Date: Wed, 25 May 2005 13:17:15 -0400 From: Nicolas Blais <nb_root@videotron.ca> To: freebsd-amd64@freebsd.org Subject: amd64 optimized gcc? Message-ID: <200505251317.22128.nb_root@videotron.ca>
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I am developping a software that follows a random()-dependant algorithm whi=
ch=20
is extremely cpu intensif.=20
I decided to run on different platforms to see how it performed based on cp=
u=20
and os (in a way of benchmarking) and I'm surprised by the numbers:
Reference times for benchmark (5e+07 run of the algorithm):
(FreeBSD/i386) Venice (S939, 512K L2 cache) Athlon64 3000 overclocked @ 26=
55=20
Mhz : 78.3072 s (638511 r/s)
Note: Cool 'n' Quiet! Disabled in BIOS.
Note: 1 G RAM
(FreeBSD/amd64) Venice (S939, 512K L2 cache) Athlon64 3000 overclocked @ 2=
655=20
Mhz : 71.2521 s (701732 r/s)
Note: Cool 'n' Quiet! Disabled in BIOS.
Note: 1 G RAM
(Knoppix/i386) Clawhammer (S747, 1MB L2 cache) Athlon64 3200 @ 2000 Mhz :=
=20
133.858 s (373325 r/s)
Note: Compaq R3240CA Laptop, Cool 'n' Quiet! forced by BIOS.
Note: 512 M RAM
(FreeBSD/amd64) Clawhammer (S747, 1MB L2 cache) Athlon64 3200 @ 2000 Mhz :=
=20
47.2754 s (1057630 r/s)
Note: Compaq R3240CA Laptop, Cool 'n' Quiet! forced by BIOS.
sysctl hw.acpi.cpu.px_control=3D-1
Note: 512 M RAM
(FreeBSD/i386) Pentium II @ 233 Mhz : 538.136 s (92913.3 r/s)
Note: 192 M RAM
Not surprising is the Pentium II :). What is surprising is that amd64 Free=
BSD=20
seems to execute code faster than i386 FreeBSD, so I'm wondering if gcc=20
(amd64) really optimizes code for the cpu. If it is, I would probably move =
my=20
httpd server to amd64...
Also, maybe less surprising is that Knoppix sucks running the algorithm for=
=20
some reason and that L2 cache really is a big factor (my Laptop outperforms=
=20
my heavily overclocked box).
Any comments?
=2D-=20
=46reeBSD 6.0-CURRENT #2: Sun May 22 11:29:47 EDT 2005 =20
nicblais@clk01a:/usr/obj/usr/src/sys/CLK01A=20
PGP? : http://66.130.198.54:8081/security/nb_root.asc
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