[quote]I think it was mostly speedups in stage 2.[/quote]

Will B2 change (when not specified and considering constant B1)?
I think Bob said/proved(?) it is optimal for both stages to take about equal time...

Oops, another reply I forgot! :( Sorry.

Actually, it looks as if we'll just leave the default B2 the same. We did some experimenting and the default usually gave close to optimal expected time to find factors. The optimal B2/B1 ratio depends on all sorts of things, such as type of cpu, size of input number (far more O(n) operations in stage 2) and type of number (base-2 much faster in stage 1). Anyone who wants to squeeze the last drop of performance out of ecm can do so relatively comfortably by trying different parameters now that gmp-ecm prints expected times to find factors. And the old default B2 still looks good for typical jobs.

Alex

I've done the required 2440 curves with ECM 6 for those not done to the 40 digit level. I'll do P+1 and P-1 at B1=1e10 and then start ECM at B1=11e6 for all except 12,239- and 12,297-.

P-1 crashed due to a memory issue. I have 2 GB RAM, which I thought should be enough. I am using bash on OS X, so I will try to increase the limits and see if that helps.

BTW, I have not reported my curves to anybody.

I finished P-1 at 1e10 (using -k 20). I will start P+1 at 1e10 after I return from vacation.