[mvapich-discuss] apparent error

[Abhinav Vishnu]

Hi Mark,

Thanks for your mail. 

> Hi,
>    I've noticed that in the MVAPICH 0.9.9 package included with OFED 1.2
>    the source file mpid/ch_gen2_multirail/vbuf.h contains the following
>    at line 51:
>       #define VBUF_TOTAL_SIZE   (1024*16)
>    However, all the similar code examples in this and related files
>    indicates the intention was to assume _SMALL_CLUSTER when the cluster
>    size is not specified.  Thus, I believe line 51 should be:
>       #define VBUF_TOTAL_SIZE   (1024*12)
> 
>    I have _not_ encountered a problem as a result of this apparent
>    error, but it seems worthy of correcting.

We chose this value after rigorous analysis of performance with
multi-rail device on our clusters. As you have mentioned, this
is definitely not a problem. Please let us know if you have some
data, which shows otherwise. We will be happy to take a look at it.

Thanks and best regards,

:- Abhinav

> 
>         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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