From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 25777 invoked by alias); 7 Nov 2009 19:00:42 -0000 Received: (qmail 25749 invoked by uid 48); 7 Nov 2009 19:00:29 -0000 Date: Sat, 07 Nov 2009 19:00:00 -0000 Message-ID: <20091107190029.25748.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug fortran/41977] gfortran -fopenp and ACML_MP seem incompatible In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "kargl at gcc dot gnu dot org" Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2009-11/txt/msg00650.txt.bz2 ------- Comment #9 from kargl at gcc dot gnu dot org 2009-11-07 19:00 ------- Even without acml, there appears to be an issue. gfortran44 -o one -O2 -pipe -march=native one.f90 -L/usr/local/lib \ -llapack -lblas -fopenmp ./one fred_f_1000 LAPACK Cholesky time = .27 seconds, CPU = .27 seconds LAPACK solver time = 2.48 seconds, CPU = 2.47 seconds Coded Cholesky time = .81 seconds, CPU = 1.47 seconds Coded solver time = 33.76 seconds, CPU = 38.68 seconds gfortran44 -o one -O2 -pipe -march=native one.f90 \ -L/usr/local/lib -llapack -lblas ./one fred_f_1000 LAPACK Cholesky time = .30 seconds, CPU = .30 seconds LAPACK solver time = 2.49 seconds, CPU = 2.49 seconds Coded Cholesky time = 1.36 seconds, CPU = 1.36 seconds Coded solver time = 2.97 seconds, CPU = 2.96 seconds OpenMP clearly helps the 'Coded Cholesky time', but it causes a factor of 10 degradation in the 'Coded solver time'. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41977