Interim iterations in status.txt are not random

GP2 · 2003-10-28, 21:56

The status.txt file shows how many iterations have been done for each exponent that is being LL-tested (or blank if LL-testing hasn't started yet).

The number of iterations is shown as a decimal number. But if converted to hexadecimal, an interesting pattern emerges: many of the iteration count end in 3F, 7F, BF, FF or 40, 80, C0, 00 or 01, 81.

For instance:

10000363,D ,65,5181823,66.6,6.4,60.4,28-Oct-03 02:57,23-Aug-03 01:05,Team_Prime_Rib,Reboot_It201

Here 5181823 = 4F117F (hex)

This only applies to LL-testing iteration counts. For factoring, the "iteration count" is an integer from 1 to 16 (or blank).

Here are the frequency counts for the top 16 values for the last two hexadecimal digits of the LL-testing iteration count in status.txt (Oct 28 2003 16:00 UTC):

Code:

GP2 · 2003-10-28, 21:59

If examining the final four hexadecimal digits, there is a preference for 0000, ffff, and to a lesser extent 0001:

Code:

garo · 2003-10-28, 22:51

That is primarily because Prime95 performs a number of checks - including whether to communicate with the server - every 65536 iterations.

2003-10-28, 21:56	#1
GP2 Sep 2003 2²×647 Posts	Interim iterations in status.txt are not random The status.txt file shows how many iterations have been done for each exponent that is being LL-tested (or blank if LL-testing hasn't started yet). The number of iterations is shown as a decimal number. But if converted to hexadecimal, an interesting pattern emerges: many of the iteration count end in 3F, 7F, BF, FF or 40, 80, C0, 00 or 01, 81. For instance: 10000363,D ,65,5181823,66.6,6.4,60.4,28-Oct-03 02:57,23-Aug-03 01:05,Team_Prime_Rib,Reboot_It201 Here 5181823 = 4F117F (hex) This only applies to LL-testing iteration counts. For factoring, the "iteration count" is an integer from 1 to 16 (or blank). Here are the frequency counts for the top 16 values for the last two hexadecimal digits of the LL-testing iteration count in status.txt (Oct 28 2003 16:00 UTC): Code: 1822 00 1704 ff 1107 40 1074 c0 1058 80 1050 7f 1037 3f 1022 bf 615 01 386 81 33 36 32 7d 29 f4 29 a6 28 95 28 8e 28 70 28 54 28 22 28 16 28 13

2003-10-28, 21:59	#2
GP2 Sep 2003 101000011100₂ Posts	If examining the final four hexadecimal digits, there is a preference for 0000, ffff, and to a lesser extent 0001: Code: 721 ffff 712 0000 232 0001 21 0040 20 003f 14 0c3f 13 e580 13 0081

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2003-10-28, 22:51	#3
garo Aug 2002 Termonfeckin, IE 2763₁₀ Posts	That is primarily because Prime95 performs a number of checks - including whether to communicate with the server - every 65536 iterations.