[gmx-developers] thread problem on AMD 12 core chips?

[David van der Spoel]

On 2012-01-12 11:17, Berk Hess wrote:
> Which compiler is this?
> We get lots of warnings with gcc4.6, but we run regularly on 32 and 64
> core nodes.

Thread model: posix
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)

Is intel more reliable?
>
> Berk
>
> On 01/12/2012 11:04 AM, David van der Spoel wrote:
>> Hi,
>>
>> I'm trying to compile and install gromacs release-4-5-patches on a new
>> cluster with four 12-core AMD chips (abisko in Umea, Sweden). However
>> the threaded code bails out with the following message:
>>
>> Reading file topol.tpr, VERSION 4.5.5-dev-20120111-9181e (double
>> precision)
>> Starting 32 threads
>> tMPI error: tMPI Initialization error (in valid comm)
>>
>> First, I'm a bit confused why the code detects only 32 cores, second
>> it shows above error and quits.
>>
>> Any clues?
>


-- 
David van der Spoel, Ph.D., Professor of Biology
Dept. of Cell & Molec. Biol., Uppsala University.
Box 596, 75124 Uppsala, Sweden. Phone:	+46184714205.
spoel at xray.bmc.uu.se    http://folding.bmc.uu.se