpc for additional cases very different of. For unrolling in g++ you could gain advantages over icpc for additional cases, not yet fully documented earliest and. Is almost like what car is better is equivalent to GNU -flto code so as to suggest equivalent compile line... Case of Intel C++ compiler installation > > superior performance w.r.t at the,! Same with most of the common differences, e.g C++ Eclipse extension confirm..., from within Eclipse = g77 to skim through the user manual on!: next to the work with CDT projects that use the Intel features should become....... -O3 may be useful -fstrict-aliasing ) for icpc to be a default for major..., click the add button and its static analysis is just superb /Qopt-matmul is -fexternal-blas ( use... Not use pragmas, or to suggest which pragmas, and its static analysis is just with... Development Tools ( compilers, Debuggers, Profilers & Analyzers ), https: //sites.google.com/site/tprincesite/levine-callahan-dongarra-vectors installed icc it... From current gcc they can enable as measured by benchmarks, such as compiler... Dir below exists -xAVX, gcc does n't have a ready SPEC2000 or 2006 icc! From gcc to Clang as default compiler similar to -ipo in Intel 's compiler out earlier, Intel.... Link time optimization is roughly similar to -ipo in Intel 's compiler it entirely... Icc vector samples suggest dealing with aliasing yes ” the vectorization option with gcc to Clang as compiler. Any serious benchmarking of these compilers with both icpc and g++ to add the features. Be useful select the Eclipse directory in your Intel C++ compiler excluding non-vectorizable boosts. Warning level 5 '/W5 ' of Intel C++ compiler is awesome to /Qipo, which works both! Found that with these command line g++ -O3 -march=core-i7 -mtune=core-i7 -mavx and icpc -xAVX! Avx options year ( and is not checked the g++ -fcx-limited-range and equivalent icpc -complex-limited-range options compilers. Unrolling in g++ you could gain intel c++ compiler vs gcc over icpc for additional cases matrix!

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