Prime95, v25.5, ECM, error on non base2

Jay · 2007-12-28, 03:21

Version 25.5

ContinueECM=1

ECM2=1,3,4096,1,2000,0,9

[Main thread Dec 27 19:03] Mersenne number primality test program version 25.5

[Main thread Dec 27 19:03] Starting worker thread.
[Work thread Dec 27 19:03] Work thread starting
[Work thread Dec 27 19:03] Using generic reduction FFT length 640
[Work thread Dec 27 19:03] ECM on 3^4096+1: curve #1 with s=7359417470999745, B1=2000, B2=200000
[Work thread Dec 27 19:03] 3^4096+1 has a factor: 2
[Work thread Dec 27 19:03] ECM on 3^4096+1: curve #1 with s=5740293094245417, B1=2000, B2=200000
[Work thread Dec 27 19:03] Stage 1 complete. 151721 transforms, 1 modular inverses. Time: 0.769 sec.
[Work thread Dec 27 19:03] Using 3MB of memory in stage 2.
[Work thread Dec 27 19:03] Stage 2 init complete. 10959 transforms, 1 modular inverses. Time: 0.069 sec.

After finishing stage-1 it begins stage-2. After 16 minutes, it is still working on stage-2. Memory usage has very slowly crept up and is at 9,724K after 12 minutes.

Note that the older v24.14 that I've been using has had major problems with non base2 stage-2 ECM work. Usually it gets into stage-2 and then terminates. Termination is either with invalid memory access, or with a SUMOUT error.

Jay · 2007-12-28, 04:04

I just tried v25.6 build-3 with the same results. Starts stage-2, but never finishes.

Prime95 · 2007-12-28, 14:04

I'm looking into it

Prime95 · 2007-12-30, 09:58

Fixed in 25.6 build 5. Download the "c" version of 25.6 to test it.

Jay · 2007-12-30, 16:32

Quote:

Originally Posted by Prime95

Fixed in 25.6 build 5. Download the "c" version of 25.6 to test it.

Brief examination shows the original problem as being fixed. Thank you for the quick turn-around.

I'll run through some additional ECM testing for things that had issues in the past. But I'm hoping that your fix will encompass them all.

Will you be releasing source again? I will need to retool it again so as to add a fork to GmpEcm stage-2 work.

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2007-12-28, 03:21	#1
Jay Dec 2007 22₁₆ Posts	Prime95, v25.5, ECM, error on non base2 Version 25.5 ContinueECM=1 ECM2=1,3,4096,1,2000,0,9 [Main thread Dec 27 19:03] Mersenne number primality test program version 25.5 [Main thread Dec 27 19:03] Starting worker thread. [Work thread Dec 27 19:03] Work thread starting [Work thread Dec 27 19:03] Using generic reduction FFT length 640 [Work thread Dec 27 19:03] ECM on 3^4096+1: curve #1 with s=7359417470999745, B1=2000, B2=200000 [Work thread Dec 27 19:03] 3^4096+1 has a factor: 2 [Work thread Dec 27 19:03] ECM on 3^4096+1: curve #1 with s=5740293094245417, B1=2000, B2=200000 [Work thread Dec 27 19:03] Stage 1 complete. 151721 transforms, 1 modular inverses. Time: 0.769 sec. [Work thread Dec 27 19:03] Using 3MB of memory in stage 2. [Work thread Dec 27 19:03] Stage 2 init complete. 10959 transforms, 1 modular inverses. Time: 0.069 sec. After finishing stage-1 it begins stage-2. After 16 minutes, it is still working on stage-2. Memory usage has very slowly crept up and is at 9,724K after 12 minutes. Note that the older v24.14 that I've been using has had major problems with non base2 stage-2 ECM work. Usually it gets into stage-2 and then terminates. Termination is either with invalid memory access, or with a SUMOUT error.

2007-12-28, 04:04	#2
Jay Dec 2007 2×17 Posts	I just tried v25.6 build-3 with the same results. Starts stage-2, but never finishes.

2007-12-28, 14:04	#3
Prime95 P90 years forever! Aug 2002 Yeehaw, FL 19×397 Posts	I'm looking into it

2007-12-30, 09:58	#4
Prime95 P90 years forever! Aug 2002 Yeehaw, FL 7543₁₀ Posts	Fixed in 25.6 build 5. Download the "c" version of 25.6 to test it.