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zunzun
Joined: 18 Feb 2005
Posts: 167
Location: Birmingham, Alabama USA
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| Posted: Sat Mar 08, 2008 4:51 pm Post subject: CFLAGS for Xenodes? |
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Does anyone have a CFLAGS (SSE2, MMX, etc.) for the Xenodes?
James |
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zunzun
Joined: 18 Feb 2005
Posts: 167
Location: Birmingham, Alabama USA
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| Posted: Sat Mar 22, 2008 3:26 pm Post subject: |
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ATLAS (Automatically Tuned Linear Algebra Subroutines) yielded;
CFLAGS='-fomit-frame-pointer -mfpmath=sse -msse3 -O2 -m32'
James |
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zunzun
Joined: 18 Feb 2005
Posts: 167
Location: Birmingham, Alabama USA
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| Posted: Sun Mar 23, 2008 8:16 am Post subject: |
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zunzun wrote: CFLAGS='-fomit-frame-pointer -mfpmath=sse -msse3 -O2 -m32'
Looks like SSE3 is giving seg faults. Trying:
export CFLAGS='-fomit-frame-pointer -momit-leaf-frame-pointer -mtune=pentium4 -ffast-math --mfpmath=sse -funroll-loops -O2 -m32 -fexpensive-optimizations'
I'm not debugging, so I'm trying -momit-leaf-frame-pointer.
James |
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zunzun
Joined: 18 Feb 2005
Posts: 167
Location: Birmingham, Alabama USA
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| Posted: Sun Mar 23, 2008 9:17 am Post subject: |
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Hmm. It might be that the Xen box has 64-bit processors, but running as 32 bits; trying full ATLAS tune now. This takes a while.
James |
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elw00d
Joined: 25 Apr 2006
Posts: 23
Location: At the helldesk
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| Posted: Sun May 04, 2008 8:13 pm Post subject: |
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zunzun wrote: CFLAGS='-fomit-frame-pointer -momit-leaf-frame-pointer -mtune=pentium4 -ffast-math --mfpmath=sse -funroll-loops -O2 -m32 -fexpensive-optimizations
You probably know what you're doing, but any mention of -ffast-math needs the health warning of RT(F)M before using, unless you don't care about loss of precision in floating point operations.
Having said that it gives some audio software a more natural sound if you have freaky enough hearing to tell the difference. |
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JKWood
Joined: 05 Mar 2008
Posts: 2
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| Posted: Wed May 14, 2008 10:44 am Post subject: |
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| I wasn't aware that I could listen to sound on my linode. You've changed my life! |
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elw00d
Joined: 25 Apr 2006
Posts: 23
Location: At the helldesk
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| Posted: Sun Jun 29, 2008 4:24 am Post subject: |
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| Was the first example I could think of where -ffast-math did something noticeably interesting as opposed to just plan broke something. I don't think I've ever had the need to use my linode for audio processing, I just used to have a gentoo addiction. |
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