[mpich-discuss] IMB fails with tcp/ip 512 processes.

[Devesh Sharma]

On Wed, Jun 3, 2009 at 6:22 PM, Guillaume Mercier <mercierg at mcs.anl.gov> wrote:
>
> Devesh,
>
> I don't remember exactly if ssm stands for "scalable shared memory" or
> "sockets + shared memory".
yes its sockets+shared memory and it uses UD sockets AFAIK.
> As for Nemesis, it supports shared memory and sockets (throught TCP) but
> also Myrinet, etc.
> It's the default communication channel in MPICH2 1.1
> I'm not sure about the current ssm support in MPICH2 so maybe you should
> give Nemesis a try.
Ok I will surly give it a try.
>
> Guillaume
>
> Devesh Sharma a écrit :
>>
>> thanks Guillaume,
>> Kindly clarify the difference between nemesis and ssm devices. I am
>> sorry if it sounds silly.
>>
>> On Wed, Jun 3, 2009 at 6:09 PM, Guillaume Mercier <mercierg at mcs.anl.gov>
>> wrote:
>>
>>>
>>> Hello,
>>>
>>> The MPICH2/Nemesis TCP module uses TCP as protocol, not UDP.
>>> You can configure it with the option  --with-device:nemesis:tcp
>>> The TCP module is the default communication network in Nemesis.
>>>
>>> Regards,
>>> Guillaume
>>>
>>>
>>> Devesh Sharma a écrit :
>>>
>>>>
>>>> thanks sir,
>>>>
>>>> I will try out this.
>>>> Dose new TCP/IP mpi stack still uses UD socket fot data transfer? If
>>>> yes them what is the difficulty to use TCP socket?
>>>>
>>>> On Wed, Jun 3, 2009 at 5:18 PM, Dhabaleswar Panda
>>>> <panda at cse.ohio-state.edu> wrote:
>>>>
>>>>
>>>>>
>>>>> If you are interested in the TCP/IP interface, you should use the
>>>>> latest
>>>>> MPICH2 stack (not MVAPICH2 stack). FYI, the TCP/IP interface support in
>>>>> MVAPICH2-1.2 is similar to that in MPICH2 1.0.7. We released MVAPICH2
>>>>> 1.4
>>>>> yesterday and it has the TCP/IP support of MPICH2 1.0.8p1.  The latest
>>>>> version of MPICH2 stack is the 1.1 series. You should use this version
>>>>> to
>>>>> get the best performance and stability.
>>>>>
>>>>> Hope this helps.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> DK
>>>>>
>>>>> On Wed, 3 Jun 2009, Devesh Sharma wrote:
>>>>>
>>>>>
>>>>>
>>>>>>
>>>>>> Hello list
>>>>>>
>>>>>> I am trying to run IMB using ssm ADI of MVAPICH2-1.2 on 32 quad socket
>>>>>> quad core machines. But it is failing because segfault when I run with
>>>>>> 512 processes.
>>>>>> Somebody kindly help me to figure out where the problem is.
>>>>>>
>>>>>> -Devesh
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>
>>>
>
>