[mpich-discuss] Scalability of Intel quad core (Harpertown) cluster

[Hee Il Kim]

Hi,

mpi_pong test reuslts show that out gigabit network has

Max rate = 115.335908 MB/sec  Min latency = 49.948692 usec

I ran it several times and got almost the same results. Unfortunately I
could not analyse more and the reuslt was attached to this mail.

Hee Il

2008/3/29, Elvedin Trnjanin <trnja001 at umn.edu>:
>
> You would do that within the code. If you're trying to pass every
> element of an int array one at a time (message size is sizeof(int)), it
> will have much worse performance than sending the entire array (message
> size is sizeof(int)*arraydimensions.
>
> Example -
> http://www.scl.ameslab.gov/Projects/mpi_introduction/figs/mpi_pong.c
> This is a start for a decent approximation of network bandwidth and
> latency for a certain message size. Although not accurate, it'll
> certainly give you an idea of your network's performance with various
> message sizes and transfer types. It only works on two nodes at a time
> however so other types of communication like AlltoAll are not tested.
>
>
> Hee Il Kim wrote:
> >
> > I checked the bandwidth behavior mentioned by Elvedin. Could I change
> > or setup the message size and frequency in a runtime level or any
> > other steps?
> >
>
>
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