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Subject: Re: Cray

Author: Jeremiah Penery

Date: 16:21:52 07/09/03

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On July 09, 2003 at 08:25:39, Vincent Diepeveen wrote:

>Nevertheless this machine is record breaking and always will be remembered for
>that. Assuming it is designed for big vectors it's quite a bit slower in latency
>then because if you optimize for huge transfers at once then a single transfer
>is probably very pricey.
>
>So let's ignore the latency question, it wasn't designed for it simply.

Instead of just guessing, why don't you go look it up.  Information is widely
available.

Here - http://www.sc.doe.gov/ascr/dongarra.pdf - the MPI_PUT latency is listed
as 6.63us.  Everywhere else I've seen lists under 10us, with most being much
closer to 5us.



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