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From: Galen Shipman (gshipman_at_[hidden])
Date: 2007-08-13 12:34:24


>>>>
>>> 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

Is this just convertor initialization cost?

- Galen

>>>
>>> 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 ...
> So for 0 bytes message we are sending only 16bytes on the wire , is it
> correct ?
>
>
> Pasha.
>>
>> george.
>>
>>>
>>> Pasha
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>>
>>
>
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