Re: The Computer Language Shootout Benchmarks


Craig Carey wrote:
On Thu, 04 May 2006 14:01:24 +1200, Craig Carey wrote to comp.lang.ada:
On Tue, 02 May 2006 21:14:19 +0200, Gautier wrote:
Martin Krischik [wrote]
...
"How many times faster or smaller are the Ada 95 GNAT programs than
the corresponding C gcc programs?

"GNAT x times better
- gcc x times better"

...
That gives a narrow to print out backtraces...
. ^ window


I considered that I may have made a mistake in my last message, by
not considering that the figures in the table were found in this
way:

Benchmark timing results for FSF GNAT and GCC C of unknown version,
were T1 and T2.

Compute F = T1 / T2.
The results displayed is: (F - (1 / F))

When T1/T2 < 1 the result displayed is T2/T1, in gray, prefixed by -

Someone looking at GNAT vs C GCC will see the same numbers as someone
looking at C GCC vs GNAT, but with a different sign.


Here is the page after the undefined data-massaging formula is applied
(the formula is not in the FAQ, meaning that debian programmers don't
frequently inquire about the origin of figures finding every compiler
except one to be not-best):

http://shootout.alioth.debian.org/debian/ada.php

| Program & Logs . .Faster . .Smaller: Memory Use . .Smaller: Code Lines
| binary-trees . . . . -1.8 . . . . . . -1.6 . . . . . . . . -1.2 . . .

So GNAt is slower than version ?.?.? Gcc and got a -1.8.

Using the F - 1/F finds that the figure ought be -1.17.

http://shootout.alioth.debian.org/debian/benchmark.php?test=binarytrees&lang=gcc

| binary-trees benchmark | C gcc | binary-trees full data
| binary-trees C gcc program
| N . . . . .Full CPU Time s . . . . Memory Use KB . . . . Code Lines
| 16 . . . . . . . . . . 4.12 . . . . . . . . 4,528 . . . . . . . . 80
| contributed by Kevin Carson

http://shootout.alioth.debian.org/debian/benchmark.php?test=binarytrees&lang=gnat&id=0

| binary-trees benchmark | Ada 95 GNAT | binary-trees full data
| binary-trees Ada 95 GNAT program
| N . . . . .Full CPU Time s . . . . Memory Use KB . . . . Code Lines
| 16 . . . . . . . . . . 7.21 . . . . . . . . 7,360 . . . . . . . . 99
| -- Contributed by Jim Rogers

Calculations:
Full CPU Time:
4.12 / 7.21 = 0.57143 ; 0.57143 - (1 / 0.57143) = -1.17856563
Memory Use:
4528 / 7360 = 0.61522 ; 0.61522 - (1 / 0.61522) = -1.01021
Code Lines:
80 / 99 = 0.80808 ; 0.80808 - (1 / 0.80808) = -0.42942124


The GNAT "pragma Suppress" improves GNAT's timing results by enough to
cause it to be used.

It is not clear why "gcc" has two names at the alioth website: "C gcc",
and "gcc". Ada is part of Gcc and use of svn can show that.

Concluding, the competitor to Ada found that its competitor was
boosted by +53%. (1.8/1.17 = 1.53846154). Though almost certainly an
attack on Ada, there was simply no admission of that, just a straight
face presentation of the bare facts...




Craig Carey













So most of the numbers are nearly all negative.

Thus it is probable that the creator of the website wishes to present
himself/herself as observing that GNAT executables
finish running before they start.

That gives a narrow to print out backtraces...

For a clarification, the "ada.php" webpage shows an image that
contains images of horizontal bars.

Of them I note:

* none are labelled. However the first word on the webpage is
"Debian" (rather than, eg., "Linux").

* Something is labelled in the plot: and that is the horizontal
axis. It has two labels that are not clarified:

(a) "GNAT better" (on the right)
(b) "gcc better" (on the left).

So what is the "-" symbol mean, in the text "- gcc times better".

Special reasoning skills are possibly needed to prevent modifying
scripts so that --sysroot is added to ld linker operations and then
the GNAT compiler is actually built under the FreeBSD emulator.
FreeBSD seems to be getting faster, and maybe the buildword is
less likely to crash too.

Here is the competing Windows "shootout" webpage:

http://dada.perl.it/shootout/





- 4 native solutions
HTH
_______________________________________________________________
Gautier -- http://www.mysunrise.ch/users/gdm/index.htm

Craig Carey

.

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