[mvapich-discuss] VIADEV_CLUSTER_SIZE

[Mark Potts]

Matt,
    Thanks.
    Explicitly, does your description mean that for ch_gen2 MVAPICH
    the default value of VIADEV_VBUF_TOTAL_SIZE is automataically
    adjusted based on job size w/o need for VIADEV_CLUSTER_SIZE
    setting as currently described in the User Guide?
           regards,

Matthew Koop wrote:
> Mark,
> 
> It depends on what device you are using. For the OpenFabrics/Gen2 device,
> that parameter is not available since it is no longer needed. The library
> automatically limits resources according to job size as required. Other
> scalability features such as SRQ and on-demand connection setup remove
> the need for that variable.
> 
> We'll update that entry in the user guide to make it apparent that
> variable is only used in the VAPI device.
> 
> For any of the variables, they can be set either in the mvapich.conf file
> or specified at runtime. e.g.
> 
> mpirun_rsh -np 2 m0 m1 VIADEV_USE_SHARED_MEM=0 ./a.out
> 
> Let us know if you have any other questions or if this didn't help.
> 
> Thanks,
> 
> Matt
> 
> On Wed, 27 Jun 2007, Mark Potts wrote:
> 
>> Hi,
>>     I see a description of an attractive MVAPICH parameter in the 0.9.9
>>     User Guide: VIADEV_CLUSTER_SIZE with possible values of SMALL,
>>     MEDIUM, LARGE, and AUTO.  There is no matching default for this
>>     parameter contained in the mvapich.conf file.
>>
>>     Is this parameter truly implemented, as an app run time parameter,
>>     in MVAPICH 0.9.9 and if so how/where does its default value get
>>     assigned?
>>
>>              regards,
>> --
>> ***********************************
>>  >> Mark J. Potts, PhD
>>  >>
>>  >> HPC Applications Inc.
>>  >> phone: 410-992-8360 Bus
>>  >>        410-313-9318 Home
>>  >>        443-418-4375 Cell
>>  >> email: potts at hpcapplications.com
>>  >>        potts at excray.com
>> ***********************************
>> _______________________________________________
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>>

-- 
***********************************
 >> Mark J. Potts, PhD
 >>
 >> HPC Applications Inc.
 >> phone: 410-992-8360 Bus
 >>        410-313-9318 Home
 >>        443-418-4375 Cell
 >> email: potts at hpcapplications.com
 >>        potts at excray.com
***********************************