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	4×	±
binary-trees	±	¹/₂	±
fasta-redux	±	¹/₃	±
fasta	±	±	±
mandelbrot	±	±	±
fannkuch-redux	±	¹/₃	±
pidigits	±	¹/₂	±
reverse-complement	±	2×	±
spectral-norm	±	±	±
n-body	±	±	±
k-nucleotide	4×	±	±

C GNU gcc used what fraction? used how many times more?
Time-used	\|-	\|---	25%	median	75%	---\|	-\|
(Elapsed secs)	¹/₃	¹/₂	±	±	±	±	4×

± 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	5.37	5.38	326,032	2579	1% 1% 5% 100%
C++ GNU g++	15.65	15.66	91,144	1759	0% 0% 0% 100%
binary-trees
C GNU gcc	11.97	11.98	149,144	850	0% 0% 0% 100%
C++ GNU g++	16.09	16.15	296,228	892	0% 0% 0% 100%
fasta-redux
C GNU gcc	1.68	1.68	328	1321	0% 1% 0% 100%
C++ GNU g++	2.00	2.00	1,004	1474	0% 1% 0% 100%
fasta
C GNU gcc	5.84	5.85	328	1221	0% 0% 0% 100%
C++ GNU g++	6.19	6.20	328	1266	0% 0% 0% 100%
mandelbrot
C GNU gcc	23.46	23.47	30,232	799	0% 0% 0% 100%
C++ GNU g++	24.29	24.29	32,228	1017	0% 0% 0% 100%
fannkuch-redux
C GNU gcc	49.50	49.52	368	1557	0% 0% 0% 100%
C++ GNU g++	50.36	50.37	1,164	1440	0% 0% 0% 100%
pidigits
C GNU gcc	2.29	2.29	896	541	0% 0% 0% 100%
C++ GNU g++	2.29	2.29	1,580	682	0% 0% 0% 100%
reverse-complement
C GNU gcc	0.90	0.92	480,332	1867	0% 1% 0% 99%
C++ GNU g++	0.88	0.89	224,672	2275	4% 1% 1% 98%
spectral-norm
C GNU gcc	10.63	10.64	688	1139	0% 0% 0% 100%
C++ GNU g++	10.00	10.00	688	1044	1% 0% 0% 100%
n-body
C GNU gcc	20.72	20.72	328	1429	0% 0% 0% 100%
C++ GNU g++	19.35	19.35	352	1659	0% 0% 0% 100%
k-nucleotide
C GNU gcc	40.30	40.32	180,308	2280	0% 0% 0% 100%
C++ GNU g++	9.91	9.93	142,084	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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