Gcc/g++/gfortran equivalent of /Qunroll:4 is -funroll-loops -param max-unroll-times=4Īs pointed out earlier, Intel compilers under VS GUI default to /Qipo, which is equivalent to gnu -flto. Gfortran equivalent of /Qopt-matmul is -fexternal-blas (can use MKL, ACML, libblas et al.) These options imply /complex-limited-range (-fcx-limited-range) and have some limitations on handling of division/sqrt. Gcc/g++/gfortran equivalent of /fp:fast=2 is -ffast-math. Sergey, your option set is more complicated than g++ !
#Note 4 versus note 7 linpack benchmark Pc#
I have a task of testing a Linpack 100x100 Benchmark in C/C++ for PC on my list for a long time and I hope that I'll be able to allocate some time and complete it. In a more complex case, with a Strassen Heap-Based algorithm for matrix multiplication, a ~12-year old Borland C++ v5.x outperformed (!) modern C++ compilers ( Intel / MS / MinGW ) with one thread and a single-precision data type, but it "lost a battle" for a double-precision data type. data type ( single- or double-precision )įor example, I tested a MergeSort algorithm and Intel C++ compiler v12.x gave the best results when all optimizations were disabled (!).
#Note 4 versus note 7 linpack benchmark software#
During last a couple of months we had a couple of short discussions on different forums, like TBB or Software Optimization, about benchmarking and I'd like to repeat that it depends on many factors, like: Has anyone recently (in 2012) done any serious benchmarking of these compilers? Or can you share the benchmark tests of your production code? Which compile options give you best results? 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 ). However, a Warning Level 5 '/W5' of Intel C++ compiler is awesome. I didn't have a chance to work with Clang C++ compiler. So some projects are switching from gcc to But Clang has excellent compile errors and warnings, and its static analysis is just superb. But I have recently tested those compilers on my project (about 120k lines of C) on OpenSUSE 12.2, and things have changed radically.
0 kommentar(er)
