Subject: Re: one MB and two MB L2 cache processors
From: f/f george
Date: 08/10/2004, 11:31
Newsgroups: alt.sci.seti

On Fri, 08 Oct 2004 10:18:18 GMT, "Hurrah" <hurrah@not.here> wrote:


I don't see where you disagreed? You are running 4 processes, two on
each of two different processors and each processor with 1 meg L2
cache. That makes 4 processes four your machine.


f/f george.

Please do the math on this.

I have 2 CPU's *EACH* of which crunch a single WU in 6 hours+. (Known fact -
that was what I got *before* installing SETI driver).

So, each CPU does 4 WU (average) a day. Therefore 2 CPU's do 8 WU a day.
Which is what I get. !!



But your implication is that each CPU with 1Mb cache can do 2 WU's
(processes) at once. So, instead of 4 WU per day, each CPU would do 8
(assuming 100% perfect world, which it isn't !!)

So a dual CPU with 4 processes should do 16 WU a day.

But I only get (at most) 8.


That's whay I disagreed

Can you advise me further?

H.
Sure, up the numbers in SetiDriver to reflect 1 unit for each 512 meg
of ram. If you have 2 cpus you can do 2 at one time. If each cpu has
an L2 cache of 1 meg you can do 4 at 1 time. If each cpu has an L2
cache of 2 meg than each cpu can do 4 at 1 time.
This is set in the setting "maximum processes". You MUST also have at
least that number of units in your "desired cache size" also. It is
preferred to have double the number of currently running units in the
"desired cache size".

The key is the L2 cache size, if you only have 512 meg than you are
limited to only running one unit per cpu. If you have 1 meg of L2
cache than you can double it to 2 per cpu at one time. If you have 2
meg of L2 cache, per cpu, than you can run 4 units at one time per
cpu. You MUST be running the CLI version for this to work too. The
Screen Saver version will not do this.