Compilation performance comparison of GCC 3.4.2 and GCC 4.0.0 (041024)on MICO sources

[Karel Gardas <kgardas at objectsecurity dot com>]

Hello,

it seems a lot happened from my last test:
http://gcc.gnu.org/ml/gcc/2004-08/msg01594.html

Below you will find recent test results. Some notes about them are:

1) -O0 is _GREAT_! It's about 25% speedup in comparison with 3.4.2. The
   only issue is with ir.cc file where we have 32% regression. The
   problem is probably with very high memory usage (4.0.0 consumes about
   250MB of RAM on my 512MB box when compiling this file)

2) -O1 is about 5% slower, some interesting regressions are
   typecode.cc(23%), static.cc(29%) and again ir.cc (44%)

3) -O2 is also about 4% slower, regressions (the most
   important/interesting) are: static.cc(32%) and ir.cc(39%). Interesting
   is 41% speedup on typecode here while it regress badly on -O1

As a first possible step, I would like to propose solving ir.cc
regressions, since if you do it, even -O1/-O2 compilation will be faster
in comparison with 3.4.2 (ir.cc is 580kB long generated file)

Generally, it looks really promissing, and I will need to test how does it
work with -O0 -g to see if it is well replacement for my current 3.4.2.

Thanks to you all folks for this great work!

Karel
--
Karel Gardas                  kgardas@objectsecurity.com
ObjectSecurity Ltd.           http://www.objectsecurity.com


