Ubuntu : Intel® Q6600® quad-core
Computer Language Benchmarks Game      [[ Play ]]

- all benchmarks - n-body fannkuch-redux meteor-contest fasta fasta-redux spectral-norm reverse-complement mandelbrot k-nucleotide regex-dna pidigits chameneos-redux thread-ring binary-trees-redux binary-trees - all languages - Ada 2005 GNAT ATS C gcc Clojure C# Mono C++ g++ Dart Erlang HiPE F# Mono Fortran Intel Go Haskell GHC Java 7 Lisp SBCL OCaml Pascal Free Pascal Perl PHP Python 3 Racket Ruby 2.0 Ruby JRuby Scala

÷ Ada 2005 GNAT ATS C gcc Clojure C# Mono C++ g++ Dart Erlang HiPE F# Mono Fortran Intel Go Haskell GHC Java 7 Lisp SBCL OCaml Pascal Free Pascal Perl PHP Python 3 Racket Ruby 2.0 Ruby JRuby Scala x86 one core x64 quad-core x86 quad-core x64 one core

 1 : Are the C++ g++ programs faster? At a glance.

Each chart bar shows, for one unidentified benchmark, how much the fastest C++ g++ program used compared to the fastest C gcc program.

These are not the only compilers and interpreters. These are not the only programs that could be written. These are not the only tasks that could be solved. These are just 10 tiny examples.

 2 : Are the C++ g++ programs faster? Approximately.

Each table row shows, for one named benchmark, how much the fastest C++ g++ program used compared to the fastest C gcc program.

C++ g++ used what fraction? used how many times more?
Benchmark	Time	Memory	Code
k-nucleotide	1/2	±	1/2
fasta	±	2×	±
mandelbrot	±	±	±
fannkuch-redux	±	3×	±
spectral-norm	±	±	2×
pidigits	±	2×	2×
n-body	±	3×	±
fasta-redux	±	2×	±
reverse-complement	±	±	3×
binary-trees	2×	2×	±
regex-dna	2×	1/2	1/4

C++ g++ used what fraction? used how many times more?
Time-used	|-	|---	25%	median	75%	---|	-|
(Elapsed secs)	1/2	1/2	±	±	±	2×	2×

± read the measurements and then read the program source code.

 3 : Are the C++ g++ programs faster? Measurements.

These are not the only tasks that could be solved. These are just 10 tiny examples. These are not the only compilers and interpreters. These are not the only programs that could be written.

For each named benchmark, measurements of the fastest C++ g++ program are shown for comparison against measurements of the fastest C gcc program.

Program Source Code	CPU secs	Elapsed secs	Memory KB	Code B	≈ CPU Load
k-nucleotide
C++ g++	23.39	7.40	138,100	1252	73% 74% 74% 97%
C gcc	39.88	14.64	153,688	2280	96% 92% 50% 36%
fasta
C++ g++	4.10	4.11	620	1105	55% 0% 0% 46%
C gcc	4.92	4.93	292	1221	0% 0% 100% 0%
mandelbrot
C++ g++	19.64	5.10	32,076	726	95% 95% 95% 100%
C gcc	23.25	5.83	27,596	799	100% 100% 100% 100%
fannkuch-redux
C++ g++	49.71	12.69	996	1440	98% 100% 94% 100%
C gcc	51.38	13.07	332	1557	96% 100% 100% 98%
spectral-norm
C++ g++	7.96	2.00	924	1044	100% 100% 100% 100%
C gcc	8.02	2.02	644	569	100% 100% 100% 100%
pidigits
C++ g++	2.68	2.68	1,452	682	1% 0% 1% 99%
C gcc	2.49	2.50	864	448	21% 0% 0% 80%
n-body
C++ g++	10.55	10.56	868	1749	57% 0% 0% 43%
C gcc	8.85	8.85	336	1490	0% 0% 100% 1%
fasta-redux
C++ g++	2.17	2.17	620	1474	0% 0% 100% 1%
C gcc	1.67	1.67	292	1321	1% 0% 100% 1%
reverse-complement
C++ g++	1.22	0.84	245,428	2275	19% 31% 12% 88%
C gcc	0.92	0.65	248,632	741	17% 31% 83% 16%
binary-trees
C++ g++	19.06	6.60	173,960	892	60% 92% 75% 65%
C gcc	14.38	4.32	103,396	850	81% 90% 99% 72%
regex-dna
C++ g++	6.08	4.54	173,240	695	1% 77% 1% 57%
C gcc	6.07	2.69	291,964	2579	68% 41% 72% 48%

 4 : Are there other C++ g++ programs for these benchmarks?

Remember - those are just the fastest C++ g++ and C gcc programs measured on this OS/machine. Check if there are other implementations of these benchmark programs for C++ g++.

Ada 2005 GNAT ATS C gcc Clojure C# Mono C++ g++ Dart Erlang HiPE F# Mono Fortran Intel Go Haskell GHC Java 7 Lisp SBCL OCaml Pascal Free Pascal Perl PHP Python 3 Racket Ruby 2.0 Ruby JRuby Scala

Maybe one of those other C++ g++ programs is fastest on a different OS/machine.

 5 : Are there other faster programs for these benchmarks?

Remember - those are just the fastest C++ g++ and C gcc programs measured on this OS/machine. Check if there are faster implementations of these benchmark programs for other programming languages.

n-body fannkuch-redux meteor-contest fasta fasta-redux spectral-norm reverse-complement mandelbrot k-nucleotide regex-dna pidigits chameneos-redux thread-ring binary-trees-redux binary-trees

Maybe one of those other programs is fastest on a different OS/machine.

 C++ g++ : c plus objects plus generics 

C++ 1991-2006, Bjarne Stroustrup (pdf)

Online book: Looking for 4x speedups? SSE to the rescue! pdf slides

gcc (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3

Home Page: http://gcc.gnu.org/

Download: ftp://ftp.gnu.org/pub/gnu/gcc/

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