Rust versus C gcc

How the programs are written matters! Always look at the source code.

If the fastest programs are flagged * possible hand-written vector instructions or "unsafe" or naked ffi, does the host language matter? You might be more interested in the less optimised programs — more seconds, less gz source code.

fannkuch-redux
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C gcc #6	2.14	8.44	2,712	1582	2.68
* C gcc #4	14.05	14.06	2,351	1190	2.31
* Rust #6	3.81	15.06	3,985	1260	11.92
Rust #4	6.94	27.12	3,985	1026	11.71
C gcc #5	7.28	28.32—28.45	2,949	917	2.17
Rust #5	7.41	28.89	3,990	1023	11.79
Rust #2	9.19	36.04—36.08	3,723	1198	11.14
C gcc #3	36.84	36.84—36.89	2,343	574	2.19
C gcc #8	39.34	39.52—40.22	2,343	483	2.20
C gcc	39.65	39.64—40.07	2,343	514	2.12
* C gcc #2	10.18	39.98—40.15	2,695	1563	2.51
n-body
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C gcc #9	2.10	2.10	2,482	1639	2.99
* Rust #9	2.19	1.90—3.09	3,023	1881	11.01
* Rust #7	3.24	3.24	2,937	1759	10.53
Rust #3	3.46	3.46	2,937	1774	10.62
Rust #2	3.65	3.65	3,031	1809	10.49
* C gcc #4	4.06	4.06	2,499	1398	2.98
* Rust #6	4.37	4.36—4.49	3,031	1796	10.86
C gcc #6	4.98	4.99	2,482	1186	2.33
* Rust #5	5.02	5.03	3,035	2224	10.61
Rust #4	5.13	4.99—5.53	3,039	1810	10.50
C gcc #2	5.20	5.20	2,490	1270	2.43
C gcc	5.23	5.23	2,486	1179	2.58
C gcc #3	5.24	5.24	2,482	1214	2.42
* C gcc #5	5.44	5.44	2,494	1436	2.31
Rust	5.52	5.50—5.60	3,027	1483	10.84
C gcc #8	5.54	5.54	2,486	1195	2.52
C gcc #7	6.89	6.90	2,490	1250	2.32
spectral-norm
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C gcc #6	0.40	1.60	3,199	1203	3.38
* C gcc #5	0.72	2.86	3,858	576	2.52
* Rust #6	0.72	2.85	3,981	1132	12.60
Rust #4	0.72	2.85	4,047	823	12.00
* C gcc #7	0.72	2.86	4,067	906	3.21
* Rust #5	0.72	2.86	4,018	1062	11.30
* C gcc #4	0.72	2.86	3,719	1145	2.49
* Rust #2	0.72	2.86	4,145	1117	11.00
* Rust	0.72	2.86	4,104	1262	11.75
* Rust #3	0.74	2.94	4,121	1060	10.92
C gcc #8	5.41	5.41	3,219	389	2.42
C gcc #3	1.43	5.71	4,080	470	2.42
* Rust #7		Empty
* C gcc #2		Empty
mandelbrot
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* Rust #4	0.95	3.78	35,598	1301	12.26
* Rust #6	1.08	4.21	36,426	1338	12.65
Rust #7	1.10	4.34	35,906	763	12.32
Rust #2	1.10	4.36—4.52	35,754	770	12.80
Rust #5	1.12	4.38	36,311	725	12.27
Rust #3	1.15	4.57	14,615	1013	12.66
* C gcc #6	1.29	5.11	35,578	1147	2.64
C gcc #5	1.64	6.32	35,582	788	2.38
Rust	2.01	7.90	42,631	874	10.94
* C gcc #4	3.50	13.91	35,197	805	2.16
* C gcc #7	3.51	13.94	35,447	1000	2.60
* C gcc	3.50	13.94	35,017	828	2.23
* C gcc #3	3.55	14.12	34,873	769	2.26
C gcc #9	4.07	15.72	35,394	700	2.47
C gcc #8	25.17	25.18	2,355	412	2.29
fasta
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
C gcc #3	0.79	0.79	2,236	1469	2.26
