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

[yogeshwar sonawane]

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