[mvapich-discuss] SDR & DDR selection in MVAPICH2-uDAPL compilation

[Lei Chai]

Hi Yogeshwar,

The selection is based on your IB card, whether it is SDR or DDR. Inside 
mvapich2-udapl code this information is used for parameter tuning. We 
have observed before that different parameter values are needed to yield 
best performance for these two kinds of cards.

On a separate topic, if you are using IB, we suggest you use the 
OpenFabrics interface in mvapich2, which provides the best performance, 
scalability, and fault tolerance.

Lei


yogeshwar sonawane wrote:
> Hi all,
>
> While compiling MVAPICH2 for udapl device, the selection menu asks for
> link speed.
> Two options are available :- SDR & DDR
> Generally these are the properties of the IB HCA.
>
> Now, on what things this selection is based on ?
> on IB HCA charactristics ? any other thing ?
> &
> In MVAPICH2-uDAPL code, how this selection matters ?
> OR How this selection is going to change the behaviour of MVAPICH2-uDAPL ?
>
> Thanks,
> Yogeshwar
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