[mvapich-discuss] During intra-node pingpong test, why bandwidth lowers when message size heightens?

[Lei Chai]

Hi,

I believe it only gets lower when the message size is very large, like a
few MB. That is because the buffers are out of cache for very large
messages and the bandwidth becomes lower.

Lei


Áõ־ǿ wrote:
> When I made a intra-node pingpong test in a SMP with MVAPICH2 1.0.3
> and NetPipe, I found that the bandwidth lowers when messagesize heightens.
> Why? Hope to get an answer.
>
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