[Beowulf] gigabit ethernet: horrible performance for 0 byte messages

[John Hearns]

On Wed, 11 Feb 2004, Bernhard Wegner wrote:

> 
> Does anyone have any idea?
> 
> Here are the details of my system: 
>  - Suse Linux 9.0 (kernel 2.4.21)
>  - mpich-1.2.5.2
>  - motherboard ASUS P4P800
>  - LAN (10/100/1000) on board (3COM 3C940 chipset)
>  - LevelOne 10/100/1000 8-port Fast Ethernet Switch (chipset: TC9208M +
>    8x88E1111-BAB, AT89C2051-24PI)

You might look at the P4_GLOBMEMSIZE parameter in the MPI job.

export P4_GLOBMEMSIZE=20194344      (say)

Try stepping through various values for this parameter,
and run the Pallas benchmark.
Let us know what the results are!


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