On Fri, 20 Aug 2004 12:22:42 GMT, "Hurrah" <hurrah@not.here> wrote:

"f/f george" <george@yourplace.com> wrote in message
news:matai0151mltraps50mkcili0oj37b3acd@4ax.com...

Okay I will try and help with the affinity box.....Mike Ober is the
person that knows EXACTLY which processor to use it on and which not
to but.....if you use it and the processing slows down ALOT then the
box should not be checked/ticked. Basically what happens is the
processor runs out of memory and your processing slows down. This
happens because you have selected the affinity box and that ties that
unit to that processor. I believe that AMD's should NOT have the box
checked/ticked and Intel's should, but Mike can answer definitively.

Hi,

I checked the SETI Driver website and there is nothing there to fully
explain this function. (http://www.wakeassoc.com/setidriver/)

Would be nice if "Mike" could do a list of which CPU's to use the "set
processor affinity" switch to "ON" (assuming it is important - else why
would there be a facility in the first place??).

H.

It was discussed eons ago here in the group, I did not have a dualie
then so didn't pay too much attention but....I seem to remember that a
processor that can be split into 2 processors like the Intel Hyper
Threading and the AMD Opterons use memory differently than when there
is no Opteron or HT available. The difference, I think,  is how the
processor locks memory to the cpu when you choose the affinity box.
They both lock memory but the AMD will only use that locked memory and
not go out to whatever is left over and will run out of available
memory to swap the processing into. The Intel seems to be able to do
that. Meaning that the AMD will lock say 512k of memory to the "real
side" Opteron and 512k to the "non-real" side of the chip. When Seti
then asks for more memory it cannot get it so the processing has to
swap to the hard drive making the crunching slower. Intel, I think,
handles this better and does not need to swap out so the affinity box
can be checked.