From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Thread: 103376,7767a311e01e1cd X-Google-Attributes: gid103376,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news2.google.com!news3.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!nx02.iad01.newshosting.com!newshosting.com!204.127.204.224.MISMATCH!wns14feed!worldnet.att.net!attbi_s71.POSTED!53ab2750!not-for-mail From: "Jeffrey R. Carter" Organization: jrcarter at acm dot org User-Agent: Thunderbird 1.5.0.7 (Windows/20060909) MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: GNAT compiler switches and optimization References: <1161341264.471057.252750@h48g2000cwc.googlegroups.com> <9Qb_g.111857$aJ.65708@attbi_s21> <434o04-7g7.ln1@newserver.thecreems.com> <4539ce34$1_2@news.bluewin.ch> <453A532F.2070709@obry.net> <9kfq04-sgm.ln1@newserver.thecreems.com> <5vgs04-64f.ln1@newserver.thecreems.com> <453bc74e$0$19614$426a74cc@news.free.fr> <4jit04-0gq.ln1@newserver.thecreems.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Message-ID: NNTP-Posting-Host: 12.201.97.213 X-Complaints-To: abuse@mchsi.com X-Trace: attbi_s71 1161588715 12.201.97.213 (Mon, 23 Oct 2006 07:31:55 GMT) NNTP-Posting-Date: Mon, 23 Oct 2006 07:31:55 GMT Date: Mon, 23 Oct 2006 07:31:55 GMT Xref: g2news2.google.com comp.lang.ada:7155 Date: 2006-10-23T07:31:55+00:00 List-Id: Jeffrey Creem wrote: > > Having said that, I did update the wiki site with some timing numbers > people asked for from a dual processor machine. > > http://gnuada.sourceforge.net/pmwiki.php/Main/Oct2006CLAGFORTRANComparison > > Scroll to the bottom and start reading at "Other Versions" if you are > interested. This is getting too messy for plain text conversation. Wow, a greater than 50% speedup from using 2 tasks instead of 1 (from ada/tst_array to ada/tst_array_task_2). Something is odd there. This shows that, for those with dual-processor machines, easy-to-create Ada is faster than easy-to-create FORTRAN. This doesn't help those with single processors, of course. I doubt if anything will beat matmul (short of 640_000 processors). But Ada with explicit loops and FORTRAN with matmul are hardly equivalent. You need to convention-FORTRAN the Ada array type, import matmul, and call it to get a fair comparison. There shouldn't be much difference. -- Jeff Carter "I unclog my nose towards you." Monty Python & the Holy Grail 11