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Old 2004-05-25, 08:11   #1
jugbugs
 
Mar 2004
Fort Collins, CO

168 Posts
Default Question about Primenet

I have been looking at this feild:

Account ID----LL P90*--Exponents--Fact.P90-- Exponents --P90 CPU
--------------CPU yrs--LL Tested--CPU yrs*--w/ Factor--hrs/day
-------------- ------- --------- -------- --------- -------
Blahblah --------0.000 ----- 0 ----0.143 ---- 0 ----- 18.42


In particualar the P90 CPU hrs/day part. I have a p4 2.8 and a 500mhz k6. Before starting up the k6 I was at ~20 P90 CPU hrs a day.. now it seems it drops a little everyday. Why is this and how does primenet compute this.

Thanks in Advance!

Last fiddled with by jugbugs on 2004-05-25 at 08:14
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Old 2004-05-25, 09:49   #2
lycorn
 
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"GIMFS"
Sep 2002
Oeiras, Portugal

1,567 Posts
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It will continue to drop until you submit a result.
Your credit is constantly being divided by the time elapsed since you joined GIMPS. Whenever you submit a result, your credit goes up, and so does the CPU hrs/day. You will see it when you submit your next result. Be patient ...
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Old 2004-05-25, 10:26   #3
jugbugs
 
Mar 2004
Fort Collins, CO

E16 Posts
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Thank you very much...

Now, how is the p90 result calculated. Is is based on a 90Mhz computer?

So for a 2.8 GHz running 24hrs /day i should get:

2800/90 = 31.1... *24 = 746.4

that right or not?
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Old 2004-05-25, 11:04   #4
lycorn
 
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Sep 2002
Oeiras, Portugal

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Your calculation would be correct if the P4 were as efficient as the P90. But fortunately, thanks to the improvements in the architecture, instruction set and to the expertise of George Woltman, who managed to squeeze a lot of power from the SSE2 capabilities of the processor, a Pentium 4 is a LOT more efficient than the old Pentium was. From my experience in running GIMPS, I would say that a P4 2.8G shall be around 80 to 85 times faster at LL testing than a Pentium 90. That means 80*24 ~ 1920 CPU hrs/day. Your K6 shall be about 3 times faster than the Pentium 90, so your maximum throughput for the moment shall be 1920 + 3*24 ~2000 CPU hrs/day. Again, this is the optimal situation, when the CPU is running H24 and it is not being interrupted by other tasks (don´t forget that P95 runs at a very low priority). Also, remember that the time spent in TF is not accounted the same way than the time spent in LL or DC, so your actual figures will in principle be lower than this number.
HTH
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Old 2004-05-25, 11:19   #5
Maybeso
 
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Aug 2002
Portland, OR USA

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Aww lycorn, you posted while I was still typing. And drat, yours reads better than mine.
*del-del-del-del*

I joined several years ago with a slow machine thru work, then spent months blocked by a firewall.
When I reconnected with three 2.4 Ghz machines I hopped up the rankings like crazy.
But it took a while for the P90 CPU hrs/day to match the people I was passing because it was dividing my results by all the days since I first joined.
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Old 2004-05-27, 03:29   #6
jugbugs
 
Mar 2004
Fort Collins, CO

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thanks yall...
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