Thread: Sr2sieve on PPC/Linux View Single Post
2007-02-07, 01:18   #93
jasong

"Jason Goatcher"
Mar 2005

1101101100112 Posts

Quote:
 Originally Posted by rogue This affects how deeply you can sieve (the value of p) not the k, b, or range of n for which you are sieving. In other words, unlikely. If the software sieved to a limit of 2^52 (which is extremely unlikely), it would probably terminate. I can't speak for certain on that. BTW, the reason for 2^52 was because that is a limit in the FPU. As the PPC version doesn't using the FPU, the limit is actually 2^63 (one bit less than the number of bits in a register).
I think there may have been some confusion on the part of BlisteringSheep. The values he gave looked more like n-values instead of sieving values. k and n values define WHAT you're sieving, or trying to find values for. The max 2^52 value determines how high a factor can be tested.

2^52 is 4.5*10^15, while 2^63(which is 2048 times bigger) is 9.22*10^18. To get a grasp of how big these numbers are, 2^52 seconds is a little under 143 million years. 2^63 seconds is about 292 billion years. Not that we're counting seconds with these numbers.