ECM users - version 30.9/30.10 (see post#168)

[ric]

Started testing 30.9 b1 on a couple of Colab instances on 13M PRP-CF exponents (10 curves, B1=50000, B2=15000000) and noticed soon a large <exp>.ftree file (~1.2GB) during stage 2 of each curve.

When stage 2 is completed, the <exp>.ftree file gets deleted and moved to the Trash folder - exhausting soon the 15GB space limit. Once proper debugging is done, would it be possible to truncate that file to zero- or minimal-length, prior to deletion?

[Prime95]

Originally Posted by ric

Started testing 30.9 b1 on a couple of Colab instances on 13M PRP-CF exponents (10 curves, B1=50000, B2=15000000) and noticed soon a large <exp>.ftree file (~1.2GB) during stage 2 of each curve.

When stage 2 is completed, the <exp>.ftree file gets deleted and moved to the Trash folder - exhausting soon the 15GB space limit. Once proper debugging is done, would it be possible to truncate that file to zero- or minimal-length, prior to deletion?

Good suggestion.

In the meantime, set EcmSaveFtreeToDisk=0 in prime.txt

[bayanne]

In amongst everything else would you be willing to upgrade mprime to 30.9 so I could run ECM, please ...

[kriesel]

George already has posted both Windows and Linux builds
at https://mersenneforum.org/showpost.p...4&postcount=10 in this thread, and pointed to by both
https://www.mersenneforum.org/showpo...35&postcount=1 (Announcements) and
https://www.mersenneforum.org/showpo...77&postcount=1 (prime95/mprime intro) in the reference info.

[bayanne]

Originally Posted by kriesel

George already has posted both Windows and Linux builds
at https://mersenneforum.org/showpost.p...4&postcount=10 in this thread, and pointed to by both
https://www.mersenneforum.org/showpo...35&postcount=1 (Announcements) and
https://www.mersenneforum.org/showpo...77&postcount=1 (prime95/mprime intro) in the reference info.

I just wondered about mprime which I use with a Mac

[James Heinrich]

Nothing specific to v30.9, problem has likely existed for a long time, but a user pointed out to me that Prime95 reports TF-F results incompletely:
{"status":"F", "exponent":512792989, "worktype":"TF", "factors":["10621798844143574859209"], (etc)

What's missing is bitlo, bithi, rangecomplete keys, it should look like this:

{"status":"F", "exponent":512792989, "worktype":"TF", "factors":["10621798844143574859209"], "bitlo":73, "bithi":74, "rangecomplete":false, (etc)

TF-NF results should still include the same 3 keys with "rangecomplete":true.

[congsz]

Does v30.9 mean faster ECM?
Personally, I'm quite determined to see if we can reach <200 unfactored exponents per 10K range for small exponents, and the first range with >=200 unfactored is 2.22M. But the P-1 bounds of 2.22M is high enough, and there is no need to re-P-1. (See this factoring effort page.)
So I am hoping if someone can help doing ECM in the range with the benefits from v30.9.

[Denial140]

Originally Posted by congsz

So I am hoping if someone can help doing ECM in the range with the benefits from v30.9.

I have occasionally been doing ECM in this range for a while - I have not submitted all my work yet, but I will soon have most exponents in the range to t25. If you wish to start towards t30 (i.e. B1=250000) on those already with t25 (see this report), I'd be happy to coordinate more on the t30 once I have finished off t25.

[Prime95]

Originally Posted by congsz

Does v30.9 mean faster ECM?

Yes.

[congsz]

Originally Posted by Denial140

I have occasionally been doing ECM in this range for a while - I have not submitted all my work yet, but I will soon have most exponents in the range to t25. If you wish to start towards t30 (i.e. B1=250000) on those already with t25 (see this report), I'd be happy to coordinate more on the t30 once I have finished off t25.

I am currently focused on my P-1 work, so I think I will only have a quick ECM try in ONE exponent during this few months. I pick M2222219, which has completed to t25. I will work on it until it reached at least t35.
I don't quite understand the mechanism of ECM. If I want to reach t35 on the exponent, should I pick B1=250000, complete 640 curves, and then pick B1=1000000 and complete 1566 curves? Or just choose B1=1000000 from the start of my work?
Another question: Is the ECM B2 in v30.9 determined automatically (like P-1 B2 in v30.8) or manually? If manually, how would I choose B2?

[Prime95]

Like P-1, prime95 ECM will choose B2 automatically. To simplify matters I'd just start with B1 = 1000000. Depending the B2 chosen by prime95 will determine the number of curves that need to be run. It will be much less than 1566.