On  9 Jan, mirtchov@cpsc.ucalgary.ca wrote:
> Rog at vitanuova already caught how stupid the following article is
> (linked to from slashdot):
>
> 	http://osnews.com/story.php?news_id=5602
>
> It took me much longer -- until I looked at their "C" code (term used
> very loosely) trying to compile it on Plan 9...  There are multiple
> gems in it including ++ on a double, mid-function variable definitions
> (C-code, right?), log10(0.0), impossible to look at I/O, etc.  In
> fact, I'm attaching the benchmark for your viewing pleasure :)
>
> Anyway, the exercise took very little time and here are some "results"
> showing how good Plan 9's compiler are (where's a Bushnell when you
> need one?), it would be interesting to see how the long arithmetic can be improved:
>
> pcc (code untouched except for mid-function variable definitions moved to top):
>
> 	Int arithmetic elapsed time: 17540 ms with intMax of 1000000000
> 	 i: 1000000001
> 	 intResult: 1
> 	Double arithmetic elapsed time: 65500 ms with doubleMin 10000000000.000000, doubleMax 11000000000.000000
> 	 i: 11000000000.000000
> 	 doubleResult: 10011632717.495501
> 	Long arithmetic elapsed time: 262540 ms with longMin I64d, longMax I64d
> 	 i: I64d
> 	 longResult: I64d
> 	Trig elapsed time: 25070 ms with max of 10000000
> 	 i: 10000000.000000
> 	 sine: 0.990665
> 	 cosine: -0.136322
> 	 tangent: -7.267119
> 	 logarithm: 7.000000
> 	 squareRoot: 3162.277502
> 	[crashes during the last test while reading back the file it just wrote]
>
> gcc (code untouched, no -O):
>
> 	Int arithmetic elapsed time: 23770 ms with intMax of 1000000000
> 	 i: 1000000001
> 	 intResult: 1
> 	Double arithmetic elapsed time: 56040 ms with doubleMin 10000000000.000000, doubleMax 11000000000.000000
> 	 i: 11000000000.000000
> 	 doubleResult: 10011632717.495501
> 	Long arithmetic elapsed time: 53500 ms with longMin I64d, longMax I64d
> 	 i: I64d
> 	 longResult: I64d
> 	Trig elapsed time: 30680 ms with max of 10000000
> 	 i: 10000000.000000
> 	 sine: 0.990665
> 	 cosine: -0.136322
> 	 tangent: -7.267119
> 	 logarithm: 7.000000
> 	 squareRoot: 3162.277502
> 	[crashes during the last test while reading back the file it just wrote]
>
> 8c (modified to use nsec() for timing, printf -> print, fixed log10(0.0) crash, fix %I64d in print()):
>
> 	Int arithmetic elapsed time: 17517 ms with intMax of 1000000000
> 	 i: 1000000001
> 	 intResult: 1
> 	Double arithmetic elapsed time: 22525 ms with doubleMin 10000000000.000000, doubleMax 11000000000.000000
> 	 i: 11000000000.000000
> 	 doubleResult: 10011632717.495500
> 	Long arithmetic elapsed time: 565067 ms with longMin 10000000000, longMax 11000000000
> 	 i: 11000000000
> 	 longResult: 776627965
> 	Trig elapsed time: 25881 ms with max of 10000000
> 	 i: 10000000.100000
> 	 sine: 0.972106
> 	 cosine: -0.234542
> 	 tangent: -4.144701
> 	 logarithm: 7.000000
> 	 squareRoot: 3162.277518
>
>
> It is important to note that the integer performance of 8c is
> comparable to gcc 3.3's -O[23] running on Plan 9 and Linux
> respectively.  The double arithmetic lags by about 20%.  The I/O is
> comparable (2x slower when going over a 100mbit link, no caching).
>
> Profiling the long long code to see where it looses all that time may
> be interesting.
>
> All computation performed on a 8-way 700mhz Xeon, only 1 cpu used :)
>
> Sorry for wasting your time -- just wanted to see how good 8c was and
> got caught in all the other crap. It's Friday after all... :)
>
> Andrey

That's what I get on SGI Octane R12k/270MHz with the MIPSpro 7.3 C++
compiler as my MIPSpr C compiler is too much standard...

Start C benchmark
Int arithmetic elapsed time: 32870 ms with intMax of 1000000000
 i: 1000000001
 intResult: 1
Double arithmetic elapsed time: 21700 ms with doubleMin 10000000000.000000, doubleMax 11000000000.000000
 i: 11000000000.000000
 doubleResult: 10011632717.495501
Long arithmetic elapsed time: 72920 ms with longMin I64d, longMax I64d
 i: I64d
 longResult: I64d
Trig elapsed time: 5730 ms with max of 10000000
 i: 10000000.000000
 sine: 0.990665
 cosine: -0.136322
 tangent: -7.267119
 logarithm: 7.000000
 squareRoot: 3162.277502
I/O elapsed time: 3540 ms with max of 1000000
 last line: abcdefghijklmnopqrstuvwxyz1234567890abcdefghijklmnopqrstuvwxyz1234567890abcdefgh
Total elapsed time: 136760 ms
Stop C benchmark
--
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