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Re: [MANTA] unaligned access problem on fisher


Chronological Thread 
  • From: James Bigler <bigler@cs.utah.edu>
  • Cc: manta@sci.utah.edu
  • Subject: Re: [MANTA] unaligned access problem on fisher
  • Date: Sun, 15 May 2005 12:41:42 -0600
Ok, not much we can do about openGL. Incidently, I don't get those messages when I connect to fisher from my home computer...

Different X server, perhaps?

There is another software trap I noticed though. If you run manta and then look in dmesg, you'll see it's getting:
manta(13450): floating-point assist fault at ip 4000000000018181, isr 0000020000000008
errors on fisher.

I tried passing -ftz when compilling, but I still get these messages which means either I did something wrong, it's not denormalized numbers, or it's in some outside library. Any idea on these? I read that each software trap costs abouts 1000 instr...

I haven't seen this one before.  Can you reproduce it?

James

James Bigler wrote:

This happens with OpenGL. It doesn't affect anything that I can tell in using the port for over 2 years. Just disregard it.

James

Thiago Ize wrote:

When I run manta on fisher I get the following message: manta(11958): unaligned access to 0x200000000155c05c, ip=0x200000000097f0f0
I'm guessing this is causing a performance hit...

I have ccmake using ipcp and icc to compile the code, but aside from that I believe I'm using the default settings for everything else. Any ideas why this might be happening?

Thiago







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