C gcc #5	1.24	1.25	2,154	1286	2.42
* Rust #7	0.78	1.55	4,772	2533	11.68
Rust #3	2.03	2.03	3,199	1235	10.95
C gcc #2	2.77	2.77	2,204	1299	2.25
C gcc #6	0.95	2.77—2.81	3,748	1936	2.44
Rust #9	0.94	3.20—3.33	5,534	1952	11.24
C gcc #7	0.83	3.28	4,514	2276	2.39
Rust #2	0.95	3.46—3.50	5,554	1910	11.45
Rust #5	0.94	3.48—3.53	5,554	1963	12.19
Rust #4	3.52	3.53	128,217	944	10.63
Rust #6	3.53	3.53	128,381	959	10.62
C gcc	3.71	3.71	2,421	1213	2.25
Rust	4.45	4.54—4.61	3,113	1240	11.09
C gcc #8	8.27	8.31—8.37	2,195	839	2.20
C gcc #4		Empty
k-nucleotide
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Rust #7	2.57	8.13—8.39	139,088	1585	13.43
Rust #3	3.28	9.72—10.13	142,631	1549	11.91
Rust #6	2.79	10.06—10.15	165,048	1697	14.10
Rust #5	3.88	11.66—11.92	143,155	1745	12.40
C gcc	3.58	12.06—12.40	135,234	1512	2.82
Rust #2	6.00	15.71—16.24	142,946	1350	11.85
Rust #9	6.33	17.72—18.82	141,099	1850	14.41
Rust #4	6.69	18.00—18.74	142,090	1755	13.13
Rust	21.08	64.42—65.12	161,219	1086	12.16
reverse-complement
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
* C gcc #7	0.44	0.62	514,208	1899	3.13
C gcc #9	0.49	0.78	514,159	1551	2.20
* Rust	0.55	0.85	512,963	2762	11.72
C gcc #6	0.97	1.37	693,969	828	2.26
C gcc #5	1.54	1.54	1,020,662	654	2.05
C gcc #2	1.07	1.59	1,021,755	757	2.15
Rust #2	1.01	1.61	1,022,128	1332	11.04
Rust #3	1.02	1.72	1,022,034	1105	11.45
* C gcc #4	3.70	3.71	514,077	716	2.22
binary-trees [ Contentious. Different approaches. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Rust #5	1.07	3.84—4.01	139,121	771	1.28
Rust #2	1.17	4.16—4.25	140,157	729	12.50
C gcc #2	1.56	4.30—4.45	174,780	816	3.21
C gcc #3	1.96	4.79—4.93	138,711	842	2.94
Rust #4	1.38	4.98—5.02	202,686	765	12.32
Rust #3	1.40	5.15—5.26	172,392	762	11.90
Rust	2.10	7.44	137,417	760	11.36
C gcc	21.21	21.39—21.70	272,065	660	2.37
C gcc #5	8.71	31.85—32.27	361,587	914	2.34
pidigits [ Contentious. Different libraries. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Rust #4	0.71	0.72	4,055	804	11.82
C gcc #2	0.74	0.74	4,006	422	2.25
* Rust #2	0.75	0.75	4,387	1312	10.44
* Rust	0.75	0.75	4,243	1426	10.19
C gcc	0.75	0.75	3,727	459	2.30
* Rust #3	0.75	0.75	4,510	1373	10.10
regex-redux [ Contentious. Different libraries. ]
	elapsed	Mean or 95% CI
source	secs	cpu secs	mem	gz	make
Rust #6	1.21	1.46	159,846	994	13.12
Rust #5	1.35	1.58	209,863	777	12.67
Rust	1.35	1.59—1.63	159,793	811	12.22
Rust #3	1.38	1.63	210,379	726	13.51
Rust #4	1.38	1.64	206,811	771	12.41
Rust #2	1.38	1.64	159,937	707	11.67
* Rust #7	0.78	2.00	157,442	2464	12.48
C gcc #5	0.81	2.05	157,463	1403	2.47
C gcc #2	3.22	3.22	106,713	1121	2.14
C gcc #4	0.97	3.30	157,417	1237	2.18
C gcc #3	1.73	3.32	107,401	1273	2.27
Rust	1.84.1 (e71f9a9a9 2025-01-27) LLVM version: 19.1.5
C gcc	gcc (Ubuntu 14.2.0-4ubuntu2) 14.2.0