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Re: [Manta] SSE problem


Chronological Thread 
  • From: "Steven G. Parker" <sparker@cs.utah.edu>
  • To: H.Sri-Narayana@cs.ucl.ac.uk
  • Cc: Solomon Boulos <boulos@cs.utah.edu>, MANTA <manta@sci.utah.edu>
  • Subject: Re: [Manta] SSE problem
  • Date: Mon, 3 Dec 2007 07:20:44 -0700
Were you seeing any warnings from CMake? It looks like some versions of cmake do not like the ELSE() statement without the appropriate marker. I was getting warnings on cmake 2.4. I just committed a file that fixes that, and may fix your problems with sse.

Steve

On Dec 3, 2007, at 5:59 AM, H.Sri-Narayana@cs.ucl.ac.uk wrote:

You guys are right. The -msse and -msse2 are missing in 1892 and are there in 1889. How do I add flags to cmake_cxx_flags ? I can't see that option in ccmake. -Harsha


On Dec 2 2007, Solomon Boulos wrote:

Actually, this is a long standing problem for our linux configs. Most linux distros have gcc versions that enable -msse -msse2 and - msse3 by default. Ubuntu is more sane and doesn't do this. Rolling back to 1889 won't fix the problem, so as Abe suggested add -msse - msse2 and -msse3 to your CMAKE_CXX_FLAGS for now


On Dec 2, 2007, at 12:35 PM, Abe Stephens wrote:

On Dec 2, 2007, at 6:29 AM, H.Sri-Narayana@cs.ucl.ac.uk wrote:

If I try and compile r1891 I am told the 'SSE instruction set is not enabled.' The full error log is attached. I disabled GCC_SSE and SSE from the ccmake options and build/bin/manta runs ok, although I get a big performance hit. However if I compile r1889 then I can have the SSE flags on.

It looks like there were some major changes to the SSE logic for supporting non-unix systems which don't have the same set of common tools.

Try running "make VERBOSE=1": you should see the SSE command line options when MANTA_SSE is enabled:

[  1%] Building CXX object CMakeFiles/About.dir/src/About.o
/usr/bin/c++ -Wall -Wno-strict-aliasing -DSCI_NOPERSISTENT - march=nocona -mtune=nocona -msse -msse2 -msse3 -mfpmath=sse - O3 - DNDEBUG -g3 -fgcse-sm -funroll-loops -fstrict-aliasing - fsched- interblock -ffast-math -freorder-blocks -I/Users/abe/ Manta -I/Users/ abe/Manta/build-leopard/include -I/usr/X11R6/ include -fPIC -o CMakeFiles/About.dir/src/About.o -c /Users/ abe/Manta/build-leopard/ src/About.cc


If they aren't there, you can add them to CMAKE_CXX_FLAGS manually. Alternatively roll back to 1889.

(Subquestion: How do I easily diff 2 svn versions from terminal? Should I checkout each version separately and then use diff? Or is there some nice in built svn way?)

Try: svn diff -r 1889:HEAD CMake/CheckSSE.cmake from the trunk's root directory.

Abe



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