gcc build / test times on multi-core hosts?

[Joern RENNECKE]

H. J. Lu wrote:

>On Mon, Feb 20, 2006 at 07:30:41PM +0000, Joern RENNECKE wrote:
>  
>
>>the bottleneck of a shared memory bus, but the operating system must 
>>allocate
>>most memory locally to each CPU to avoid a bottleneck in the cross-connect
>>of the processors.
>>
>>    
>>
>
>Linux kernel 2.6.16-rc1 and above supports
>
>percpu_pagelist_fraction
>  
>
Is this per cpu (which might contain multiple cores) or per core?

>This is the fraction of pages at most (high mark pcp->high) in each zone that
>are allocated for each per cpu page list.  The min value for this is 8.  It
>means that we don't allow more than 1/8th of pages in each zone to be
>allocated in any single per_cpu_pagelist.
>
Do I understand this correctly that in a dual opteron single core system 
with 2 GB
memory, only up to 256 MB per processor could be specifically allocated 
in local
memory?
Whereas in an 8-way opteron machine with equal amounts of memory 
attached to each
processor, all the local memory could be allocated to its processor?