On Mon, Feb 16, 2009 at 3:33 PM, Kirk, Benjamin (JSC-EG) <[email protected]> wrote: > >>> Wait, there's a bug in icc? I didn't realize we were getting bad >>> output from vsmoother; I just assumed that you'd turned off vsmoother >>> optimization because it was excruciatingly slow. ;-) >> >> I'm interested in knowing as well. I saw that note the other day and >> just figured that there was actually a subtle bug in vsmoother >> somewhere that was exposed with higher optimization levels. >> >> Ben: Do you know that it's actually a bug in icc? > > I recollect seeing this with other codes too, which suggests it is an > optimization bug in icc. I've explicitly included John since I bet they > have seen this at TACC as well.
Yes, although it has mostly been in the context of multi-thousand-line Fortran files where we see Intel choke and/or optimize forever. Of course, at that level the language itself has probably all been converted to some intermediate compiler language and so C vs. Fortran distinction is irrelevant. > John put the --disable-vsmoother in there to work around icc with I did? :-) I think Derek may have been working on getting Larisa's code ported, so I was just making it a little easier for him to keep developing without bothering anyone else's compiles. > optimization, but I use icc so infrequently I was always forgetting the > option. Invariably, I'd run ./configure ; make and then get sidetracked - > coming back much later and icc would still be churning on that file. So I > put in the compiler pragma. Seems like a reasonable work-around... In a compiler release or two we can try again with full optimization. -- John ------------------------------------------------------------------------------ Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise -Strategies to boost innovation and cut costs with open source participation -Receive a $600 discount off the registration fee with the source code: SFAD http://p.sf.net/sfu/XcvMzF8H _______________________________________________ Libmesh-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-devel
