Links to Precompiled GMP-ECM versions

[swellman]

If you’re using Windows, see this post. Jeff Gilchrist’s site has several older versions of many of the general factoring tools. It will at least get you started.

If you’re using Linux, see EdH’s excellent “how to” folder, which tells you how to locate, download and compile the various tools.

[ThomRuley]

I just went there and his download links appear to be acting up today.

-- Has anybody heard from Jeff Gilchrist lately to ask him about that?
-- Would yafu be a reasonable alternative to the alpertron site for ECM?

[ThomRuley]

I just downloaded yafu and it's a big improvement over alpertron for speed. It should work pretty well for now.

Thanks

[RichD]

Originally Posted by ThomRuley

I just downloaded yafu and it's a big improvement over alpertron for speed. It should work pretty well for now.

Yes yafu has many options. Browse the ReadMe file.
- it is multi-thread, even for ECM, see -threads
- it can do only ECM work, I think -ecmonly
- if you know a number has previous work done and you want to start at a higher "t" level, see -work
- for smaller numbers you can go all the way through SIQS or NFS by stating "factor(n)", or start at "siqs(n)" or "nfs(n)"
(Maybe single quotes on a Windows box.)
(For NFS you will also need the sievers installed - like numbers above 95 digits.)