gcc vs clang


.	MySQL 5.5.25	8 Cores CPU: Intel(R) Xeon(R) CPU L5310 @ 1.60GHz (1596.07-MHz K8-class CPU) avail memory = 4090195968 (3900 MB)
.	sysbench --test=oltp --db-driver=mysql --mysql-table-engine=innodb --mysql-socket=/tmp/mysql.sock --mysql-user=root --max-requests=0 --max-time=120 --num-threads=$i run
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.	head/r237134	Threads 1	Threads 4	Threads 8	Threads 16	Threads 32	Threads 40	Threads 64	Threads 128
.	Run 1	453.83	1642.75	3136.01	3039.13
.	Run 2	461.27	1641.53	3125.36	3043.71
.	Run 3	467.04	1641.36	3135.89	3047.79
.	Run 4	474.76	1641.25	3135.13	3040.5
.	Run 5	473.43	1643.84	3127.21	3043.77
.	Run 6	470.49	1640.32	3136.08	3041.85
.	Run 7	476.5	1640.55	3128.48	3044.02
.	Run 8	474.89	1641.41	3140.67	3041.52
.	head/r237134	469.02625	1641.62625	3133.10375	3042.78625	0	0	0	0
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.	head/r237134 world+kernel compiled with clang	Threads 1	Threads 4	Threads 8	Threads 16	Threads 32	Threads 40	Threads 64	Threads 128
.	Run 1	453.52	1641.74	3098.76	3011.36
.	Run 2	451.97	1633.99	3097.42	3007.1
.	Run 3	452.27	1635.67	3106.68	3012.61
.	Run 4	455.04	1633.53	3100.23	3013.49
.	Run 5	454.04	1635.42	3097.72	3016.38
.	Run 6	452.71	1639.21	3100.38	3010.85
.	Run 7	454.25	1636.2	3105.95	3014.49
.	Run 8	452.01	1637.06	3105.09	3011.96
.	head/r237134 world+kernel compiled with clang	453.22625	1636.6025	3101.52875	3012.28	0	0	0	0
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.	head/r237134 world+kernel+mysql compiled with clang	Threads 1	Threads 4	Threads 8	Threads 16	Threads 32	Threads 40	Threads 64	Threads 128
.	Run 1	456.68	1624.45	3072.93	2982.97
.	Run 2	451.61	1624.53	3072.82	2993.55
.	Run 3	463.09	1619.62	3075.13	2990.3
.	Run 4	464.59	1620.75	3072.07	2991.19
.	Run 5	453.09	1623.49	3069.4	2993.46
.	Run 6	454.47	1621.05	3066.25	2989.7
.	Run 7	465.24	1622.02	3074.49	2991.72
.	Run 8	465.68	1621.78	3069.02	2991.08
.	head/r237134 world+kernel+mysql compiled with clang	459.30625	1622.21125	3071.51375	2990.49625	0	0	0	0