[mvapich-discuss] MVAPICH-1.0 Bandwidth drop with large window size

[Weikuan Yu]

Hi,

I noticed a bandwidth problem with MVAPICH-1.0 UD implementation. Using
osu_(bi)bw.c programs, if the window size is increased to 128 or above, the
bandwidth can be quite low. I would assume there is a congestion in some
queue processing. 

The difference should be readily reproducible. So I would not post the
details numbers here. Let me know if you have some parameters to tune it up
or need more info.

-- 
Weikuan Yu
http://ft.ornl.gov/~wyu/