Date: Mon, 04 Jul 2005 14:12:57 +0900 (JST) From: NAKATA Maho <chat95@mac.com> To: amd64@freebsd.org Cc: netchild@freebsd.org Subject: better optimization flags for opteron (amd64) Message-ID: <20050704.141257.104030539.chat95@mac.com>
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Better optimization flags for Opteron (amd64) Recently AMD released a guide http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/32035.pdf Compiler Usage Guidelines for 64-Bit Operating Systems on AMD64 Platforms it has nice flag settings. recommended flags for opteron/gcc-3.4 is followings: -pipe -O3 -ffast-math -funroll-all-loops -fpeel-loops -ftracer -funswitch-loops -funit-at-a-time (see p.19 of 32035.pdf) and my benchmark of math/sdpara on Opteron 1.6GHz dual shows: * scalapack/mpich/blacs is not optimized 2004.59 real 1979.83 user 9.77 sys * scalapack/mpich/blacs is optimized 1261.85 real 1242.63 user 7.76 sys Hope this helps for you. -- NAKATA, Maho (maho@FreeBSD.org)
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