File		342-O0	400-O0	Delta%	342-O1	400-O1	Delta%	342-O2	400-O2	Delta%

os-unix.cc	4.17	3.3	26.36	4.61	3.85	19.74	4.62	4.19	10.26
dii.cc		12.36	8.69	42.23	14.06	14.67	-4.16	16.8	18.28	-8.1
typecode.cc	9.09	7.65	18.82	13.53	17.73	-23.69	32.95	23.29	41.48
any.cc		6.88	5.59	23.08	9.41	11.31	-16.8	13.38	15.07	-11.21
codec.cc	5.92	4.7	25.96	7.76	8.37	-7.29	9.56	10.99	-13.01
buffer.cc	3.32	2.67	24.34	3.59	3.01	19.27	3.72	3.3	12.73
context.cc	3.61	2.93	23.21	3.91	3.59	8.91	4.24	4	6
except.cc	4.46	3.49	27.79	5.05	4.36	15.83	6.22	5.7	9.12
dispatch.cc	4.51	3.59	25.63	4.92	4.36	12.84	4.97	4.94	0.61
string.cc	3.41	2.64	29.17	3.52	2.91	20.96	3.44	2.97	15.82
object.cc	4.71	3.92	20.15	6.02	6	0.33	7.2	7.01	2.71
address.cc	5.3	4.01	32.17	6.54	5.01	30.54	7.39	5.73	28.97
ior.cc		12.12	8.16	48.53	14.63	11.48	27.44	16.83	13.22	27.31
orb.cc		16.51	12.03	37.24	25.68	27.55	-6.79	37.77	35.24	7.18
boa.cc		8.73	6.84	27.63	11.94	12.49	-4.4	14.55	15.87	-8.32
dsi.cc		9.91	6.91	43.42	11.53	9.62	19.85	12.41	11.07	12.1
transport.cc	4.09	3.19	28.21	4.44	3.57	24.37	4.6	3.84	19.79
t..port/tcp.cc	4.11	3.12	31.73	4.37	3.68	18.75	4.45	4.06	9.61
t..port/udp.cc	4.19	3.21	30.53	4.5	3.85	16.88	4.77	4.28	11.45
t..port/unix.cc	4.06	3.14	29.3	4.41	3.68	19.84	4.42	3.98	11.06
iop.cc		16.03	11.93	34.37	22.13	24.26	-8.78	29.44	32.63	-9.78
util.cc		6	4.72	27.12	8.02	7.9	1.52	10.29	9.63	6.85
basic_seq.cc	3.84	3.22	19.25	4	3.9	2.56	3.9	4.4	-11.36
fast_array.cc	3.92	2.96	32.43	4.04	3.09	30.74	3.92	3.17	23.66
ssl.cc		8.95	5.79	54.58	9.12	5.81	56.97	8.67	5.75	50.78
fixed.cc	3.75	3.12	20.19	4.16	3.83	8.62	4.31	4.33	-0.46
intercept.cc	9.86	7.09	39.07	11.44	9.79	16.85	12.15	11.27	7.81
codeset.cc	5.95	4.66	27.68	7.47	7.99	-6.51	10.16	10.6	-4.15
queue.cc	4.4	3.49	26.07	4.73	3.87	22.22	4.8	4.15	15.66
static.cc	19.93	15.63	27.51	24.6	34.77	-29.25	29.24	43.49	-32.77
current.cc	8.54	5.52	54.71	8.64	5.61	54.01	8.39	5.63	49.02
policy_impl.cc	12.37	8.55	44.68	13.68	12.64	8.23	15.35	14.54	5.57
service_info.cc	8.53	5.49	55.37	8.58	5.63	52.4	8.26	5.49	50.46
ioptypes.cc	10.32	7.32	40.98	12.44	9.92	25.4	13.51	11.24	20.2
ssliop.cc	8.7	5.7	52.63	8.91	5.78	54.15	8.54	5.65	51.15
value.cc	10.93	7.04	55.26	11.8	8.86	33.18	12.39	10	23.9
valuetype.cc	9.51	6.6	44.09	10.34	8.43	22.66	10.99	9.34	17.67
v..type_impl.cc	12.13	8.79	38	12.81	12.71	0.79	13.6	14.88	-8.6
dynany_impl.cc	10.71	9.22	16.16	16.2	20.41	-20.63	24.22	26.63	-9.05
policy2.cc	8.84	5.64	56.74	8.95	5.91	51.44	8.79	6.02	46.01
tckind.cc	8.54	5.51	54.99	8.56	5.55	54.23	8.28	5.46	51.65
orb_excepts.cc	8.63	5.63	53.29	8.85	5.8	52.59	8.62	5.88	46.6
policy.cc	8.61	5.55	55.14	8.83	5.77	53.03	8.59	5.77	48.87
poa.cc		12.62	8.87	42.28	15.02	14.6	2.88	17.66	17.77	-0.62
poa_base.cc	9.85	7.06	39.52	10.63	8.51	24.91	11.47	9.46	21.25
poa_impl.cc	17.24	12.92	33.44	22.86	25.66	-10.91	30.02	32.66	-8.08
dynany.cc	9.91	6.82	45.31	10.7	8.94	19.69	11.63	9.8	18.67
uni_base64.cc	0.12	0.12	0	0.18	0.21	-14.29	0.26	0.28	-7.14
uni_unicode.cc	0.2	0.19	5.26	0.29	0.34	-14.71	0.44	0.5	-12
uni_fromuni.cc	0.4	0.38	5.26	0.61	0.79	-22.78	1.13	1.21	-6.61
uni_touni.cc	0.44	0.42	4.76	0.71	0.92	-22.83	1.26	1.33	-5.26
except2.cc	6.69	5.58	19.89	10.41	12.83	-18.86	13.32	16.4	-18.78
pi.cc		11.11	7.49	48.33	12.51	10.73	16.59	13.29	12.44	6.83
pi_impl.cc	18.77	14.2	32.18	23.55	24.99	-5.76	30.82	30.39	1.41
typecode_seq.cc	8.88	5.93	49.75	9.31	6.96	33.76	9.18	7.5	22.4
timebase.cc	8.56	5.5	55.64	8.78	5.7	54.04	8.5	5.68	49.65
ir.cc		47.17	69.26	-31.89	72.42	129.49	-44.07	100.1	165.27	-39.43
ir_base.cc	11.59	8.1	43.09	13.29	13.97	-4.87	15.63	16.7	-6.41
imr.cc		14.37	11.49	25.07	18.38	21.12	-12.97	25.2	26.53	-5.01
mtdebug.cc	3.82	2.94	29.93	3.9	3.05	27.87	3.78	3	26

Sum		522.19	416.22	25.46	636.27	668.13	-4.77	774.39	809.9	-4.38