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

[Berk Hess]

On 01/12/2012 11:24 AM, David van der Spoel wrote:
> 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?
This is not a matter of platform I would think.
We have only used AMD platform with 32 or more MPI threads.
I would guess this is a thread-mpi bug or a compiler issue.

Berk
>>
>> 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?
>>
>
>