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-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,38fc011071df5a27 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2003-06-05 05:50:00 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!syros.belnet.be!news.belnet.be!feed.news.nacamar.de!uninett.no!dax.net!juliett.dax.net!not-for-mail Newsgroups: comp.lang.ada Subject: Re: Ideas for Ada 200X References: <6a90b886.0305262344.1d558079@posting.google.com> <3ED41344.7090105@spam.com> <3ED46D81.FF62C34F@0.0> <3ED46E07.4340CABC@0.0> <3ED4F3FD.A0EF7079@alfred-hilscher.de> <6vWcnTWjF83bD0qjXTWcpA@gbronline.com> <3EDCBDF4.1050900@attbi.com> <3EDEC9A7.9050602@attbi.com> <7vy90h2akm.fsf@vlinux.voxelvision.no> From: Ole-Hjalmar Kristensen Message-ID: <7vsmqo3d0t.fsf@vlinux.voxelvision.no> User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.1 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Thu, 05 Jun 2003 12:49:23 GMT NNTP-Posting-Host: 193.216.12.150 X-Complaints-To: abuse@tele2.no X-Trace: juliett.dax.net 1054817363 193.216.12.150 (Thu, 05 Jun 2003 14:49:23 MET DST) NNTP-Posting-Date: Thu, 05 Jun 2003 14:49:23 MET DST Organization: Tele2 Norway AS Public Access Xref: archiver1.google.com comp.lang.ada:38675 Date: 2003-06-05T12:49:23+00:00 List-Id: Ole-Hjalmar Kristensen writes: > "Robert I. Eachus" writes: > > > > add in place--if that is what you want to do. Appended is an Ada > > program that runs eight test cases Integer vs. Float, "+" vs. Add, and > > constraint checking on vs. all checks suppressed. As you can see, in > > this particular case, suppressing checks is a win for Integer, a lose > > for Float. This is fairly typical. (If you compile with GNAT > > remember to invoke gnatmake with -gnato, to enable integer constraint > > checking. Of course, the program should let you know if you forgot.) > > > > E:\Ada\Test\New Folder>test_matrix_add > > test_matrix_add > > Initialize Generators. > > Initialize Integer Matricies. > > Initialize Float Matrices. > > Initialization Completed. > > Integer "+" operator, checks on, required 320.349 milliseconds. > > Integer Add operator, checks on, required 221.992 milliseconds. > > Integer "+" operator, checks off, required 262.464 milliseconds. > > Integer Add operator, checks off, required 170.612 milliseconds. > > Float "+" operator, checks on, required 222.519 milliseconds. > > Float Add operator, checks on, required 150.401 milliseconds. > > Float "+" operator, checks off, required 222.297 milliseconds. > > Float Add operator, checks off, required 171.129 milliseconds. > > All Done. > > > > > As you say, it depends on the system whether or not it pays to turn > off the checks. Here are the results from my system. For Integer > turning off the checks is a win, for Float it does not seem to matter. > One other difference: with checks on, the integer "+" is actually > slightly faster than add. With checks off, it's 3 times slower. > > $ gnatmake -s -gnato -O3 -funroll-loops test_matrix_add > gcc -c -gnato -O3 -funroll-loops test_matrix_add.adb > gnatbind -x test_matrix_add.ali > gnatlink test_matrix_add.ali > > oleh@VOLGA /cygdrive/c/div > $ test_matrix_add > Initialize Generators. > Initialize Integer Matricies. > Initialize Float Matrices. > Initialization Completed. > Integer "+" operator, checks on, required 43.795 milliseconds. > Integer Add operator, checks on, required 45.960 milliseconds. > Integer "+" operator, checks off, required 23.682 milliseconds. > Integer Add operator, checks off, required 8.478 milliseconds. > Float "+" operator, checks on, required 22.506 milliseconds. > Float Add operator, checks on, required 12.920 milliseconds. > Float "+" operator, checks off, required 22.491 milliseconds. > Float Add operator, checks off, required 12.988 milliseconds. > All Done. > > -- > Ole-Hj. Kristensen > > ****************************************************************************** > * You cannot consistently believe this sentence. > ****************************************************************************** Here is another run with forced loop unrolling. Now there is no perceptible difference between having the checks enabled and not. oleh@VOLGA /cygdrive/c/div $ gnatmake -s -gnatp -O3 -funroll-all-loops test_matrix_add gcc -c -gnatp -O3 -funroll-all-loops test_matrix_add.adb gnatbind -x test_matrix_add.ali gnatlink test_matrix_add.ali oleh@VOLGA /cygdrive/c/div $ test_matrix_add Initialize Generators. Initialize Integer Matricies. Initialize Float Matrices. Initialization Completed. Integer "+" operator, checks on, required 22.002 milliseconds. Integer Add operator, checks on, required 8.531 milliseconds. Integer "+" operator, checks off, required 21.705 milliseconds. Integer Add operator, checks off, required 8.384 milliseconds. Float "+" operator, checks on, required 22.103 milliseconds. Float Add operator, checks on, required 12.878 milliseconds. Float "+" operator, checks off, required 22.279 milliseconds. Float Add operator, checks off, required 14.311 milliseconds. All Done. -- Ole-Hj. Kristensen ****************************************************************************** * You cannot consistently believe this sentence. ******************************************************************************