GIMPS Credit for Exponents Between 79.3 Million and 596 Million

[jinydu]

Originally Posted by cheesehead

My data? Are you referring to the entries in the "[x]jmptable[p]" tables in Prime95 source module mult.asm?

Yes. Unfortunately, I don't know where the Prime95 source module mult.asm is.

Originally Posted by cheesehead

To which of the tables in http://www.mersenneforum.org/showthread.php?t=2731 are you referring?

The first one; post #8 by Joe_O.

So here is an interesting question. Right now, I have 367.584 CPU years of credit for CPU testing ( That figure hasn't budged since Oct. 27 ). How large would an exponent have to single-handedly be worth that much GIMPS credit?

[S485122]

On the first page of the GIMPS site you will see a link in the upper right corner : Source Code
On that page there is another link : download all the source code(3.6MB)

[jinydu]

Originally Posted by cheesehead

Look in Prime95 source module mult.asm at tables xjmptable and xjmptablep.

Some raw excerpts:

xjmptable DD 743, 32, 0.00000111, 896
...
allfft DD 68130000, 3670016, 0.323, 9456000
...
allfft DD 77910000, 4194304, 0.382, 5724160
...
allfft DD 96830000, 5242880, 0.485, 7045376
...
allfft DD 115300000, 6291456, 0.668, 8364416
...
allfft DD 134200000, 7340032, 0.886, 9683456
...


xjmptablep DD 739, 32, 0.00000111, 1152
...
allfft DD 58410000, 3145728, 0.289, 4143104
...
allfft DD 77700000, 4194304, 0.425, 5462016
...
DD 115000000, 6291456, 0.668, 9650176
...
DD 153100000, 8388608, 1.042, 12828672
...

I'll leave those to your interpretation. :-)

There are two tables under xjmptable. In each table, the first numerical column appears to be the maximum size of the exponent for that exponent to have that FFT size; the second numerical column is the FFT size. For some reason, the second table seems to be wrong; for instance, it seems to claim a FFT jump at p = 20M, when in fact no such jump exists.

For the first table (which seems to be correct), there seems to be a lot of near (but not exact) repetition for any given FFT range. As the numbers get larger, the table becomes increasingly repetitive. However, the indented text towards right does change a little with each repetition; I'm not sure what that means. There is a third number to the right of the FFT size that stays the same with each repetition of an FFT size; I don't know what it means either. For FFT size 6,291,456, that number is 0.668. It might have something to do with credit; but even if it does, whether or not Primenet awards credit in accordance with this chart is still an open question for me.

So if my guess is correct, the complete list of FFT ranges for version 24.14 are:

                       32
                    48
                   64
                   80
                   96
                    112
                   128
                    160
                   192
                   224
                   256
                   320
                   384
                   448
                   512
                  640
                  768
                  896
                  1024
                 1280
                  1536
                  1792
                 2048
                 2560
                  3072
                  3584
                 4096
                5120
                6144
                7168
                8192
                10240
                12288
                14336
                16384
               20480
                24576
                28672
                32768
                40960
                49152
               57344
              65536
              81920
              98304
              114688
              131072
              163840
              196608
              229376
              262144
              327680
              393216
              458752
             524288
            655360
             786432
            917504

Argh! After going through all that work, it appears that the above table is incorrect...

[jinydu]

StarQwest received 79.417 CPU years for testing M100,000,007. Does anyone know how to account for that figure?