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From: Brock Palen (brockp_at_[hidden])
Date: 2006-12-11 14:52:40


On Dec 11, 2006, at 2:45 PM, Reese Faucette wrote:

>> Also I have no idea what the memory window question is, i will
>> look it up on google.
>>
>> aon075:~ root# dmesg | grep GM
>> GM: gm_register_memory will be able to lock 96000 pages (375 MBytes)
>
> This just answered it - there is 375MB available for GM to
> register, which
> is the IOMMU window size available to the GM driver. This is quite
> small,
> and it would be very helpful if this could be increased. helpful
> == much
> better performance for your jobs.
Always a plus

>
> It's possible that OMPI is not managing registered space well, as is
> required when the aggregate registered memory needed by a job is
> larger than
> the memory available to be registered. I do some research locally
> into
> OMPIs management of registered memory when using GM. If it comes
> to it,
> would you be willing to run an OMPI with some debug statements in
> it for me?
> thanks,
Sure i can run them.

> -reese
>
>
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