Groups > comp.programming.threads > #2540

Re: To Melzzzzz

From	Melzzzzz <mel@zzzzz.com>
Newsgroups	comp.programming, comp.programming.threads
Subject	Re: To Melzzzzz
Date	2014-06-29 17:20 +0200
Organization	albasani.net
Message-ID	<loparl$9ui$5@news.albasani.net> (permalink)
References	(2 earlier) <lop839$ute$1@dont-email.me> <lop8fk$9ui$3@news.albasani.net> <lop8tr$7ra$1@dont-email.me> <lop9ml$9ui$4@news.albasani.net> <lopafm$jkg$1@dont-email.me>

Cross-posted to 2 groups.

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On Sun, 29 Jun 2014 11:14:31 -0700
Ramine <ramine@1.1> wrote:

 so it is not auto-vectorizing the code... so that's amazing.
> how then gcc is generating 2X times faster code than Delphi and
> FreePascal ? i think that Delphi and FreePascal are slow compilers.

gcc - C and C++ is being developed at fast pace and improved constantly.
Many many commits. 
Hack gcc is even better than intel icc now, I think.

bmaxa@maxa:~/examples/forth/sci$ gcc-trunk -Ofast -mavx *.c -o scimark2
-lm bmaxa@maxa:~/examples/forth/sci$ time ./scimark2 
**                                                              **
** SciMark2 Numeric Benchmark, see http://math.nist.gov/scimark **
** for details. (Results can be submitted to pozo@nist.gov)     **
**                                                              **
Using       2.00 seconds min time per kenel.
Composite Score:         2147.56
FFT             Mflops:  1810.43    (N=1024)
SOR             Mflops:  1848.91    (100 x 100)
MonteCarlo:     Mflops:   631.23
Sparse matmult  Mflops:  2253.35    (N=1000, nz=5000)
LU              Mflops:  4193.91    (M=100, N=100)

real	0m28.592s
user	0m28.516s
sys	0m0.050s
bmaxa@maxa:~/examples/forth/sci$ icc -fast -mavx *.c -o scimark2 -lm
bmaxa@maxa:~/examples/forth/sci$ time ./scimark2 
**                                                              **
** SciMark2 Numeric Benchmark, see http://math.nist.gov/scimark **
** for details. (Results can be submitted to pozo@nist.gov)     **
**                                                              **
Using       2.00 seconds min time per kenel.
Composite Score:         2079.37
FFT             Mflops:  1707.05    (N=1024)
SOR             Mflops:  1527.84    (100 x 100)
MonteCarlo:     Mflops:  1203.64
Sparse matmult  Mflops:  1695.46    (N=1000, nz=5000)
LU              Mflops:  4262.85    (M=100, N=100)

real	0m27.656s
user	0m27.601s
sys	0m0.034s

(Intel seems that autovectorize MonteCarlo, which gcc don't)
but overal intel is slower.

> 
> 
> 
> Thank you,
> Amine Moulay Ramdane.
> 
> 
> 
> 



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Thread

To Melzzzzz Ramine <ramine@1.1> - 2014-06-28 15:51 -0700
  Re: To Melzzzzz Melzzzzz <mel@zzzzz.invalid> - 2014-06-29 04:10 +0200
    Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 10:33 -0700
      Re: To Melzzzzz Melzzzzz <mel@zzzzz.com> - 2014-06-29 16:39 +0200
        Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 10:47 -0700
          Re: To Melzzzzz Melzzzzz <mel@zzzzz.com> - 2014-06-29 17:00 +0200
            Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 11:14 -0700
              Re: To Melzzzzz Melzzzzz <mel@zzzzz.com> - 2014-06-29 17:20 +0200
              Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 11:23 -0700
                Re: To Melzzzzz Melzzzzz <mel@zzzzz.com> - 2014-06-29 17:31 +0200
                Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 11:32 -0700
                Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 11:38 -0700
    Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 10:41 -0700
      Re: To Melzzzzz Melzzzzz <mel@zzzzz.invalid> - 2014-06-29 16:46 +0200
        Re: To Melzzzzz Ramine <ramine@1.1> - 2014-06-29 10:54 -0700

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