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Old 2022-06-14, 05:46   #67
ATH
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This works for P-1 and P+1 I tested long ago on composite numbers I constructed. I *think* it works for ECM as well, please correct me if that is not the case:

You can run stage2 in many stages or even random segments. For example if you run stage 1 with B1=1e6 and save it to a file, you can resume from that file and run any stage2 range you fancy. For example B2=3e13-4e13 and if you are super lucky that the largest factor of P-1 / P+1 (or the elliptic curve in case of ECM) is in that range, then you will find the factor, even though you did not run any stage2 from 1e6 to 3e13.

This is more useful for P-1 / P+1 than for ECM, since there is only 1 P-1 run needed or only a few runs needed with P+1 (50% chance for each run). For ECM where you have only a tiny chance for each curve it is probably not very useful to spend a lot of time on each curve messing around with a lot of different stage2 segments.

Last fiddled with by ATH on 2022-06-14 at 05:47
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Old 2022-06-15, 12:33   #68
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Quote:
Originally Posted by Gordon View Post
Doubt that it's hardware, the machine has 4 x 16Gb sticks in, and gmp-ecm is the ONLY software that blows up when requesting more memory...
What happens when you boot from a "live" Linux ISO and use gmp-ecm in a Linux environment?

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Old 2022-06-15, 13:19   #69
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Quote:
Originally Posted by Xyzzy View Post
What happens when you boot from a "live" Linux ISO and use gmp-ecm in a Linux environment?

Dunno, but to summarize a PM conversation with Gordon, after I was able to run gmp-ecm with memory usage > 19G on Win7 (both stages on gmp-ecm), Gordon was able to on his system too, so it may depend on details of how gmp-ecm is run, and more testing is planned. (I haven't tried the prime95 stage 1 / gmp-ecm stage 2 sequence that gave the issue originally seen by Gordon on Win7.) The issue may appear when specifying B2, or splitting the stages to two different softwares, or both.
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