how to get cudaLucas work for large exponent?

[fairsky]

For example, I had a few jobs which are large exponents, such as 444xxxxxx from 78bit.

If I use fft length automatically from the option

FFTLength=0

in setting file, the tesla cannot work but pop out the error

over specifications Grid = 98304

Have you encountered this error before? How to get it work, any idea?

[owftheevil]

Try using Threads=512 in the ini file.

[fairsky]

Originally Posted by owftheevil

Try using Threads=512 in the ini file.

Thank you for the suggestion, but I tried even from 32 to 1024, for exponent 4xxxxxxxx.

And even for exponent 322xxxxxx with depth=76 or above I will also fail to run the cudaLucas ...

[Robish]

Originally Posted by fairsky

For example, I had a few jobs which are large exponents, such as 444xxxxxx from 78bit.

If I use fft length automatically from the option

in setting file, the tesla cannot work but pop out the error


Have you encountered this error before? How to get it work, any idea?

I use Cudalucas.x.x.x.x -threads 512 -f 20971520 -t 332xxxxxx.

However my exponents are smaller than yours so -f may need to increase, 20971520 = 1024 * 20480. So multiples of 1024. I dont fully understand it, but I would try 1024 * 3072 = 31457280 if 20971520 doesnt work.

LaurV explained it but I never got a chance to study it yet.

http://www.mersenneforum.org/showpos...&postcount=236

Hope this helps

Cheers

Rob.

[Robish]

Originally Posted by Robish

I use Cudalucas.x.x.x.x -threads 512 -f 20971520 -t 332xxxxxx.

However my exponents are smaller than yours so -f may need to increase, 20971520 = 1024 * 20480. So multiples of 1024. I dont fully understand it, but I would try 1024 * 3072 = 31457280 if 20971520 doesnt work.

LaurV explained it but I never got a chance to study it yet.

http://www.mersenneforum.org/showpos...&postcount=236

Hope this helps

Cheers

Rob.

Be warned, Im using GTX690's and 332xxxxxx takes 4500 hours or 190 days to run, hope your not in a hurry, :-P

[Manpowre]

Originally Posted by Robish

Be warned, Im using GTX690's and 332xxxxxx takes 4500 hours or 190 days to run, hope your not in a hurry, :-P

really 4500 hours ? LOL..