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Article #323Re: Nasa har gjort egna prestandatester av G5:an...
From: Bjarne Bäckström
Date: Sun, 06 Jul 2003 12:30
Date: Sun, 06 Jul 2003 12:30
29 lines
2481 bytes
2481 bytes
Erik Richard S�rensen <kml.ers@mail1.stofanet.dk> wrote:
[...]
> > 2. Vektorisering testades inte p� n�gon av plattformarna (SSE2 eller
> > Altivec).
>
> Hm... Hvad skulle NASA egentlig med vektorisering?
>
Det framg�r i artikeln:
"Background: Jet3D
Jet3D is a jet noise prediction tool based on Lighthill's
Acoustic Analogy. Jet3D takes an existing Reynolds-averaged
Navier-Stokes (RANS) CFD simulation of a jet flow as input data
and post-processes it to compute jet noise. Two versions of Jet3D
are tested here: the original double precision scalar code
("scalar"), and a mixed single and double precision vector code
with approximate spectral integration ("vector"). In the latter
version of the code, key portions of the Jet3D algorithm were
rewritten to take advantage of AltiVec for increased in
performance. The scalar version of the code is written entirely
in FORTRAN (a mix of F77 and F90), while the vector version of
the code is a mix of FORTRAN and C. Because of its dependence on
AltiVec, the vector version of Jet3D runs on G4 and G5 systems
only."
--
http://w1.503.telia.com/~u50302970/
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X-Google-Language: ENGLISH,ASCII X-Google-Thread: f6dce,8ddf0ecf7a064c38 X-Google-Attributes: gidf6dce,public X-Google-Thread: ffdd6,8ddf0ecf7a064c38 X-Google-Attributes: gidffdd6,public X-Google-Thread: 113201,8ddf0ecf7a064c38 X-Google-Attributes: gid113201,public X-Google-ArrivalTime: 2003-07-06 05:40:06 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!logbridge.uoregon.edu!news.tele.dk!news.tele.dk!small.news.tele.dk!news.algonet.se!algonet!oden.abc.se!bskb From: bskb@m.a.c.com (Bjarne Bäckström) Newsgroups: swnet.sys.mac,no.it.os.mac.diverse,dk.edb.mac Subject: Re: Nasa har gjort egna prestandatester av G5:an... Date: Sun, 6 Jul 2003 14:30:07 +0200 Organization: Design & Programming, Industrial Automation Lines: 29 Message-ID: <1fxoiqp.9tg0uf9mjbkeN%bskb@m.a.c.com> References: <1fxocjd.1fmrgec4hjywnN%i97_bedREMOVETHIS@i.kth.se> <mr-D83CCC.12293206072003@news.fu-berlin.de> <3F080D95.F2C6B9E6@mail1.stofanet.dk> NNTP-Posting-Host: dialup-47.abc.se Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: oden.abc.se 1057494606 9625 195.17.73.47 (6 Jul 2003 12:30:06 GMT) X-Complaints-To: abuse@abc.se NNTP-Posting-Date: Sun, 6 Jul 2003 12:30:06 +0000 (UTC) User-Agent: MacSOUP/2.5b3 (Mac OS 9.2.2)