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Old 2018-11-07, 20:20   #5
petrw1
1976 Toyota Corona years forever!
 
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"Wayne"
Nov 2006
Saskatchewan, Canada

2·3·773 Posts
Default P-1 with 20GB is slower than 16GB

After a couple days at 20GB of RAM instead of 16GB I am seeing:

- 960 relative primes INSTEAD of 480 relative primes
- same GhzDays credit
- BUT it is not taking a little longer. With a total of 480 RPs stage 2 was taking almost exactly 1 minute per RP. i.e. if it was doing 60 RPs it took 60 minutes. But with a total of 960 RPs it is taking MORE THAN 2 minutes per RP. i.e. if it is doing 60 RPs it is taking about 135 minutes and so the entire P-1 is taking longer overall.

Seems odd that I am slowing down with MORE RAM.

NOTE a typical assignment is:

Code:
Pminus1=N/A,1,2,47299781,-1,1000000,20000000,73

Hold the presses...

After a more formal and official calculation it seems it made not enough difference to measure yet...

Last fiddled with by petrw1 on 2018-11-07 at 21:25 Reason: Hold the presses
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