[Beowulf] GPFS on Linux (x86)

Scott Atchley atchley at myri.com
Fri Sep 15 14:11:41 EDT 2006


On Sep 15, 2006, at 5:49 AM, Loic Tortay wrote:

> According to Patrick Geoffray:
>> Greg Lindahl wrote:
>>>> If, however, you are considering something faster than gigabit
>>>> Ethernet, bear in mind that GPFS only can use TCP (as far as I  
>>>> know).
>>>
>>> The July 2006 presentation posted to the list about the same time as
>>> your email says they're adding IB protocols in the future. I thought
>>> that GPFS used to support GM directly?
>>
>> Never did, AFAIK. For a while, I though it used UDP, but I was  
>> mistaken.
>>
> According to the documentation, GPFS supports GM directly.
>
> GPFS requires TCP so GPFS on Myrinet is probably not as efficient  
> as it
> could theoretically be.
>
> The GPFS documentation is available online, see for instance the
> "Planning and Installation Guide" in which Myrinet is mentionned a few
> times:
> <http://publib.boulder.ibm.com/infocenter/clresctr/vxrx/index.jsp? 
> topic=
> /com.ibm.cluster.gpfs.doc/gpfs31/bl1ins1146.html>.
>
>
> Loïc.

Hi Loïc,

I looked at the documents. It is using Ethernet emulation over GM:

"If GPFS is configured to operate over Myrinet, to enable the Jumbo  
Frames for Myrinet IP driver build the GM driver with the --enable- 
new-features."

It is not using the GM (or MX) API at all.

Scott

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