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From: George Bosilca (bosilca_at_[hidden])
Date: 2007-08-13 11:33:09


On Aug 13, 2007, at 11:28 AM, Pavel Shamis (Pasha) wrote:

> Jeff Squyres wrote:
>> I guess reading the graph that Pasha sent is difficult; Pasha -- can
>> you send the actual numbers?
>>
> Ok here is the numbers on my machines:
> 0 bytes
> mvapich with header caching: 1.56
> mvapich without header caching: 1.79
> ompi 1.2: 1.59
>
> So on zero bytes ompi not so bad. Also we can see that header caching
> decrease the mvapich latency on 0.23
>
> 1 bytes
> mvapich with header caching: 1.58
> mvapich without header caching: 1.83
> ompi 1.2: 1.73
>
> And here ompi make some latency jump.
>
> In mvapich the header caching decrease the header size from 56bytes to
> 12bytes.
> What is the header size (pml + btl) in ompi ?

The match header size is 16 bytes, so it looks like ours is already
optimized ...

   george.

>
> Pasha
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