Groan.
It turns out Windows' support for >64 cores is funky, as usual.
A host's cores are divided into "processor groups" of at most 64 each
(presumably because of 64-bit bitmaps for affinity etc.).
Calls like GetSystemInfo() return info only about the calling
process's processor group.
Supporting > 64 cores on windows will involve:
1) enumerating the processor groups and adding up the
# of cores in each group
(Rom, please look into this)
2) The client will need to keep track of which processor group
each task is running in,
and explicitly set the group for new tasks.
In addition, if parallel applications want to use > 64 cores,
they will have to do something similar when creating threads.
-- David
On 10-Mar-2011 3:12 AM, TarotApprentice wrote:
> Hi David,
>
> It seems suspicious that it shows 60 when he has 160 cores. I presume it
> can display a 3 digit number in the number of cpus and the logging. For that
> matter what about the slot directory numbers are they able to create 3 digit
> folder names? It might be that it does indeed recognise the 160 cores but can
> only display 2 digits.
>
> Just a thought.
>
> MarkJ
>
>
>
> ----- Original Message ----
>> From: David Anderson<[email protected]>
>> To: TarotApprentice<[email protected]>
>> Sent: Thu, 10 March, 2011 7:04:45 AM
>> Subject: Re: [boinc_alpha] BOINC # cores limit?
>>
>>
>>
>> On 09-Mar-2011 2:36 AM, TarotApprentice wrote:
>>> There is this message thread going on Seti, where the user in question has a
>> 160
>>> core system, however BOINC would appear to only recognise 60 cores. Is there
>> a
>>> 60 cpu limit within BOINC?
>>
>> There's not limit AFAIK.
>>
>> -- David
>>
>
>
>
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