[CP2K:983] Re: intel v10.1 compilers
liangy... at gmail.com
Fri Apr 25 07:26:58 UTC 2008
To me, cp2k works with intel v 9.1 in opteron.
On Fri, Apr 25, 2008 at 12:55 AM, ilya <ily... at gmail.com> wrote:
> Hi !!!
> I remember that when I tried to compile the whole cp2k with intel 9.1
> on opteron I've got a lot of strange problems with seg faults etc.
> Upgrading to 10.1 allowed me to successfully compile the thing.
> In both cases of course I turned off Intel specific optimizations (no -
> xSomething key; -O2).
> It's interesting whether intel provides some sort of 'official'
> support for nonintel x86 and x86_64 cpus
> (and for intel cpus too :-) ).
> I also know that they replaced vectorization module in intel 10.1
> (compared to 9.1). And in some cases this new vectorizer generates
> code that runs several times slower (i've made a simple synthetic test
> -- mandelbrot fractal generator). Some people on their developer forum
> also reported such performance problems on new compilers.
> Of course for real-problem code I think there is no such degradation.
> But anyway...
> So it's interesting what are they doing there in intel???
> PS To tell the truth, their performance suites are rather handy and
> FREE for linux. So it's very unpleasant to see such problems.
> On Apr 24, 8:58 pm, Axel <akoh... at gmail.com> wrote:
> > hi everybody,
> > it may perhaps of interest to several people here, that after
> > extensive
> > testing, i have to come to the conclusion that the current intel
> > v10.1
> > compilers invariably miscompile some modules of cp2k on all platforms
> > (but different ones on each) and regardless of the optimization level
> > and
> > patchlevel of the compiler. most problems show only up when running
> > in parallel.
> > in all the problematic cases, using a g95 or intel v9.1
> > compiled executable (with -O2 optimization only) was
> > fixing the problems.
> > cheers,
> > axel.
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