[Beowulf] Gentoo in the HPC environment

Jonathan Aquilina jaquilina at eagleeyet.net
Tue Jul 1 09:35:20 PDT 2014

I think my question though is this. can one see negative impacts if the
compiler gets upgraded regardless of if its gcc or intel.

> On 07/01/2014 12:17 AM, Matt Wallis wrote:
>> On 01/07/14 13:45, Jonathan Aquilina wrote:
>>> This question probably sounds like a stupid one, but what difference
>>> in an
>>> HPC environment and to parallel written code does compiler version
>>> make?
>> Depends on the day of the week, the processor, the code, and your
>> cluster really.
>> Sometimes code from GCC is faster, sometimes code from the Intel
>> compiler is faster.
>> Some people write code that only compiles with the Intel compiler, or
>> link against libraries distributed with the compiler.
>> Then of course you might have a BlueGene with PPC cores rather than
>> x86, and while the difference in performance between GCC for PPC and
>> the IBM XL compilers is slight these days, it wasn't always the case.
> One of my researchers has found that his code that is integer-heavy runs
> up to 5x faster on our BG/P when compiled with GCC over the same code
> compiled with the IBM XL compilers. For floating point heavy codes, the
> IBM XL compiles produce much faster code.
>> Intel also distributes highly tuned versions of some maths libraries
>> with their compilers, and libraries designed for offloading work to
>> the the Xeon Phi, without recompiling the application.
>> And then when it comes time to debug why the application doesn't work,
>> commercial compiler suites often come with very good debugging tools.
>> Matt.
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