ECM question

Hi, I have a quadcore running ECM factoring and I always make 6 curves of the same exponent on all the 4 CPU but I haven't find a factor yet. I wanted to know if it's useful make 24 curves using only a CPU instead of what I'm doing. Thanks

[R.D. Silverman]

Originally Posted by Unregistered

Hi, I have a quadcore running ECM factoring and I always make 6 curves of the same exponent on all the 4 CPU but I haven't find a factor yet. I wanted to know if it's useful make 24 curves using only a CPU instead of what I'm doing. Thanks

What do you mean by "useful"?? 24 curves will give a higher probability
of success than 6.

I do not understand what you mean by "using only a CPU". Do you mean
"only using a single CPU"? Using more than one CPU allows one to run
more curves in a fixed amount of time.

Sorry, I wrote my question bad. I wanted to say 24 curves using one CPU instead of 6 curves per haed to the 4 CPU (a single ECM of 24 curves or 4 ECM of 6 curves). Thanks

[cheesehead]

Originally Posted by Unregistered

Sorry, I wrote my question bad. I wanted to say 24 curves using one CPU instead of 6 curves per haed to the 4 CPU (a single ECM of 24 curves or 4 ECM of 6 curves). Thanks

For results reported to GIMPS, it'll be the same either way.

24 curves are 24 curves (all with the same B1/B2, that is) regardless of how you divide them among your CPUs.

Do whichever is more convenient for you.

[R.D. Silverman]

Originally Posted by Unregistered

Sorry, I wrote my question bad. I wanted to say 24 curves using one CPU instead of 6 curves per haed to the 4 CPU (a single ECM of 24 curves or 4 ECM of 6 curves). Thanks

The probability of success will be the same in either case. One CPU
will take a bit longer