mtsieve

[rogue]

Thanks.

[Happy5214]

Can you make it stop automatically once it prints out the q's when passing the -Q flag? Not having to worry about killing the sieve will make writing a script to orchestrate automated testing of q's easier.

[rogue]

Originally Posted by Happy5214

Can you make it stop automatically once it prints out the q's when passing the -Q flag? Not having to worry about killing the sieve will make writing a script to orchestrate automated testing of q's easier.

Try using -A and passing an empty factor file with -I. I think that would work.

[Happy5214]

Originally Posted by rogue

Try using -A and passing an empty factor file with -I. I think that would work.

It does not. The following invocation:

../../../bin/srsieve2cl -A -I /dev/null -i b2_n.boinc -Q

produces this:

srsieve2cl v1.6.6, a program to find factors of k*b^n+c numbers for fixed b and variable k and n
Read 0 factors from /dev/null which removed 0 terms.

Reading from /dev/null is an immediate EOF, and I also tested with an empty file in the same directory.

[rogue]

Create an empty file in the directory. Use that with -I.

[Happy5214]

Originally Posted by Happy5214

It does not. The following invocation:

../../../bin/srsieve2cl -A -I /dev/null -i b2_n.boinc -Q

produces this:

srsieve2cl v1.6.6, a program to find factors of k*b^n+c numbers for fixed b and variable k and n
Read 0 factors from /dev/null which removed 0 terms.

Reading from /dev/null is an immediate EOF, and I also tested with an empty file in the same directory.

Originally Posted by rogue

Create an empty file in the directory. Use that with -I.

Please re-read my post. This was the aforementioned second run with the file in the same directory:

$ ../../../bin/srsieve2cl -A -I blank_file -i b2_n.boinc -Q
srsieve2cl v1.6.6, a program to find factors of k*b^n+c numbers for fixed b and variable k and n
Read 0 factors from blank_file which removed 0 terms.

[rogue]

So the use of -A and -I doesn't work.

How about this?

srieve2cl -ifile.abcd -p1000000 -P1000100 -ofile.temp -Q

You can throw out file.temp after running this.

[Happy5214]

Originally Posted by rogue

So the use of -A and -I doesn't work.

How about this?

srieve2cl -ifile.abcd -p1000000 -P1000100 -ofile.temp -Q

You can throw out file.temp after running this.

The file is sieved to 1T already, but experimentation shows that the -P doesn't really matter much:

$ ../../../bin/srsieve2cl -i b2_n.boinc -P 5 -o /dev/null -Q  
srsieve2cl v1.6.6, a program to find factors of k*b^n+c numbers for fixed b and variable k and n
Must use generic sieving logic because -l was not specified for mutiple sequences
Sieving with generic logic for p >= 1000000000000
q =    2 with       5 subseq yields bs =  1116, gs =   224, work =     2239
a bunch more q's
q =    1 with       5 subseq yields bs =  1582, gs =   316, work =     3164
Split 5 base 2 sequences into 18 base 2^72 sequences.
Fatal Error:  pmin must be less than pmax

Again, note the use of /dev/null to toss the output (and the bolded typo).

I can work with this now. Another question I had is about the interplay between -q and -g. Is the best q (by speed, not score) going to be the fastest regardless of the value chosen for -g, allowing me to check for q, fix it, and check the -g values; or do I have to check all (reasonable) q/-g combinations within that 20% q score threshold, sort of like a 2×2 matrix?

[rogue]

Some settings of -q will allow you to increase -g others will require you to decrease -g as -q can impact how much memory is needed by each kernel.

[ryanp]

Another bug in srsieve2?

$ ./srsieve2 -P 4e14 -o out.txt -W 32 -s "11*2^n+1" -n 15e6 -N 25e6
srsieve2 v1.6.6, a program to find factors of k*b^n+c numbers for fixed b and variable k and n
Sieving with generic logic for p >= 3
Sieve started: 3 < p < 4e14 with 10000001 terms (15000000 < n < 25000000, k*2^n+1) (expecting 9673251 factors)
Sieving with single sequence c=1 logic for p >= 257
BASE_MULTIPLE = 30, POWER_RESIDUE_LCM = 720, LIMIT_BASE = 720
Fatal Error:  Expected 15 subsequences but 233 were created

[storm5510]

I awakened very early this morning to find the latest srsieve2cl has caused a reboot. Not sure why. It may be in the system logs. I haven't looked yet.