C GNU gcc speed ÷ C++ GNU g++ speed | Computer Language Benchmarks Game

Step 1 : Are the C GNU gcc programs faster? At a glance.

This chart shows 3 comparisons - Time-used, Memory-used and Code-used ~ speed and size.

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

Look at speed another way - look at a box plot of Time-used data.

Step 2 : Are the C GNU gcc programs faster? Approximately.

This table shows 3 comparisons - Time-used, Memory-used and Code-used ~ speed and size.

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

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

C GNU gcc used what fraction? used how many times more?
Time-used	\|-	\|---	25%	median	75%	---\|	-\|
(Elapsed secs)	¹/₃	¹/₂	±	±	±	±	3×

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

Step 3 : Are the C GNU gcc programs faster? Measurements.

This table shows 5 measurements - CPU Time, Elapsed Time, Memory, Code and ≈ CPU Load ~ speed and size.

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

Program Source Code	CPU secs	Elapsed secs	Memory KB	Code B	≈ CPU Load
regex-dna
C GNU gcc	5.82	5.83	286,796	2579	0% 0% 0% 100%
C++ GNU g++	17.01	17.01	94,660	1759	0% 0% 0% 100%
fasta-redux
C GNU gcc	1.68	1.69	256	1321	1% 1% 1% 100%
C++ GNU g++	2.93	2.94	580	1474	1% 1% 0% 100%
fasta
C GNU gcc	4.92	4.92	256	1221	0% 0% 0% 100%
C++ GNU g++	6.31	6.31	256	1266	1% 0% 0% 100%
binary-trees
C GNU gcc	12.14	12.15	99,412	850	0% 0% 0% 100%
C++ GNU g++	12.93	12.95	148,448	892	0% 1% 1% 100%
fannkuch-redux
C GNU gcc	45.26	45.27	252	567	0% 0% 0% 100%
C++ GNU g++	47.85	47.86	952	1440	0% 0% 0% 100%
mandelbrot
C GNU gcc	23.31	23.32	29,888	799	0% 0% 0% 100%
C++ GNU g++	23.72	23.73	32,060	1017	0% 0% 0% 100%
reverse-complement
C GNU gcc	1.07	1.08	496,900	1867	1% 1% 1% 100%
C++ GNU g++	1.07	1.09	245,348	2275	3% 2% 2% 100%
pidigits
C GNU gcc	2.74	2.74	1,092	541	0% 1% 0% 100%
C++ GNU g++	2.74	2.74	1,680	682	0% 1% 0% 100%
n-body
C GNU gcc	20.45	20.46	284	1173	0% 0% 0% 100%
C++ GNU g++	20.11	20.12	284	1659	0% 0% 0% 100%
spectral-norm
C GNU gcc	10.22	10.23	608	1139	0% 0% 0% 100%
C++ GNU g++	10.00	10.01	608	1044	0% 0% 1% 100%
k-nucleotide
C GNU gcc	38.44	38.46	153,528	2280	0% 0% 0% 100%
C++ GNU g++	11.86	11.88	133,472	3415	0% 0% 0% 100%

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

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

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

Step 5 : Are there other faster programs for these benchmarks?

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

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

C GNU gcc : unchecked low-level programming

gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)

Online book: The C Book

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

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

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