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Old 2022-06-29, 21:09   #1
Prime95
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Default ECM users - version 30.9?

I've been very slow at writing new code lately -- summertime I guess.

Is there interest in a pre-beta version of 30.9 that uses a GMP-ECM-like stage 2? It's been working and pretty stagnant for a month, but as with the 30.8 pre-beta there is a long way to go before it's ready for prime time.

Interestingly, in my limited testing it seems that, unlike P-1, B2 > ~1000 * B1 does not make sense. You are better off running more curves or increasing B1. In some situations, prime95 elects not to use all the available memory -- this will mean the default MaxHighMemWorkers setting might need to change.

BTW, the first and only success thusfar is here: 909107
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Old 2022-06-29, 22:20   #2
storm5510
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ECM has been my fallback for years. It's something I can start and leave running for day and not check on it.

I have used GMP-ECM a lot. My only issue with it is that it does not multi-thread. Other say it doesn't need to, run multiple instances instead. This is more than I want to keep up with.


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Old 2022-06-29, 22:22   #3
Denial140
 
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I would be interested in using it e.g. to speed up the ECM work on 2.22M-2.23M to take it to below 200 exponents unfactored.
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Old 2022-06-30, 00:34   #4
kriesel
 
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Quote:
Originally Posted by Prime95 View Post
Is there interest in a pre-beta version of 30.9 that uses a GMP-ECM-like stage 2? It's been working and pretty stagnant for a month, but as with the 30.8 pre-beta there is a long way to go before it's ready for prime time.
First reactions:
You know it. If you build it, users will come. Whatever the next new or improved feature is. Happens every time.
Really, we've become quite accustomed over the decades, to you finding more ways to wring even more out of available hardware. Thanks again.
Not needing the prime95/gmp-ecm shuffle or gmp-ecm alone would be convenient and welcome.
Personally I'd like to see handling proof files on the server for p > 596M get automated to conserve your time for such other creativity. (Maybe a single karatsuba implemented length just there. 64M words via 3 x 32M fft, leveraged from 596M up to 1G+ exponent for proof processing on server.) But as always, your time your call.
Handling the "I want to change the proof residues location midflight without manually stopping the program and moving the residues file beforehand" case would be nice and surely save some otherwise lost proofs. Save us mortal users from our own lack of foresight.
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Old 2022-06-30, 07:08   #5
lycorn
 
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Sep 2002
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Quote:
Originally Posted by Prime95 View Post
Is there interest in a pre-beta version of 30.9 that uses a GMP-ECM-like stage 2?
Count me in.
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Old 2022-06-30, 11:45   #6
Zhangrc
 
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May 2021
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I've seen SUMOUT errors occur when running ECM on very small exponents and cofactors. (M1277 for example)
I'm not trying to reproduce the error (I have more PRPs to do), and it seems that these errors are not recorded in the log.
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Old 2022-06-30, 12:06   #7
axn
 
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Quote:
Originally Posted by Prime95 View Post
Interestingly, in my limited testing it seems that, unlike P-1, B2 > ~1000 * B1 does not make sense. You are better off running more curves or increasing B1. In some situations, prime95 elects not to use all the available memory -- this will mean the default MaxHighMemWorkers setting might need to change.
Have you thrown a 100GB at the problem?

If I can get access to the pre-beta (with instructions, if any), I can do some high memory testing and report back on the behavior
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Old 2022-06-30, 15:00   #8
masser
 
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Quote:
Originally Posted by Prime95 View Post

Is there interest in a pre-beta version of 30.9 that uses a GMP-ECM-like stage 2? It's been working and pretty stagnant for a month, but as with the 30.8 pre-beta there is a long way to go before it's ready for prime time.
I will test it, too. Will this version also include P+1 with improved stage 2?
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Old 2022-07-01, 02:42   #9
Prime95
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Quote:
Originally Posted by masser View Post
I will test it, too. Will this version also include P+1 with improved stage 2?
P+1 is not improved.

I'll see if I can make a build sometime soon.
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Old 2022-07-03, 00:25   #10
Prime95
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30.9 build 1

If you aren't doing ECM, do not download! PRE-BETA software!

Save files during ECM stage 2 are broken (probably a crash)
Stage 2 time estimates and optimal B2 bounds could be off
Accurate estimates of stage 2 memory consumed may be off
Further stage 2 multithreading improvements are needed.
Stage 2 is pretty verbose, there's lots of code cleanup in my future.

Windows 64-bit: https://mersenne.org/ftp_root/gimps/p95v309b1.win64.zip
Linux 64-bit: https://mersenne.org/ftp_root/gimps/...linux64.tar.gz
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Old 2022-07-04, 07:31   #11
Glenn
 
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I’ve downloaded 30.9b1 but am continuing to use 30.8b15,
which is now “official” on the main Mersenne.org page.

I had a single round off error over 0.4 on a recent test for
M113782777, but successfully completed that test anyway.
Since then my tests (two more so far) include a “round off:”
column in my results for each group of 10,000 iterations.

Please let me know when it’s safe to use 30.9.
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