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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 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 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 gcc programs faster? At a glance.

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

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

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

C gcc 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 gcc 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 gcc program are shown for comparison against measurements of the fastest C++ g++ program.

Program Source Code	CPU secs	Elapsed secs	Memory KB	Code B	≈ CPU Load
binary-trees
C gcc	15.71	4.79	155,788	850	93% 67% 78% 94%
C++ g++	32.34	9.25	360,404	892	89% 79% 95% 88%
regex-dna
C gcc	5.76	2.50	292,128	2579	69% 68% 49% 46%
C++ g++	5.83	4.10	173,632	695	0% 60% 82% 0%
reverse-complement
C gcc	0.80	0.56	248,716	741	16% 20% 44% 73%
C++ g++	1.22	0.77	245,692	2275	12% 55% 49% 46%
pidigits
C gcc	1.72	1.73	936	448	0% 0% 1% 100%
C++ g++	2.29	2.30	1,648	682	0% 0% 0% 100%
spectral-norm
C gcc	7.87	1.98	748	569	99% 99% 99% 100%
C++ g++	10.02	2.52	492	1044	100% 100% 100% 100%
n-body
C gcc	9.33	9.34	432	1490	100% 0% 0% 1%
C++ g++	10.07	10.07	828	1763	0% 0% 1% 100%
fasta-redux
C gcc	1.60	1.61	372	1321	0% 0% 99% 1%
C++ g++	1.70	1.71	832	1474	0% 0% 1% 100%
fannkuch-redux
C gcc	48.38	12.42	412	1557	98% 93% 98% 100%
C++ g++	47.95	12.29	1,236	1440	100% 93% 100% 98%
mandelbrot
C gcc	23.52	5.89	25,976	879	100% 100% 100% 100%
C++ g++	19.29	5.01	32,288	726	95% 99% 96% 95%
fasta
C gcc	5.96	5.97	372	1221	0% 0% 0% 100%
C++ g++	4.16	4.16	1,072	1286	0% 0% 100% 0%
k-nucleotide
C gcc	44.64	16.00	180,380	2280	35% 50% 98% 97%
C++ g++	25.89	7.79	155,916	1252	78% 80% 78% 98%

 4 : Are there other C gcc programs for these benchmarks?

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

Ada 2005 GNAT ATS C gcc Clojure C# Mono C++ g++ Dart Erlang 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 gcc programs is fastest on a different OS/machine.

 5 : Are there other faster programs for these benchmarks?

Remember - those are just the fastest C gcc and C++ g++ 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 gcc : unchecked low-level programming 

gcc (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3

Online book: The C Book

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

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

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

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